rfc9559.original.xml   rfc9559.xml 
<?xml version="1.0" encoding="utf-8"?> <?xml version="1.0" encoding="UTF-8"?>
<!-- name="GENERATOR" content="github.com/mmarkdown/mmark Mmark Markdown Process
or - mmark.miek.nl" --> <!DOCTYPE rfc [
<rfc version="3" ipr="trust200902" docName="draft-ietf-cellar-matroska-21" sortR <!ENTITY nbsp "&#160;">
efs="true" tocDepth="4" submissionType="IETF" category="std" xml:lang="en" xmlns <!ENTITY zwsp "&#8203;">
:xi="http://www.w3.org/2001/XInclude" indexInclude="true" consensus="true"> <!ENTITY nbhy "&#8209;">
<!ENTITY wj "&#8288;">
]>
<rfc version="3" ipr="trust200902" docName="draft-ietf-cellar-matroska-21" numbe
r="9559" submissionType="IETF" category="std" consensus="true" tocInclude="true"
sortRefs="true" symRefs="true" tocDepth="4" xml:lang="en" xmlns:xi="http://www.
w3.org/2001/XInclude" updates="8794" obsoletes="">
<!-- [rfced] We added "Updates: 8794" to the document header per the text in
the Abstract and Section 4.2. Please review and let us know any concerns.
-->
<!-- [cellar] It doesn't update 8794 in the sense it's not describing the same t
hings.
It only assumes some errata of 8794 are used to be fully compliant with EBML -->
<front> <front>
<title abbrev="Matroska Format">Matroska Media Container Format Specifications</ <title abbrev="Matroska Format">Matroska Media Container Format Specification<
title><seriesInfo value="draft-ietf-cellar-matroska-21" stream="IETF" status="st /title>
andard" name="Internet-Draft"></seriesInfo> <seriesInfo name="RFC" value="9559"/>
<author initials="S." surname="Lhomme" fullname="Steve Lhomme"><organization></o
rganization><address><postal><street></street>
</postal><email>slhomme@matroska.org</email>
</address></author><author initials="M." surname="Bunkus" fullname="Moritz Bunku
s"><organization></organization><address><postal><street></street>
</postal><email>moritz@bunkus.org</email>
</address></author><author initials="D." surname="Rice" fullname="Dave Rice"><or
ganization></organization><address><postal><street></street>
</postal><email>dave@dericed.com</email>
</address></author><date year="2023" month="October" day="22"></date>
<area>art</area>
<workgroup>CELLAR Group</workgroup>
<keyword>binary</keyword>
<keyword>storage</keyword>
<keyword>matroska</keyword>
<keyword>ebml</keyword>
<keyword>webm</keyword>
<author initials="S." surname="Lhomme" fullname="Steve Lhomme">
<organization></organization>
<address>
<postal>
<street></street>
</postal>
<email>slhomme@matroska.org</email>
</address>
</author>
<author initials="M." surname="Bunkus" fullname="Moritz Bunkus">
<organization></organization>
<address>
<postal>
<street></street>
</postal>
<email>moritz@bunkus.org</email>
</address>
</author>
<author initials="D." surname="Rice" fullname="Dave Rice">
<organization></organization>
<address>
<postal>
<street></street>
</postal>
<email>dave@dericed.com</email>
</address>
</author>
<date year="2024" month="May"/>
<area>art</area>
<workgroup>cellar</workgroup>
<keyword>binary</keyword>
<keyword>storage</keyword>
<keyword>matroska</keyword>
<keyword>ebml</keyword>
<keyword>webm</keyword>
<abstract> <abstract>
<t>This document defines the Matroska audiovisual data container structure, incl <t>This document defines the Matroska audiovisual data container structure,
uding definitions of its structural elements, including definitions of its structural elements, terminology,
as well as its terminology, vocabulary, and application.</t> vocabulary, and application.</t>
<t>This document updates <xref target="RFC8794"></xref> to permit the use of a p <t>This document updates RFC 8794 to permit the use of a previously reserved Ext
reviously reserved EBML Element ID.</t> ensible Binary Meta Language (EBML) Element ID.</t>
</abstract> </abstract>
</front> </front>
<middle> <middle>
<section anchor="introduction"><name>Introduction</name> <section anchor="introduction"><name>Introduction</name>
<t>Matroska is an audiovisual data container format. It was derived from a proje <t>Matroska is an audiovisual data container format. It was derived from a
ct called <xref target="MCF"></xref>, project called <xref target="MCF"></xref> but diverges from it
but diverges from it significantly because it is based on EBML (Extensible Binar significantly because it is based on EBML (Extensible Binary Meta Language)
y Meta Language) <xref target="RFC8794"></xref>, <xref target="RFC8794"></xref>, a binary derivative of XML. EBML
a binary derivative of XML. EBML provides significant advantages in terms of fut provides significant advantages in terms of future format extensibility,
ure format extensibility,
without breaking file support in parsers reading the previous versions.</t> without breaking file support in parsers reading the previous versions.</t>
<t>First, it is essential to clarify exactly &quot;What an Audio/Video container is&quot;, to avoid any misunderstandings:</t>
<ul spacing="compact"> <t>To avoid any misunderstandings, it is essential to clarify exactly
<li>It is NOT a video or audio compression format (codec)</li> what an audio/video container is:</t>
<ul>
<li>It is NOT a video or audio compression format (codec).</li>
<li>It is an envelope in which there can be many audio, video, and subtitles str eams, <li>It is an envelope in which there can be many audio, video, and subtitles str eams,
allowing the user to store a complete movie or CD in a single file.</li> allowing the user to store a complete movie or CD in a single file.</li>
</ul> </ul>
<t>Matroska is designed with the future in mind. It incorporates features such a s:</t> <t>Matroska is designed with the future in mind. It incorporates features such a s:</t>
<ul spacing="compact"> <ul>
<li>Fast seeking in the file</li> <li>Fast seeking in the file</li>
<li>Chapter entries</li> <li>Chapter entries</li>
<li>Full metadata (tags) support</li> <li>Full metadata (tags) support</li>
<li>Selectable subtitle/audio/video streams</li> <li>Selectable subtitle/audio/video streams</li>
<li>Modularly expandable</li> <li>Modularly expandable</li>
<li>Error resilience (can recover playback even when the stream is damaged)</li> <li>Error resilience (can recover playback even when the stream is damaged)</li>
<li>Streamable over the internet and local networks (HTTP <xref target="RFC9110" <li>Streamable over the Internet and local networks (HTTP <xref target="RFC9110"
></xref>, FTP <xref target="RFC0959"></xref>, SMB <xref target="SMB-CIFS"></xref ></xref>, FTP <xref target="RFC0959"></xref>, SMB <xref target="SMB-CIFS"></xref
>, etc.)</li> >, etc.)</li>
<li>Menus (like DVDs have <xref target="DVD-Video"></xref>)</li> <li>Menus (like menus that DVDs have <xref target="DVD-Video"></xref>)</li>
</ul> </ul>
</section> </section>
<section anchor="status-of-this-document"><name>Status of this document</name> <section anchor="status-of-this-document"><name>Status of This Document</name>
<t>This document covers Matroska versions 1, 2, 3 and 4. Matroska v4 is the curr <t>This document covers Matroska versions 1, 2, 3, and 4. Matroska version 4 is
ent version. the current version.
Matroska 1 to 3 are no longer maintained. No new elements are expected in files Matroska versions 1 to 3 are no longer maintained. No new elements are expected
with version numbers 1, 2, or 3.</t> in files with version numbers 1, 2, or 3.</t>
</section> </section>
<section anchor="notation-and-conventions"><name>Notation and Conventions</name> <section anchor="notation-and-conventions"><name>Notation and Conventions</name>
<t>The key words &quot;<bcp14>MUST</bcp14>&quot;, &quot;<bcp14>MUST NOT</bcp14>& <t>
quot;, The key words "<bcp14>MUST</bcp14>", "<bcp14>MUST NOT</bcp14>",
&quot;<bcp14>REQUIRED</bcp14>&quot;, &quot;<bcp14>SHALL</bcp14>&quot;, &quot;<bc "<bcp14>REQUIRED</bcp14>", "<bcp14>SHALL</bcp14>", "<bcp14>SHALL
p14>SHALL NOT</bcp14>&quot;, NOT</bcp14>", "<bcp14>SHOULD</bcp14>", "<bcp14>SHOULD NOT</bcp14>",
&quot;<bcp14>SHOULD</bcp14>&quot;, &quot;<bcp14>SHOULD NOT</bcp14>&quot;, "<bcp14>RECOMMENDED</bcp14>", "<bcp14>NOT RECOMMENDED</bcp14>",
&quot;<bcp14>RECOMMENDED</bcp14>&quot;, &quot;<bcp14>NOT RECOMMENDED</bcp14>&quo "<bcp14>MAY</bcp14>", and "<bcp14>OPTIONAL</bcp14>" in this document are
t;, to be interpreted as described in BCP&nbsp;14 <xref target="RFC2119"/>
&quot;<bcp14>MAY</bcp14>&quot;, and &quot;<bcp14>OPTIONAL</bcp14>&quot; in this <xref target="RFC8174"/> when, and only when, they appear in all capitals,
document are to be interpreted as as shown here. </t>
described in BCP 14 <xref target="RFC2119"></xref> <xref target="RFC8174"></xref
>
when, and only when, they appear in all capitals, as shown here.</t>
<t>This document defines specific terms in order to define the format and applic
ation of <tt>Matroska</tt>.
Specific terms are defined below:</t>
<dl spacing="compact"> <t>This document defines the following terms in order to
<dt><tt>Matroska</tt>:</dt> define the format and application of Matroska:
</t>
<dl>
<dt>Matroska:</dt>
<dd>A multimedia container format based on EBML (Extensible Binary Meta Language ).</dd> <dd>A multimedia container format based on EBML (Extensible Binary Meta Language ).</dd>
<dt><tt>Matroska Reader</tt>:</dt> <dt>Matroska Reader:</dt>
<dd>A data parser that interprets the semantics of a Matroska document and creat <dd>A data parser that interprets the semantics of a Matroska document and creat
es a way for programs to use <tt>Matroska</tt>.</dd> es a way for programs to use Matroska.</dd>
<dt><tt>Matroska Player</tt>:</dt> <dt>Matroska Player:</dt>
<dd>A <tt>Matroska Reader</tt> with a primary purpose of playing audiovisual fil <dd>A Matroska Reader with the primary purpose of playing audiovisual files, inc
es, including <tt>Matroska</tt> documents.</dd> luding Matroska documents.</dd>
<dt><tt>Matroska Writer</tt>:</dt> <dt>Matroska Writer:</dt>
<dd>A data writer that creates <tt>Matroska</tt> documents.</dd> <dd>A data writer that creates Matroska documents.</dd>
</dl> </dl>
</section> </section>
<section anchor="matroska-overview"><name>Matroska Overview</name> <section anchor="matroska-overview"><name>Matroska Overview</name>
<section anchor="principles"><name>Principles</name> <section anchor="principles"><name>Principles</name>
<t>Matroska is a Document Type of EBML (Extensible Binary Meta Language). <t>Matroska is a Document Type of EBML.
This specification is dependent on the EBML Specification <xref target="RFC8794" This specification is dependent on the EBML specification <xref target="RFC8794"
></xref>. ></xref>.
For an understanding of Matroska's EBML Schema, see in particular the sections o For an understanding of Matroska's EBML Schema, see in particular the sections o
f the EBML Specification covering f the EBML specification that cover
EBML Element Types (Section 7), EBML Element Types (Section <xref target="RFC8794" sectionFormat="bare" section=
EBML Schema (Section 11.1), "7"/>),
and EBML Structure (Section 3).</t> EBML Schema (Section <xref target="RFC8794" sectionFormat="bare" section="11.1"/
>),
and EBML Structure (Section <xref target="RFC8794" sectionFormat="bare" section=
"3"/>).</t>
</section> </section>
<section anchor="updates-to-rfc-8794"><name>Updates to RFC 8794</name> <section anchor="updates-to-rfc-8794"><name>Updates to RFC 8794</name>
<t>Because of an oversight, <xref target="RFC8794"></xref> reserved EBML ID 0x80 , which is used by deployed Matroska implementations. <t>Because of an oversight, <xref target="RFC8794"></xref> reserved EBML ID 0x80 , which is used by deployed Matroska implementations.
For this reason, this specification updates <xref target="RFC8794"></xref> to ma
ke 0x80 a legal EBML ID.
Specifically, the following are changed in <xref target="RFC8794"></xref>:</t>
<ul spacing="compact"> For this reason, this specification updates <xref target="RFC8794"></xref> to ma
<li>From Errata 7189</li> ke 0x80 a legal EBML ID. Additionally, this specification makes the following up
</ul> dates:</t>
<t>In Section 17.1,</t>
<ul>
<li><t><xref target="RFC8794" sectionFormat="of" section="17.1"/> (per Erratum I
D #7189 <xref target="Err7189"/>)</t>
<t>OLD:</t> <t>OLD:</t>
<t>One-octet Element IDs MUST be between 0x81 and 0xFE. These items are <blockquote>
<t>One-octet Element IDs <bcp14>MUST</bcp14> be between 0x81 and 0xFE. These it
ems are
valuable because they are short, and they need to be used for valuable because they are short, and they need to be used for
commonly repeated elements. Element IDs are to be allocated within commonly repeated elements. Element IDs are to be allocated within
this range according to the &quot;RFC Required&quot; policy [RFC8126].</t> this range according to the "RFC Required" policy <xref target="RFC8126"/>.</ t>
<t>The following one-octet Element IDs are RESERVED: 0xFF and 0x80.</t> <t>The following one-octet Element IDs are RESERVED: 0xFF and 0x80.</t>
</blockquote>
<t>NEW:</t> <t>NEW:</t>
<t>One-octet Element IDs MUST be between 0x80 and 0xFE. These items are <blockquote>
<t>One-octet Element IDs <bcp14>MUST</bcp14> be between 0x80 and 0xFE. These it
ems are
valuable because they are short, and they need to be used for valuable because they are short, and they need to be used for
commonly repeated elements. Element IDs are to be allocated within commonly repeated elements. Element IDs are to be allocated within
this range according to the &quot;RFC Required&quot; policy [RFC8126].</t> this range according to the "RFC Required" policy <xref target="RFC8126"/>.</ t>
<t>The following one-octet Element ID is RESERVED: 0xFF.</t> <t>The following one-octet Element ID is RESERVED: 0xFF.</t>
</blockquote>
</li>
<ul spacing="compact"> <li><t><xref target="RFC8794" sectionFormat="of" section="5"/> (per Erratum ID #
<li>From Errata 7191</li> 7191 <xref target="Err7191"/>)</t>
</ul>
<t>In Section 5,</t>
<t>OLD:</t>
<artwork> +=========================+================+=================+ <t>OLD:</t>
| Element ID Octet Length | Range of Valid | Number of Valid | <artwork>
| | Element IDs | Element IDs | +=========================+================+=================+
+=========================+================+=================+ | Element ID Octet Length | Range of Valid | Number of Valid |
| 1 | 0x81 - 0xFE | 126 | | | Element IDs | Element IDs |
+-------------------------+----------------+-----------------+ +=========================+================+=================+
| 1 | 0x81 - 0xFE | 126 |
+-------------------------+----------------+-----------------+
</artwork> </artwork>
-------------------------+----------------+-----------------+
<t>NEW:</t> <t>NEW:</t>
<artwork> +=========================+================+=================+ <artwork>
| Element ID Octet Length | Range of Valid | Number of Valid | +=========================+================+=================+
| | Element IDs | Element IDs | | Element ID Octet Length | Range of Valid | Number of Valid |
+=========================+================+=================+ | | Element IDs | Element IDs |
| 1 | 0x80 - 0xFE | 127 | +=========================+================+=================+
+-------------------------+----------------+-----------------+ | 1 | 0x80 - 0xFE | 127 |
+-------------------------+----------------+-----------------+
</artwork> </artwork>
-------------------------+----------------+-----------------+
</li>
</ul>
</section> </section>
<section anchor="added-ebml-constraints"><name>Added EBML Constraints</name> <section anchor="added-ebml-constraints"><name>Added EBML Constraints</name>
<t>As an EBML Document Type, Matroska adds the following constraints to the EBML specification.</t> <t>As an EBML Document Type, Matroska adds the following constraints to the EBML specification <xref target="RFC8794"></xref>:</t>
<ul spacing="compact"> <ul>
<li>The <tt>docType</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp14> be &quo <li>The <tt>docType</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp14> be "mat
t;matroska&quot;.</li> roska".</li>
<li>The <tt>EBMLMaxIDLength</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp14> be 4.</li> <li>The <tt>EBMLMaxIDLength</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp14> be 4.</li>
<li>The <tt>EBMLMaxSizeLength</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp1 4> be between 1 and 8 inclusive.</li> <li>The <tt>EBMLMaxSizeLength</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp1 4> be between 1 and 8, inclusive.</li>
</ul> </ul>
</section> </section>
<section anchor="design-rules"><name>Design Rules</name> <section anchor="design-rules"><name>Design Rules</name>
<t>The Root Element and all Top-Levels Elements <bcp14>MUST</bcp14> use 4 octets
for their EBML Element ID -- i.e. Segment and direct children of Segment.</t> <t>The <tt>Root Element</tt> and all <tt>Top-Level Elements</tt> <bcp14>MUST</bc
<t>Legacy EBML/Matroska parsers did not handle Empty Elements properly, elements p14> use 4 octets for their EBML Element ID -- i.e., <tt>Segment</tt> and direct
present in the file but with a length of zero. children of <tt>Segment</tt>.</t>
They always assumed the value was 0 for integers/dates or 0x0p+0, the textual ex
pression of floats using the <xref target="ISO9899"></xref> format, no matter th <t>Legacy EBML/Matroska parsers did not handle Empty Elements properly; elements
e default value of the element which should have been used instead. were present in the file but had a length of 0.
Therefore, Matroska writers <bcp14>MUST NOT</bcp14> use EBML Empty Elements, if They always assumed the value was 0 for integers/dates or 0x0p+0, the textual ex
the element has a default value that is not 0 for integers/dates and 0x0p+0 for pression of floats using the format in <xref target="ISO9899"></xref>, no matter
floats.</t> the default value of the element that should have been used instead.
Therefore, Matroska Writers <bcp14>MUST NOT</bcp14> use EBML Empty Elements if t
he element has a default value that is not 0 for integers/dates and 0x0p+0 for f
loats.</t>
<t>When adding new elements to Matroska, these rules apply:</t> <t>When adding new elements to Matroska, these rules apply:</t>
<ul spacing="compact"> <ul>
<li>A non-mandatory integer/date Element <bcp14>MUST NOT</bcp14> have a default value other than 0.</li> <li>A non-mandatory integer/date Element <bcp14>MUST NOT</bcp14> have a default value other than 0.</li>
<li>A non-mandatory float Element <bcp14>MUST NOT</bcp14> have a default value o ther than 0x0p+0.</li> <li>A non-mandatory float Element <bcp14>MUST NOT</bcp14> have a default value o ther than 0x0p+0.</li>
<li>A non-mandatory string Element <bcp14>MUST NOT</bcp14> have a default value , as empty string cannot be defined in the XML Schema.</li> <li>A non-mandatory string Element <bcp14>MUST NOT</bcp14> have a default value , as empty strings cannot be defined in the XML Schema.</li>
</ul> </ul>
</section> </section>
<section anchor="data-layout"><name>Data Layout</name> <section anchor="data-layout"><name>Data Layout</name>
<t>A Matroska file <bcp14>MUST</bcp14> be composed of at least one <tt>EBML Docu ment</tt> using the <tt>Matroska Document Type</tt>. <t>A Matroska file <bcp14>MUST</bcp14> be composed of at least one <tt>EBML Docu ment</tt> using the <tt>Matroska Document Type</tt>.
Each <tt>EBML Document</tt> <bcp14>MUST</bcp14> start with an <tt>EBML Header</t Each <tt>EBML Document</tt> <bcp14>MUST</bcp14> start with an <tt>EBML Header</t
t> and <bcp14>MUST</bcp14> be followed by the <tt>EBML Root Element</tt>, t> and <bcp14>MUST</bcp14> be followed by the <tt>EBML Root Element</tt>, define
defined as <tt>Segment</tt> in Matroska. Matroska defines several <tt>Top-Level d as <tt>Segment</tt> in Matroska. Matroska defines several <tt>Top-Level Elemen
Elements</tt> ts</tt>
which may occur within the <tt>Segment</tt>.</t> that may occur within the <tt>Segment</tt>.</t>
<t>As an example, a simple Matroska file consisting of a single <tt>EBML Documen t</tt> could be represented like this:</t> <t>As an example, a simple Matroska file consisting of a single <tt>EBML Documen t</tt> could be represented like this:</t>
<ul spacing="compact"> <ul spacing="compact">
<li><tt>EBML Header</tt></li> <li><tt>EBML Header</tt></li>
<li><tt>Segment</tt></li> <li><tt>Segment</tt></li>
</ul> </ul>
<t>A more complex Matroska file consisting of an <tt>EBML Stream</tt> (consistin g of two <tt>EBML Documents</tt>) could be represented like this:</t> <t>A more complex Matroska file consisting of an <tt>EBML Stream</tt> (consistin g of two <tt>EBML Documents</tt>) could be represented like this:</t>
<ul spacing="compact"> <ul spacing="compact">
<li><tt>EBML Header</tt></li> <li><tt>EBML Header</tt></li>
<li><tt>Segment</tt></li> <li><tt>Segment</tt></li>
<li><tt>EBML Header</tt></li> <li><tt>EBML Header</tt></li>
<li><tt>Segment</tt></li> <li><tt>Segment</tt></li>
</ul> </ul>
<t>The following diagram represents a simple Matroska file, comprised of an <tt> EBML Document</tt> <t>The following diagram represents a simple Matroska file, comprised of an <tt> EBML Document</tt>
with an <tt>EBML Header</tt>, a <tt>Segment Element</tt> (the <tt>Root Element</ tt>), and all eight Matroska with an <tt>EBML Header</tt>, a <tt>Segment Element</tt> (the <tt>Root Element</ tt>), and all eight Matroska
<tt>Top-Level Elements</tt>. In the following diagrams of this section, horizont al spacing expresses <tt>Top-Level Elements</tt>. In the diagrams in this section, horizontal spacing expresses
a parent-child relationship between Matroska Elements (e.g., the <tt>Info Elemen t</tt> is contained within a parent-child relationship between Matroska Elements (e.g., the <tt>Info Elemen t</tt> is contained within
the <tt>Segment Element</tt>) whereas vertical alignment represents the storage the <tt>Segment Element</tt>), whereas vertical alignment represents the storage
order within the file.</t> order within the file.</t>
<figure><name>Basic layout of a Matroska file. <figure><name>Basic Layout of a Matroska File</name>
</name> <artwork>
<artwork>+-------------+ +-------------+
| EBML Header | | EBML Header |
+---------------------------+ +---------------------------+
| Segment | SeekHead | | Segment | SeekHead |
| |-------------| | |-------------|
| | Info | | | Info |
| |-------------| | |-------------|
| | Tracks | | | Tracks |
| |-------------| | |-------------|
| | Chapters | | | Chapters |
| |-------------| | |-------------|
skipping to change at line 216 skipping to change at line 269
| | Cues | | | Cues |
| |-------------| | |-------------|
| | Attachments | | | Attachments |
| |-------------| | |-------------|
| | Tags | | | Tags |
+---------------------------+ +---------------------------+
</artwork> </artwork>
</figure> </figure>
<t>The Matroska <tt>EBML Schema</tt> defines eight <tt>Top-Level Elements</tt>:< /t> <t>The Matroska <tt>EBML Schema</tt> defines eight <tt>Top-Level Elements</tt>:< /t>
<ul spacing="compact"> <ul>
<li><tt>SeekHead</tt> (<xref target="seekhead"></xref>),</li> <li><tt>SeekHead</tt> (<xref target="seekhead"></xref>)</li>
<li><tt>Info</tt> (<xref target="info"></xref>),</li> <li><tt>Info</tt> (<xref target="info"></xref>)</li>
<li><tt>Tracks</tt> (<xref target="track-flags"></xref>),</li> <li><tt>Tracks</tt> (<xref target="track-flags"></xref>)</li>
<li><tt>Chapters</tt> (<xref target="chapters"></xref>),</li> <li><tt>Chapters</tt> (<xref target="chapters"></xref>)</li>
<li><tt>Cluster</tt> (<xref target="cluster-blocks"></xref>),</li> <li><tt>Cluster</tt> (<xref target="cluster-blocks"></xref>)</li>
<li><tt>Cues</tt> (<xref target="cues"></xref>),</li> <li><tt>Cues</tt> (<xref target="cues"></xref>)</li>
<li><tt>Attachments</tt> (<xref target="attachments-1"></xref>),</li> <li><tt>Attachments</tt> (<xref target="attachments-1"></xref>)</li>
<li>and <tt>Tags</tt> (<xref target="tags"></xref>).</li> <li><tt>Tags</tt> (<xref target="tags"></xref>)</li>
</ul> </ul>
<t>The <tt>SeekHead Element</tt> (also known as <tt>MetaSeek</tt>) contains an i ndex of <tt>Top-Level Elements</tt> <t>The <tt>SeekHead Element</tt> (also known as <tt>MetaSeek</tt>) contains an i ndex of <tt>Top-Level Elements</tt>
locations within the <tt>Segment</tt>. Use of the <tt>SeekHead Element</tt> is < bcp14>RECOMMENDED</bcp14>. Without a <tt>SeekHead Element</tt>, locations within the <tt>Segment</tt>. Use of the <tt>SeekHead Element</tt> is < bcp14>RECOMMENDED</bcp14>. Without a <tt>SeekHead Element</tt>,
a Matroska parser would have to search the entire file to find all of the other <tt>Top-Level Elements</tt>. a Matroska parser would have to search the entire file to find all of the other <tt>Top-Level Elements</tt>.
This is due to Matroska's flexible ordering requirements; for instance, it is ac ceptable for This is due to Matroska's flexible ordering requirements; for instance, it is ac ceptable for
the <tt>Chapters Element</tt> to be stored after the <tt>Cluster Elements</tt>.< the <tt>Chapters Element</tt> to be stored after the <tt>Cluster Element(s)</tt>
/t> .</t>
<figure><name>Representation of a <tt>SeekHead Element</tt>. <figure><name>Representation of a <tt>SeekHead Element</tt>
</name> </name>
<artwork>+--------------------------------+ <artwork>
+--------------------------------+
| SeekHead | Seek | SeekID | | SeekHead | Seek | SeekID |
| | |--------------| | | |--------------|
| | | SeekPosition | | | | SeekPosition |
+--------------------------------+ +--------------------------------+
</artwork> </artwork>
</figure> </figure>
<t>The <tt>Info Element</tt> contains vital information for identifying the whol e <tt>Segment</tt>. <t>The <tt>Info Element</tt> contains vital information for identifying the whol e <tt>Segment</tt>.
This includes the title for the <tt>Segment</tt>, a randomly generated unique id This includes the title for the <tt>Segment</tt>, a randomly generated unique id
entifier, entifier (UID),
and the unique identifier(s) of any linked <tt>Segment Elements</tt>.</t> and the UID(s) of any linked <tt>Segment Elements</tt>.</t>
<figure><name>Representation of an <tt>Info Element</tt> and its <tt>Child Eleme <figure><name>Representation of an <tt>Info Element</tt> and Its <tt>Child Eleme
nts</tt>. nts</tt>
</name> </name>
<artwork>+-------------------------+ <artwork>
+-------------------------+
| Info | SegmentUUID | | Info | SegmentUUID |
| |------------------| | |------------------|
| | SegmentFilename | | | SegmentFilename |
| |------------------| | |------------------|
| | PrevUUID | | | PrevUUID |
| |------------------| | |------------------|
| | PrevFilename | | | PrevFilename |
| |------------------| | |------------------|
| | NextUUID | | | NextUUID |
| |------------------| | |------------------|
skipping to change at line 277 skipping to change at line 332
| |------------------| | |------------------|
| | Title | | | Title |
| |------------------| | |------------------|
| | MuxingApp | | | MuxingApp |
| |------------------| | |------------------|
| | WritingApp | | | WritingApp |
|-------------------------| |-------------------------|
</artwork> </artwork>
</figure> </figure>
<t>The <tt>Tracks Element</tt> defines the technical details for each track and can store the name, <t>The <tt>Tracks Element</tt> defines the technical details for each track and can store the name,
number, unique identifier, language, and type (audio, video, subtitles, etc.) of each track. number, UID, language, and type (audio, video, subtitles, etc.) of each track.
For example, the <tt>Tracks Element</tt> <bcp14>MAY</bcp14> store information ab out the resolution of a video track For example, the <tt>Tracks Element</tt> <bcp14>MAY</bcp14> store information ab out the resolution of a video track
or sample rate of an audio track.</t> or sample rate of an audio track.</t>
<t>The <tt>Tracks Element</tt> <bcp14>MUST</bcp14> identify all the data needed by the codec to decode the data of the <t>The <tt>Tracks Element</tt> <bcp14>MUST</bcp14> identify all the data needed by the codec to decode the data of the
specified track. However, the data required is contingent on the codec used for the track. specified track. However, the data required is contingent on the codec used for the track.
For example, a <tt>Track Element</tt> for uncompressed audio only requires the a udio bit rate to be present. For example, a <tt>Tracks Element</tt> for uncompressed audio only requires the audio bit rate to be present.
A codec such as AC-3 would require that the <tt>CodecID Element</tt> be present for all tracks, A codec such as AC-3 would require that the <tt>CodecID Element</tt> be present for all tracks,
as it is the primary way to identify which codec to use to decode the track.</t> as it is the primary way to identify which codec to use to decode the track.</t>
<figure><name>Representation of the <tt>Tracks Element</tt> and a selection of i ts <tt>Descendant Elements</tt>. <figure><name>Representation of the <tt>Tracks Element</tt> and a Selection of I ts <tt>Descendant Elements</tt>
</name> </name>
<artwork>+------------------------------------+ <artwork>
+------------------------------------+
| Tracks | TrackEntry | TrackNumber | | Tracks | TrackEntry | TrackNumber |
| | |--------------| | | |--------------|
| | | TrackUID | | | | TrackUID |
| | |--------------| | | |--------------|
| | | TrackType | | | | TrackType |
| | |--------------| | | |--------------|
| | | Name | | | | Name |
| | |--------------| | | |--------------|
| | | Language | | | | Language |
| | |--------------| | | |--------------|
skipping to change at line 322 skipping to change at line 378
| | | | PixelWidth | | | | | PixelWidth |
| | | |-------------------| | | | |-------------------|
| | | | PixelHeight | | | | | PixelHeight |
| | | |-------------------| | | | |-------------------|
| | | | DisplayWidth | | | | | DisplayWidth |
| | | |-------------------| | | | |-------------------|
| | | | DisplayHeight | | | | | DisplayHeight |
| | | |-------------------| | | | |-------------------|
| | | | AspectRatioType | | | | | AspectRatioType |
| | | |-------------------| | | | |-------------------|
| | | | Color | | | | | Colour |
| | |----------------------------------| | | |----------------------------------|
| | | Audio | SamplingFrequency | | | | Audio | SamplingFrequency |
| | | |-------------------| | | | |-------------------|
| | | | Channels | | | | | Channels |
| | | |-------------------| | | | |-------------------|
| | | | BitDepth | | | | | BitDepth |
|--------------------------------------------------------| |--------------------------------------------------------|
</artwork> </artwork>
</figure> </figure>
<t>The <tt>Chapters Element</tt> lists all of the chapters. Chapters are a way t o set predefined <t>The <tt>Chapters Element</tt> lists all of the chapters. <tt>Chapters</tt> ar e a way to set predefined
points to jump to in video or audio.</t> points to jump to in video or audio.</t>
<figure><name>Representation of the <tt>Chapters Element</tt> and a selection of its <tt>Descendant Elements</tt>. <figure><name>Representation of the <tt>Chapters Element</tt> and a Selection of Its <tt>Descendant Elements</tt>
</name> </name>
<artwork>+-----------------------------------------+ <artwork>
+-----------------------------------------+
| Chapters | Edition | EditionUID | | Chapters | Edition | EditionUID |
| | Entry |--------------------| | | Entry |--------------------|
| | | EditionFlagDefault | | | | EditionFlagDefault |
| | |--------------------| | | |--------------------|
| | | EditionFlagOrdered | | | | EditionFlagOrdered |
| | |---------------------------------+ | | |---------------------------------+
| | | ChapterAtom | ChapterUID | | | | ChapterAtom | ChapterUID |
| | | |-------------------| | | | |-------------------|
| | | | ChapterStringUID | | | | | ChapterStringUID |
| | | |-------------------| | | | |-------------------|
skipping to change at line 362 skipping to change at line 418
| | | | ChapterFlagHidden | | | | | ChapterFlagHidden |
| | | |-------------------------------+ | | | |-------------------------------+
| | | | ChapterDisplay | ChapString | | | | | ChapterDisplay | ChapString |
| | | | |--------------| | | | | |--------------|
| | | | | ChapLanguage | | | | | | ChapLanguage |
+------------------------------------------------------------------+ +------------------------------------------------------------------+
</artwork> </artwork>
</figure> </figure>
<t><tt>Cluster Elements</tt> contain the content for each track, e.g., video fra mes. A Matroska file <t><tt>Cluster Elements</tt> contain the content for each track, e.g., video fra mes. A Matroska file
<bcp14>SHOULD</bcp14> contain at least one <tt>Cluster Element</tt>. <bcp14>SHOULD</bcp14> contain at least one <tt>Cluster Element</tt>.
In the rare case it doesn't, there should be a form of Segment linking with othe In the rare case it doesn't, there should be a method for <tt>Segments</tt> to l
r Segments, possibly using Chapters, see <xref target="linked-segments"></xref>. ink
</t> together, possibly using <tt>Chapters</tt>; see <xref target="linked-segments"><
/xref>.</t>
<t>The <tt>Cluster Element</tt> helps to break up <t>The <tt>Cluster Element</tt> helps to break up
<tt>SimpleBlock</tt> or <tt>BlockGroup Elements</tt> and helps with seeking and error protection. <tt>SimpleBlock</tt> or <tt>BlockGroup Elements</tt> and helps with seeking and error protection.
Every <tt>Cluster Element</tt> <bcp14>MUST</bcp14> contain a <tt>Timestamp Eleme nt</tt>. Every <tt>Cluster Element</tt> <bcp14>MUST</bcp14> contain a <tt>Timestamp Eleme nt</tt>.
This <bcp14>SHOULD</bcp14> be the <tt>Timestamp Element</tt> used to play the fi rst <tt>Block</tt> in the <tt>Cluster Element</tt>, This <bcp14>SHOULD</bcp14> be the <tt>Timestamp Element</tt> used to play the fi rst <tt>Block</tt> in the <tt>Cluster Element</tt>,
unless a different value is needed to accommodate for more Blocks, see <xref tar unless a different value is needed to accommodate for more <tt>Blocks</tt>; see
get="block-timestamps"></xref>.</t> <xref target="block-timestamps"></xref>.</t>
<t><tt>Cluster Elements</tt> contain one or more block element, such as <tt>Bloc <t><tt>Cluster Elements</tt> contain one or more <tt>Block</tt> element, such as
kGroup</tt> or <tt>SimpleBlock</tt> elements. <tt>BlockGroup</tt> or <tt>SimpleBlock</tt> elements.
In some situations, a <tt>Cluster Element</tt> <bcp14>MAY</bcp14> contain no blo In some situations, a <tt>Cluster Element</tt> <bcp14>MAY</bcp14> contain no <tt
ck element, for example in a live recording >Block</tt> element, for example, in a live recording
when no data has been collected.</t> when no data has been collected.</t>
<t>A <tt>BlockGroup Element</tt> <bcp14>MAY</bcp14> contain a <tt>Block</tt> of data and any information relating directly to that <tt>Block</tt>.</t> <t>A <tt>BlockGroup Element</tt> <bcp14>MAY</bcp14> contain a <tt>Block</tt> of data and any information relating directly to that <tt>Block</tt>.</t>
<figure><name>Representation of a <tt>Cluster Element</tt> and its immediate <tt >Child Elements</tt>. <figure><name>Representation of a <tt>Cluster Element</tt> and Its Immediate <tt >Child Elements</tt>
</name> </name>
<artwork>+--------------------------+ <artwork>
+--------------------------+
| Cluster | Timestamp | | Cluster | Timestamp |
| |----------------| | |----------------|
| | Position | | | Position |
| |----------------| | |----------------|
| | PrevSize | | | PrevSize |
| |----------------| | |----------------|
| | SimpleBlock | | | SimpleBlock |
| |----------------| | |----------------|
| | BlockGroup | | | BlockGroup |
+--------------------------+ +--------------------------+
</artwork> </artwork>
</figure> </figure>
<figure><name>Representation of the <tt>Block Element</tt> structure. <figure><name>Representation of the <tt>Block Element</tt> Structure
</name> </name>
<artwork>+----------------------------------+ <artwork>
+----------------------------------+
| Block | Portion of | Data Type | | Block | Portion of | Data Type |
| | a Block | - Bit Flag | | | a Block | - Bit Flag |
| |--------------------------+ | |--------------------------+
| | Header | TrackNumber | | | Header | TrackNumber |
| | |-------------| | | |-------------|
| | | Timestamp | | | | Timestamp |
| | |-------------| | | |-------------|
| | | Flags | | | | Flags |
| | | - Gap | | | | - Gap |
| | | - Lacing | | | | - Lacing |
| | | - Reserved | | | | - Reserved |
| |--------------------------| | |--------------------------|
| | Optional | FrameSize | | | Optional | FrameSize |
| |--------------------------| | |--------------------------|
| | Data | Frame | | | Data | Frame |
+----------------------------------+ +----------------------------------+
</artwork> </artwork>
</figure> </figure>
<t>Each <tt>Cluster</tt> <bcp14>MUST</bcp14> contain exactly one <tt>Timestamp E lement</tt>. The <tt>Timestamp Element</tt> value <bcp14>MUST</bcp14> <t>Each <tt>Cluster</tt> <bcp14>MUST</bcp14> contain exactly one <tt>Timestamp E lement</tt>. The <tt>Timestamp Element</tt> value <bcp14>MUST</bcp14>
be stored once per <tt>Cluster</tt>. The <tt>Timestamp Element</tt> in the <tt>C luster</tt> is relative to the entire <tt>Segment</tt>. be stored once per <tt>Cluster</tt>. The <tt>Timestamp Element</tt> in the <tt>C luster</tt> is relative to the entire <tt>Segment</tt>.
The <tt>Timestamp Element</tt> <bcp14>SHOULD</bcp14> be the first <tt>Element</t The <tt>Timestamp Element</tt> <bcp14>SHOULD</bcp14> be the first Element in the
t> in the <tt>Cluster</tt> it belongs to, <tt>Cluster</tt> it belongs to
or the second <tt>Element</tt> if that Cluster contains a CRC-32 element (<xref or the second Element if that <tt>Cluster</tt> contains a <tt>CRC-32</tt> elemen
target="crc-32"></xref>)</t> t (<xref target="crc-32"></xref>)</t>
<t>Additionally, the <tt>Block</tt> contains an offset that, when added to the < tt>Cluster</tt>'s <tt>Timestamp Element</tt> value, <t>Additionally, the <tt>Block</tt> contains an offset that, when added to the < tt>Cluster</tt>'s <tt>Timestamp Element</tt> value,
yields the <tt>Block</tt>'s effective timestamp. Therefore, timestamp in the <tt >Block</tt> itself is relative to yields the <tt>Block</tt>'s effective timestamp. Therefore, the timestamp in the <tt>Block</tt> itself is relative to
the <tt>Timestamp Element</tt> in the <tt>Cluster</tt>. For example, if the <tt> Timestamp Element</tt> in the <tt>Cluster</tt> the <tt>Timestamp Element</tt> in the <tt>Cluster</tt>. For example, if the <tt> Timestamp Element</tt> in the <tt>Cluster</tt>
is set to 10 seconds and a <tt>Block</tt> in that <tt>Cluster</tt> is supposed t o be played 12 seconds into the clip, is set to 10 seconds and a <tt>Block</tt> in that <tt>Cluster</tt> is supposed t o be played 12 seconds into the clip,
the timestamp in the <tt>Block</tt> would be set to 2 seconds.</t> the timestamp in the <tt>Block</tt> would be set to 2 seconds.</t>
<t>The <tt>ReferenceBlock</tt> in the <tt>BlockGroup</tt> is used instead of the <t>The <tt>ReferenceBlock</tt> in the <tt>BlockGroup</tt> is used instead of the
basic &quot;P-frame&quot;/&quot;B-frame&quot; description. basic "P-frame"/"B-frame" description.
Instead of simply saying that this <tt>Block</tt> depends on the <tt>Block</tt> Instead of simply saying that this <tt>Block</tt> depends on the <tt>Block</tt>
directly before, or directly afterwards, directly before or directly after,
the <tt>Timestamp</tt> of the necessary <tt>Block</tt> is used. Because there ca n be as many <tt>ReferenceBlock Elements</tt> the <tt>Timestamp</tt> of the necessary <tt>Block</tt> is used. Because there ca n be as many <tt>ReferenceBlock Elements</tt>
as necessary for a <tt>Block</tt>, it allows for some extremely complex referenc ing.</t> as necessary for a <tt>Block</tt>, it allows for some extremely complex referenc ing.</t>
<t>The <tt>Cues Element</tt> is used to seek when playing back a file by providi ng a temporal index <t>The <tt>Cues Element</tt> is used to seek when playing back a file by providi ng a temporal index
for some of the <tt>Tracks</tt>. It is similar to the <tt>SeekHead Element</tt>, but used for seeking to for some of the <tt>Tracks</tt>. It is similar to the <tt>SeekHead Element</tt> but is used for seeking to
a specific time when playing back the file. It is possible to seek without this element, a specific time when playing back the file. It is possible to seek without this element,
but it is much more difficult because a <tt>Matroska Reader</tt> would have to ' but it is much more difficult because a Matroska Reader would have to "hunt and
hunt and peck' peck"
through the file looking for the correct timestamp.</t> through the file to look for the correct timestamp.</t>
<t>The <tt>Cues Element</tt> <bcp14>SHOULD</bcp14> contain at least one <tt>CueP oint Element</tt>. Each <tt>CuePoint Element</tt> <t>The <tt>Cues Element</tt> <bcp14>SHOULD</bcp14> contain at least one <tt>CueP oint Element</tt>. Each <tt>CuePoint Element</tt>
stores the position of the <tt>Cluster</tt> that contains the <tt>BlockGroup</tt > or <tt>SimpleBlock Element</tt>. stores the position of the <tt>Cluster</tt> that contains the <tt>BlockGroup</tt > or <tt>SimpleBlock Element</tt>.
The timestamp is stored in the <tt>CueTime Element</tt> and location is stored i The timestamp is stored in the <tt>CueTime Element</tt>, and the location is sto
n the <tt>CueTrackPositions Element</tt>.</t> red in the <tt>CueTrackPositions Element</tt>.</t>
<t>The <tt>Cues Element</tt> is flexible. For instance, <tt>Cues Element</tt> ca <t>The <tt>Cues Element</tt> is flexible. For instance, the <tt>Cues Element</tt
n be used to index every > can be used to index every
single timestamp of every <tt>Block</tt> or they can be indexed selectively.</t> single timestamp of every <tt>Block</tt> or they can be indexed selectively.</t>
<figure><name>Representation of a <tt>Cues Element</tt> and two levels of its <t t>Descendant Elements</tt>. <figure><name>Representation of a <tt>Cues Element</tt> and Two Levels of Its <t t>Descendant Elements</tt>
</name> </name>
<artwork>+-------------------------------------+ <artwork>
+-------------------------------------+
| Cues | CuePoint | CueTime | | Cues | CuePoint | CueTime |
| | |-------------------| | | |-------------------|
| | | CueTrackPositions | | | | CueTrackPositions |
| |------------------------------| | |------------------------------|
| | CuePoint | CueTime | | | CuePoint | CueTime |
| | |-------------------| | | |-------------------|
| | | CueTrackPositions | | | | CueTrackPositions |
+-------------------------------------+ +-------------------------------------+
</artwork> </artwork>
</figure> </figure>
<t>The <tt>Attachments Element</tt> is for attaching files to a Matroska file su <t>The <tt>Attachments Element</tt> is for attaching files to a Matroska file, s
ch as pictures, uch as pictures,
fonts, webpages, etc.</t> fonts, web pages, etc.</t>
<figure><name>Representation of an <tt>Attachments Element</tt>. <figure><name>Representation of an <tt>Attachments Element</tt>
</name> </name>
<artwork>+------------------------------------------------+ <artwork>
+------------------------------------------------+
| Attachments | AttachedFile | FileDescription | | Attachments | AttachedFile | FileDescription |
| | |-------------------| | | |-------------------|
| | | FileName | | | | FileName |
| | |-------------------| | | |-------------------|
| | | FileMediaType | | | | FileMediaType |
| | |-------------------| | | |-------------------|
| | | FileData | | | | FileData |
| | |-------------------| | | |-------------------|
| | | FileUID | | | | FileUID |
| | |-------------------| | | |-------------------|
skipping to change at line 472 skipping to change at line 533
| | |-------------------| | | |-------------------|
| | | FileUsedStartTime | | | | FileUsedStartTime |
| | |-------------------| | | |-------------------|
| | | FileUsedEndTime | | | | FileUsedEndTime |
+------------------------------------------------+ +------------------------------------------------+
</artwork> </artwork>
</figure> </figure>
<t>The <tt>Tags Element</tt> contains metadata that describes the <tt>Segment</t t> and potentially <t>The <tt>Tags Element</tt> contains metadata that describes the <tt>Segment</t t> and potentially
its <tt>Tracks</tt>, <tt>Chapters</tt>, and <tt>Attachments</tt>. Each <tt>Track </tt> or <tt>Chapter</tt> that those tags its <tt>Tracks</tt>, <tt>Chapters</tt>, and <tt>Attachments</tt>. Each <tt>Track </tt> or <tt>Chapter</tt> that those tags
applies to has its UID listed in the <tt>Tags</tt>. The <tt>Tags</tt> contain al l extra information about applies to has its UID listed in the <tt>Tags</tt>. The <tt>Tags</tt> contain al l extra information about
the file: scriptwriter, singer, actors, directors, titles, edition, price, dates the file: scriptwriters, singers, actors, directors, titles, edition, price, dat
, genre, comments, es, genre, comments,
etc. Tags can contain their values in multiple languages. For example, a movie's etc. <tt>Tags</tt> can contain their values in multiple languages.
&quot;title&quot; <tt>Tag</tt> For example, a movie's "TITLE" <tt>Tag</tt> might contain both the original
might contain both the original English title as well as the title it was releas English title as well as the German title.</t>
ed as in Germany.</t> <figure><name>Representation of a <tt>Tags Element</tt> and Three Levels of Its
<figure><name>Representation of a <tt>Tags Element</tt> and three levels of its <tt>Children Elements</tt>
<tt>Children Elements</tt>.
</name> </name>
<artwork>+-------------------------------------------+ <artwork>
+-------------------------------------------+
| Tags | Tag | Targets | TargetTypeValue | | Tags | Tag | Targets | TargetTypeValue |
| | | |------------------| | | | |------------------|
| | | | TargetType | | | | | TargetType |
| | | |------------------| | | | |------------------|
| | | | TagTrackUID | | | | | TagTrackUID |
| | | |------------------| | | | |------------------|
| | | | TagEditionUID | | | | | TagEditionUID |
| | | |------------------| | | | |------------------|
| | | | TagChapterUID | | | | | TagChapterUID |
| | | |------------------| | | | |------------------|
skipping to change at line 508 skipping to change at line 571
| | | | TagBinary | | | | | TagBinary |
| | | |------------------| | | | |------------------|
| | | | SimpleTag | | | | | SimpleTag |
+-------------------------------------------+ +-------------------------------------------+
</artwork> </artwork>
</figure> </figure>
</section> </section>
</section> </section>
<section anchor="matroska-schema"><name>Matroska Schema</name> <section anchor="matroska-schema"><name>Matroska Schema</name>
<t>This specification includes an <tt>EBML Schema</tt>, which defines the Elemen <t>This specification includes an <tt>EBML Schema</tt> that defines the Elements
ts and structure and structure
of Matroska using the EBML Schema elements and attributes defined in Section 11. of Matroska using the EBML Schema elements and attributes defined in <xref targe
1 of <xref target="RFC8794"></xref>. t="RFC8794" sectionFormat="of" section="11.1"/>.</t>
The EBML Schema defines every valid Matroska element in a manner defined by the <t>Attributes using their default value (like <tt>minOccurs</tt>, <tt>minver</tt
EBML specification.</t> >, etc.) or attributes with undefined values (like <tt>length</tt>, <tt>maxver</
<t>Attributes using their default value like <tt>minOccurs</tt>, <tt>minver</tt> tt>, etc.) are omitted.</t>
, etc. or with undefined values like <tt>length</tt>, <tt>maxver</tt>, etc. are <t>The definitions for each Matroska Element are provided below.</t>
omitted.</t>
<t>Here the definition of each Matroska Element is provided.</t>
<section anchor="segment-element"><name>Segment Element</name> <section anchor="segment-element"><name>Segment Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x18538067 / master</dd> <dd>0x18538067 / master</dd>
</dl> <dt>unknownsizeallowed:</dt>
<t>unknownsizeallowed: True</t> <dd>True</dd>
<dl spacing="compact">
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment</tt></dd> <dd><tt>\Segment</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Root Element that contains all other Top-Level Elements; see <xref targe t="data-layout"></xref>.</dd> <dd>The <tt>Root Element</tt> that contains all other <tt>Top-Level Elements</tt >; see <xref target="data-layout"></xref>.</dd>
</dl> </dl>
<section anchor="seekhead-element"><name>SeekHead Element</name> <section anchor="seekhead-element"><name>SeekHead Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x114D9B74 / master</dd> <dd>0x114D9B74 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\SeekHead</tt></dd> <dd><tt>\Segment\SeekHead</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains seeking information of Top-Level Elements; see <xref target="data-l ayout"></xref>.</dd> <dd>Contains seeking information of <tt>Top-Level Elements</tt>; see <xref targe t="data-layout"></xref>.</dd>
</dl> </dl>
<section anchor="seek-element"><name>Seek Element</name> <section anchor="seek-element"><name>Seek Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4DBB / master</dd> <dd>0x4DBB / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\SeekHead\Seek</tt></dd> <dd><tt>\Segment\SeekHead\Seek</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
skipping to change at line 583 skipping to change at line 643
<section anchor="seekposition-element"><name>SeekPosition Element</name> <section anchor="seekposition-element"><name>SeekPosition Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x53AC / uinteger</dd> <dd>0x53AC / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\SeekHead\Seek\SeekPosition</tt></dd> <dd><tt>\Segment\SeekHead\Seek\SeekPosition</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Segment Position (<xref target="segment-position"></xref>) of a Top-Leve l Element.</dd> <dd>The <tt>Segment Position</tt> (<xref target="segment-position"></xref>) of a Top-Level Element.</dd>
</dl> </dl>
</section> </section>
</section> </section>
</section> </section>
<section anchor="info-element"><name>Info Element</name> <section anchor="info-element"><name>Info Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1549A966 / master</dd> <dd>0x1549A966 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info</tt></dd> <dd><tt>\Segment\Info</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
</dl> <dt>recurring:</dt><dd>True</dd>
<t>recurring: True</t>
<dl spacing="compact">
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains general information about the Segment.</dd> <dd>Contains general information about the <tt>Segment</tt>.</dd>
</dl> </dl>
<section anchor="segmentuuid-element"><name>SegmentUUID Element</name> <section anchor="segmentuuid-element"><name>SegmentUUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x73A4 / binary</dd> <dd>0x73A4 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>16</dd> <dd>16</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\SegmentUUID</tt></dd> <dd><tt>\Segment\Info\SegmentUUID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A randomly generated unique ID to identify the Segment amongst many others ( 128 bits). It is equivalent to a UUID v4 <xref target="RFC4122"></xref> with all bits randomly (or pseudo-randomly) chosen. An actual UUID v4 value, where some bits are not random, <bcp14>MAY</bcp14> also be used.</dd> <dd>A randomly generated UID that identifies the <tt>Segment</tt> amongst many o thers (128 bits). It is equivalent to a Universally Unique Identifier (UUID) v4 <xref target="RFC4122"></xref> with all bits randomly (or pseudorandomly) chosen . An actual UUID v4 value, where some bits are not random, <bcp14>MAY</bcp14> a lso be used.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the Segment is a part of a Linked Segment, then this Element is <bcp14>RE <dd>If the <tt>Segment</tt> is a part of a <tt>Linked Segment</tt>, then this El
QUIRED</bcp14>. ement is <bcp14>REQUIRED</bcp14>.
The value of the unique ID <bcp14>MUST</bcp14> contain at least one bit set to 1 The value of the UID <bcp14>MUST</bcp14> contain at least one bit set to 1.</dd>
.</dd>
</dl> </dl>
</section> </section>
<section anchor="segmentfilename-element"><name>SegmentFilename Element</name> <section anchor="segmentfilename-element"><name>SegmentFilename Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x7384 / utf-8</dd> <dd>0x7384 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\SegmentFilename</tt></dd> <dd><tt>\Segment\Info\SegmentFilename</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A filename corresponding to this Segment.</dd> <dd>A filename corresponding to this <tt>Segment</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="prevuuid-element"><name>PrevUUID Element</name> <section anchor="prevuuid-element"><name>PrevUUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x3CB923 / binary</dd> <dd>0x3CB923 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>16</dd> <dd>16</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\PrevUUID</tt></dd> <dd><tt>\Segment\Info\PrevUUID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>An ID to identify the previous Segment of a Linked Segment.</dd> <dd>An ID that identifies the previous <tt>Segment</tt> of a <tt>Linked Segment< /tt>.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the Segment is a part of a Linked Segment that uses Hard Linking (<xref t <dd>If the <tt>Segment</tt> is a part of a <tt>Linked Segment</tt> that uses
arget="hard-linking"></xref>), Hard Linking (<xref target="hard-linking"></xref>), then either the
then either the PrevUUID or the NextUUID Element is <bcp14>REQUIRED</bcp14>. If <tt>PrevUUID</tt> or the <tt>NextUUID</tt> Element is
a Segment contains a PrevUUID but not a NextUUID, <bcp14>REQUIRED</bcp14>. If a <tt>Segment</tt> contains a <tt>PrevUUID</tt>
then it <bcp14>MAY</bcp14> be considered as the last Segment of the Linked Segme but not a <tt>NextUUID</tt>, then it <bcp14>MAY</bcp14> be considered as the
nt. The PrevUUID <bcp14>MUST NOT</bcp14> be equal to the SegmentUUID.</dd> last <tt>Segment</tt> of the <tt>Linked Segment</tt>. The <tt>PrevUUID</tt> <bcp
14>MUST
NOT</bcp14> be equal to the <tt>SegmentUUID</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="prevfilename-element"><name>PrevFilename Element</name> <section anchor="prevfilename-element"><name>PrevFilename Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x3C83AB / utf-8</dd> <dd>0x3C83AB / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\PrevFilename</tt></dd> <dd><tt>\Segment\Info\PrevFilename</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A filename corresponding to the file of the previous Linked Segment.</dd> <dd>A filename corresponding to the file of the previous <tt>Linked Segment</tt> .</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>Provision of the previous filename is for display convenience, <dd>Provision of the previous filename is for display convenience,
but PrevUUID <bcp14>SHOULD</bcp14> be considered authoritative for identifying t he previous Segment in a Linked Segment.</dd> but <tt>PrevUUID</tt> <bcp14>SHOULD</bcp14> be considered authoritative for iden tifying the previous <tt>Segment</tt> in a <tt>Linked Segment</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="nextuuid-element"><name>NextUUID Element</name> <section anchor="nextuuid-element"><name>NextUUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x3EB923 / binary</dd> <dd>0x3EB923 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>16</dd> <dd>16</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\NextUUID</tt></dd> <dd><tt>\Segment\Info\NextUUID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>An ID to identify the next Segment of a Linked Segment.</dd> <dd>An ID that identifies the next <tt>Segment</tt> of a <tt>Linked Segment</tt> .</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the Segment is a part of a Linked Segment that uses Hard Linking (<xref t <dd>If the <tt>Segment</tt> is a part of a <tt>Linked Segment</tt> that uses Har
arget="hard-linking"></xref>), d Linking (<xref target="hard-linking"></xref>),
then either the PrevUUID or the NextUUID Element is <bcp14>REQUIRED</bcp14>. If then either the <tt>PrevUUID</tt> or the <tt>NextUUID</tt> Element is <bcp14>REQ
a Segment contains a NextUUID but not a PrevUUID, UIRED</bcp14>. If a <tt>Segment</tt> contains a <tt>NextUUID</tt> but not a <tt>
then it <bcp14>MAY</bcp14> be considered as the first Segment of the Linked Segm PrevUUID</tt>,
ent. The NextUUID <bcp14>MUST NOT</bcp14> be equal to the SegmentUUID.</dd> then it <bcp14>MAY</bcp14> be considered as the first <tt>Segment</tt> of the <t
t>Linked Segment</tt>. The <tt>NextUUID</tt> <bcp14>MUST NOT</bcp14> be equal to
the <tt>SegmentUUID</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="nextfilename-element"><name>NextFilename Element</name> <section anchor="nextfilename-element"><name>NextFilename Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x3E83BB / utf-8</dd> <dd>0x3E83BB / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\NextFilename</tt></dd> <dd><tt>\Segment\Info\NextFilename</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A filename corresponding to the file of the next Linked Segment.</dd> <dd>A filename corresponding to the file of the next <tt>Linked Segment</tt>.</d d>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>Provision of the next filename is for display convenience, <dd>Provision of the next filename is for display convenience,
but NextUUID <bcp14>SHOULD</bcp14> be considered authoritative for identifying t he Next Segment.</dd> but <tt>NextUUID</tt> <bcp14>SHOULD</bcp14> be considered authoritative for iden tifying the Next <tt>Segment</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="segmentfamily-element"><name>SegmentFamily Element</name> <section anchor="segmentfamily-element"><name>SegmentFamily Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4444 / binary</dd> <dd>0x4444 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>16</dd> <dd>16</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\SegmentFamily</tt></dd> <dd><tt>\Segment\Info\SegmentFamily</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID that all Segments of a Linked Segment <bcp14>MUST</bcp14> share (128 bits). It is equivalent to a UUID v4 <xref target="RFC4122"></xref> with al l bits randomly (or pseudo-randomly) chosen. An actual UUID v4 value, where some bits are not random, <bcp14>MAY</bcp14> also be used.</dd> <dd>A UID that all <tt>Segments</tt> of a <tt>Linked Segment</tt> <bcp14>MUST</b cp14> share (128 bits). It is equivalent to a UUID v4 <xref target="RFC4122"></x ref> with all bits randomly (or pseudorandomly) chosen. An actual UUID v4 value, where some bits are not random, <bcp14>MAY</bcp14> also be used.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the Segment Info contains a <tt>ChapterTranslate</tt> element, this Eleme nt is <bcp14>REQUIRED</bcp14>.</dd> <dd>If the <tt>Segment</tt> <tt>Info</tt> contains a <tt>ChapterTranslate</tt> e lement, this Element is <bcp14>REQUIRED</bcp14>.</dd>
</dl> </dl>
</section> </section>
<section anchor="chaptertranslate-element"><name>ChapterTranslate Element</name> <section anchor="chaptertranslate-element"><name>ChapterTranslate Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6924 / master</dd> <dd>0x6924 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\ChapterTranslate</tt></dd> <dd><tt>\Segment\Info\ChapterTranslate</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The mapping between this <tt>Segment</tt> and a segment value in the given C <dd>The mapping between this <tt>Segment</tt> and a
hapter Codec.</dd> segment value in the given Chapter Codec.</dd>
<dt>rationale:</dt> <dt>rationale:</dt>
<dd>Chapter Codec may need to address different segments, but they may not know <dd>Chapter Codecs may need to address different segments, but they may not know
of the way to identify such segment when stored in Matroska. of the way to identify such segments when stored in Matroska.
This element and its child elements add a way to map the internal segments known This element and its child elements add a way to map the internal segments known
to the Chapter Codec to the Segment IDs in Matroska. to the Chapter Codec to the <tt>Segment</tt> IDs in Matroska.
This allows remuxing a file with Chapter Codec without changing the content of t This allows remuxing a file with Chapter Codec without changing the content of t
he codec data, just the Segment mapping.</dd> he codec data, just the <tt>Segment</tt> mapping.</dd>
</dl> </dl>
<section anchor="chaptertranslateid-element"><name>ChapterTranslateID Element</n ame> <section anchor="chaptertranslateid-element"><name>ChapterTranslateID Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x69A5 / binary</dd> <dd>0x69A5 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateID</tt></dd> <dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The binary value used to represent this Segment in the chapter codec data. <dd>The binary value used to represent this <tt>Segment</tt> in the chapter code
The format depends on the ChapProcessCodecID used; see <xref target="chapprocess c data.
codecid-element"></xref>.</dd> The format depends on the <tt>ChapProcessCodecID</tt> used; see <xref target="ch
approcesscodecid-element"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="chaptertranslatecodec-element"><name>ChapterTranslateCodec Elem ent</name> <section anchor="chaptertranslatecodec-element"><name>ChapterTranslateCodec Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x69BF / uinteger</dd> <dd>0x69BF / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateCodec</tt></dd> <dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateCodec</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>This <tt>ChapterTranslate</tt> applies to this chapter codec of the given ch <dd>This <tt>ChapterTranslate</tt> applies to the chapter codec of the given cha
apter edition(s); see <xref target="chapprocesscodecid-element"></xref>.</dd> pter edition(s); see <xref target="chapprocesscodecid-element"></xref>.</dd>
<dt>defined values:</dt>
<dd>See <xref target="ChapterTranslateCodecValues"/>.</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="ChapterTranslateCodecValues"><name>ChapterTranslateCodec Values</
<table anchor="ChapterTranslateCodecValues"><name>ChapterTranslateCodec values</ name>
name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 794 skipping to change at line 857
<td align="left">Matroska Script</td> <td align="left">Matroska Script</td>
<td align="left">Chapter commands using the Matroska Script codec.</td> <td align="left">Chapter commands using the Matroska Script codec.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">DVD-menu</td> <td align="left">DVD-menu</td>
<td align="left">Chapter commands using the DVD-like codec.</td> <td align="left">Chapter commands using the DVD-like codec.</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="chaptertranslateeditionuid-element"><name>ChapterTranslateEditi onUID Element</name> <section anchor="chaptertranslateeditionuid-element"><name>ChapterTranslateEditi onUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x69FC / uinteger</dd> <dd>0x69FC / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateEditionUID</tt></dd> <dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateEditionUID</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify a chapter edition UID on which this <tt>ChapterTranslate</tt> applie s.</dd> <dd>Specifies a chapter edition UID to which this <tt>ChapterTranslate</tt> appl ies.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>When no <tt>ChapterTranslateEditionUID</tt> is specified in the <tt>ChapterT ranslate</tt>, the <tt>ChapterTranslate</tt> applies to all chapter editions fou nd in the Segment using the given <tt>ChapterTranslateCodec</tt>.</dd> <dd>When no <tt>ChapterTranslateEditionUID</tt> is specified in the <tt>ChapterT ranslate</tt>, the <tt>ChapterTranslate</tt> applies to all chapter editions fou nd in the <tt>Segment</tt> using the given <tt>ChapterTranslateCodec</tt>.</dd>
</dl> </dl>
</section> </section>
</section> </section>
<section anchor="timestampscale-element"><name>TimestampScale Element</name> <section anchor="timestampscale-element"><name>TimestampScale Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x2AD7B1 / uinteger / 1000000</dd> <dd>0x2AD7B1 / uinteger / 1000000</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\TimestampScale</tt></dd> <dd><tt>\Segment\Info\TimestampScale</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Base unit for Segment Ticks and Track Ticks, in nanoseconds. A TimestampScal e value of 1000000 means scaled timestamps in the Segment are expressed in milli seconds; see <xref target="timestamps"></xref> on how to interpret timestamps.</ dd> <dd>Base unit for Segment Ticks and Track Ticks, in nanoseconds. A <tt>Timestamp Scale</tt> value of 1000000 means scaled timestamps in the <tt>Segment</tt> are expressed in milliseconds; see <xref target="timestamps"></xref> on how to inter pret timestamps.</dd>
</dl> </dl>
</section> </section>
<section anchor="duration-element"><name>Duration Element</name> <section anchor="duration-element"><name>Duration Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4489 / float</dd> <dd>0x4489 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt; 0x0p+0</dd> <dd>&gt; 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\Duration</tt></dd> <dd><tt>\Segment\Info\Duration</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Duration of the Segment, expressed in Segment Ticks which is based on Timest ampScale; see <xref target="timestamp-ticks"></xref>.</dd> <dd>Duration of the <tt>Segment</tt>, expressed in Segment Ticks, which are base d on <tt>TimestampScale</tt>; see <xref target="timestamp-ticks"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="dateutc-element"><name>DateUTC Element</name> <section anchor="dateutc-element"><name>DateUTC Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4461 / date</dd> <dd>0x4461 / date</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\DateUTC</tt></dd> <dd><tt>\Segment\Info\DateUTC</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The date and time that the Segment was created by the muxing application or library.</dd> <dd>The date and time that the <tt>Segment</tt> was created by the muxing applic ation or library.</dd>
</dl> </dl>
</section> </section>
<section anchor="title-element"><name>Title Element</name> <section anchor="title-element"><name>Title Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x7BA9 / utf-8</dd> <dd>0x7BA9 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\Title</tt></dd> <dd><tt>\Segment\Info\Title</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>General name of the Segment.</dd> <dd>General name of the <tt>Segment</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="muxingapp-element"><name>MuxingApp Element</name> <section anchor="muxingapp-element"><name>MuxingApp Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4D80 / utf-8</dd> <dd>0x4D80 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\MuxingApp</tt></dd> <dd><tt>\Segment\Info\MuxingApp</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Muxing application or library (example: &quot;libmatroska-0.4.3&quot;).</dd> <dd>Muxing application or library (example: "libmatroska-0.4.3").</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>Include the full name of the application or library followed by the version number.</dd> <dd>Include the full name of the application or library followed by the version number.</dd>
</dl> </dl>
</section> </section>
<section anchor="writingapp-element"><name>WritingApp Element</name> <section anchor="writingapp-element"><name>WritingApp Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x5741 / utf-8</dd> <dd>0x5741 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\WritingApp</tt></dd> <dd><tt>\Segment\Info\WritingApp</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Writing application (example: &quot;mkvmerge-0.3.3&quot;).</dd> <dd>Writing application (example: "mkvmerge-0.3.3").</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>Include the full name of the application followed by the version number.</dd > <dd>Include the full name of the application followed by the version number.</dd >
</dl> </dl>
</section> </section>
</section> </section>
<section anchor="cluster-element"><name>Cluster Element</name> <section anchor="cluster-element"><name>Cluster Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1F43B675 / master</dd> <dd>0x1F43B675 / master</dd>
</dl> <dt>unknownsizeallowed:</dt>
<t>unknownsizeallowed: True</t> <dd>True</dd>
<dl spacing="compact">
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster</tt></dd> <dd><tt>\Segment\Cluster</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Top-Level Element containing the (monolithic) Block structure.</dd> <dd>The Top-Level Element containing the (monolithic) <tt>Block</tt> structure.< /dd>
</dl> </dl>
<section anchor="timestamp-element"><name>Timestamp Element</name> <section anchor="timestamp-element"><name>Timestamp Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE7 / uinteger</dd> <dd>0xE7 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\Timestamp</tt></dd> <dd><tt>\Segment\Cluster\Timestamp</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Absolute timestamp of the cluster, expressed in Segment Ticks which is based on TimestampScale; see <xref target="timestamp-ticks"></xref>.</dd> <dd>Absolute timestamp of the cluster, expressed in Segment Ticks, which are bas ed on <tt>TimestampScale</tt>; see <xref target="timestamp-ticks"></xref>.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>This element <bcp14>SHOULD</bcp14> be the first child element of the Cluster <dd>This element <bcp14>SHOULD</bcp14> be the first child element of the <tt>Clu
it belongs to, ster</tt> it belongs to or the second if that <tt>Cluster</tt> contains a CRC-32
or the second if that Cluster contains a CRC-32 element (<xref target="crc-32">< element (<xref target="crc-32"></xref>).</dd>
/xref>).</dd>
</dl> </dl>
</section> </section>
<section anchor="position-element"><name>Position Element</name> <section anchor="position-element"><name>Position Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA7 / uinteger</dd> <dd>0xA7 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\Position</tt></dd> <dd><tt>\Segment\Cluster\Position</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>maxver:</dt> <dt>maxver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Segment Position of the Cluster in the Segment (0 in live streams). <dd>The <tt>Segment Position</tt> of the <tt>Cluster</tt> in the <tt>Segment</tt
It might help to resynchronise offset on damaged streams.</dd> > (0 in live streams).
It might help to resynchronize the offset on damaged streams.</dd>
</dl> </dl>
</section> </section>
<section anchor="prevsize-element"><name>PrevSize Element</name> <section anchor="prevsize-element"><name>PrevSize Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xAB / uinteger</dd> <dd>0xAB / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\PrevSize</tt></dd> <dd><tt>\Segment\Cluster\PrevSize</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Size of the previous Cluster, in octets. Can be useful for backward playing. </dd> <dd>Size of the previous <tt>Cluster</tt>, in octets. Can be useful for backward playing.</dd>
</dl> </dl>
</section> </section>
<section anchor="simpleblock-element"><name>SimpleBlock Element</name> <section anchor="simpleblock-element"><name>SimpleBlock Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA3 / binary</dd> <dd>0xA3 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\SimpleBlock</tt></dd> <dd><tt>\Segment\Cluster\SimpleBlock</tt></dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Similar to Block, see <xref target="block-structure"></xref>, but without al
l the extra information, <dd>Similar to <tt>Block</tt> (see <xref target="block-structure"></xref>) but w
mostly used to reduced overhead when no extra feature is needed; see <xref targe ithout all the extra information.
t="simpleblock-structure"></xref> on SimpleBlock Structure.</dd> Mostly used to reduce overhead when no extra feature is needed; see <xref target
="simpleblock-structure"></xref> on <tt>SimpleBlock</tt> Structure.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockgroup-element"><name>BlockGroup Element</name> <section anchor="blockgroup-element"><name>BlockGroup Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA0 / master</dd> <dd>0xA0 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Basic container of information containing a single Block and information spe cific to that Block.</dd> <dd>Basic container of information containing a single <tt>Block</tt> and inform ation specific to that <tt>Block</tt>.</dd>
</dl> </dl>
<section anchor="block-element"><name>Block Element</name> <section anchor="block-element"><name>Block Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA1 / binary</dd> <dd>0xA1 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\Block</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\Block</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Block containing the actual data to be rendered and a timestamp relative to <dd><tt>Block</tt> containing the actual data to be rendered and a timestamp rel
the Cluster Timestamp; ative to the <tt>Cluster</tt> Timestamp;
see <xref target="block-structure"></xref> on Block Structure.</dd> see <xref target="block-structure"></xref> on <tt>Block</tt> Structure.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockadditions-element"><name>BlockAdditions Element</name> <section anchor="blockadditions-element"><name>BlockAdditions Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x75A1 / master</dd> <dd>0x75A1 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contain additional binary data to complete the main one; see Codec BlockAddi <dd>Contains additional binary data to complete the <tt>Block</tt> element; see
tions section of <xref target="MatroskaCodec"></xref> for more information. <xref
An EBML parser that has no knowledge of the Block structure could still see and target="I-D.ietf-cellar-codec" sectionFormat="of" section="4.1.5" ></xref> for m
use/skip these data.</dd> ore information.
An EBML parser that has no knowledge of the <tt>Block</tt> structure could still
see and use/skip these data.</dd>
</dl> </dl>
<section anchor="blockmore-element"><name>BlockMore Element</name> <section anchor="blockmore-element"><name>BlockMore Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA6 / master</dd> <dd>0xA6 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contain the BlockAdditional and some parameters.</dd> <dd>Contains the <tt>BlockAdditional</tt> and some parameters.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockadditional-element"><name>BlockAdditional Element</name> <section anchor="blockadditional-element"><name>BlockAdditional Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA5 / binary</dd> <dd>0xA5 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore\BlockAdditional</tt ></dd> <dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore\BlockAdditional</tt ></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Interpreted by the codec as it wishes (using the BlockAddID).</dd> <dd>Interpreted by the codec as it wishes (using the <tt>BlockAddID</tt>).</dd>
</dl> </dl>
</section> </section>
<section anchor="blockaddid-element"><name>BlockAddID Element</name> <section anchor="blockaddid-element"><name>BlockAddID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0xEE / uinteger / 1</dd> <dd>0xEE / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore\BlockAddID</tt></dd > <dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore\BlockAddID</tt></dd >
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>An ID to identify how to interpret the BlockAdditional data; see Codec Block <dd>An ID that identifies how to interpret the <tt>BlockAdditional</tt> data; se
Additions section of <xref target="MatroskaCodec"></xref> for more information. e <xref
A value of 1 indicates that the meaning of the BlockAdditional data is defined b target="I-D.ietf-cellar-codec" sectionFormat="of" section="4.1.5" ></xref> for
y the codec. more information. A value of 1 indicates that the <tt>BlockAdditional</tt> data
Any other value indicates the meaning of the BlockAdditional data is found in th is
e BlockAddIDType found in the TrackEntry.</dd> defined by the codec. Any other value indicates that the <tt>BlockAdditional</tt
<dt>usage notes:</dt> > data
<dd>Each BlockAddID value <bcp14>MUST</bcp14> be unique between all BlockMore el should be handled according to the <tt>BlockAddIDType</tt> that is located in th
ements found in a BlockAdditions.</dd> e
<tt>TrackEntry</tt>.
</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>To keep MaxBlockAdditionID as low as possible, small values <bcp14>SHOULD</b cp14> be used.</dd> <dd>Each <tt>BlockAddID</tt> value <bcp14>MUST</bcp14> be unique between all <tt >BlockMore</tt> elements found in a <tt>BlockAdditions</tt> element. To keep <tt >MaxBlockAdditionID</tt> as low as possible, small values <bcp14>SHOULD</bcp14> be used.</dd>
</dl> </dl>
</section> </section>
</section> </section>
<section anchor="blockduration-element"><name>BlockDuration Element</name> <section anchor="blockduration-element"><name>BlockDuration Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x9B / uinteger</dd> <dd>0x9B / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\BlockDuration</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\BlockDuration</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>see implementation notes / 1</dd> <dd>See <xref target="BlockDurationNotes"/> / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The duration of the Block, expressed in Track Ticks; see <xref target="times <dd>The duration of the <tt>Block</tt>, expressed in Track Ticks; see <xref targ
tamp-ticks"></xref>. et="timestamp-ticks"></xref>.
The BlockDuration Element can be useful at the end of a Track to define the dura The <tt>BlockDuration</tt> Element can be useful at the end of a <tt>Track</tt>
tion of the last frame (as there is no subsequent Block available), to define the duration of the last frame (as there is no subsequent <tt>Block</t
t> available)
or when there is a break in a track like for subtitle tracks.</dd> or when there is a break in a track like for subtitle tracks.</dd>
<dt>notes:</dt>
<dd>See <xref target="BlockDurationNotes"/>.</dd>
</dl> </dl>
<t>notes:</t> <table anchor="BlockDurationNotes"><name>BlockDuration Implementation Notes</nam
<table anchor="BlockDurationNotes"><name>BlockDuration implementation notes</nam e>
e>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">minOccurs</td> <td align="left">minOccurs</td>
<td align="left">BlockDuration <bcp14>MUST</bcp14> be set (minOccurs=1) if the a <td align="left">BlockDuration <bcp14>MUST</bcp14> be set (minOccurs=1) if the a
ssociated TrackEntry stores a DefaultDuration value.</td> ssociated
TrackEntry stores a DefaultDuration value.</td>
</tr> </tr>
<tr> <tr>
<td align="left">default</td> <td align="left">default</td>
<td align="left">When not written and with no DefaultDuration, the value is assu <td align="left">If a value is not present and no DefaultDuration is defined,
med to be the difference between the timestamp of this Block and the timestamp o the value is assumed to be the difference between the timestamp of this Block>
f the next Block in &quot;display&quot; order (not coding order).</td> and the timestamp of the next Block in "display" order (not coding
order).</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="referencepriority-element"><name>ReferencePriority Element</nam e> <section anchor="referencepriority-element"><name>ReferencePriority Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0xFA / uinteger / 0</dd> <dd>0xFA / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\ReferencePriority</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\ReferencePriority</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>This frame is referenced and has the specified cache priority. <dd>This frame is referenced and has the specified cache priority.
In cache only a frame of the same or higher priority can replace this frame. A v alue of 0 means the frame is not referenced.</dd> In the cache, only a frame of the same or higher priority can replace this frame . A value of 0 means the frame is not referenced.</dd>
</dl> </dl>
</section> </section>
<section anchor="referenceblock-element"><name>ReferenceBlock Element</name> <section anchor="referenceblock-element"><name>ReferenceBlock Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xFB / integer</dd> <dd>0xFB / integer</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\ReferenceBlock</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\ReferenceBlock</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A timestamp value, relative to the timestamp of the Block in this BlockGroup , expressed in Track Ticks; see <xref target="timestamp-ticks"></xref>. <dd><t>A timestamp value, relative to the timestamp of the <tt>Block</tt> in thi s <tt>BlockGroup</tt>, expressed in Track Ticks; see <xref target="timestamp-tic ks"></xref>.
This is used to reference other frames necessary to decode this frame. This is used to reference other frames necessary to decode this frame.
The relative value <bcp14>SHOULD</bcp14> correspond to a valid <tt>Block</tt> th The relative value <bcp14>SHOULD</bcp14> correspond to a valid <tt>Block</tt> th
is <tt>Block</tt> depends on. at this <tt>Block</tt> depends on.
Historically Matroska Writer didn't write the actual <tt>Block(s)</tt> this <tt> Historically, Matroska Writers didn't write the actual <tt>Block(s)</tt> that th
Block</tt> depends on, but <em>some</em> <tt>Block</tt> in the past.</dd> is <tt>Block</tt> depends on, but they did write <em>some</em> <tt>Block(s)</tt>
in the past.
The value "0" <bcp14>MAY</bcp14> also be used to signify that this <tt>Block</tt
> cannot be decoded on its own, but the necessary reference <tt>Block(s)</tt> is
unknown. In this case, other <tt>ReferenceBlock</tt> Elements <bcp14>MUST NOT</
bcp14> be found in the same <tt>BlockGroup</tt>. If the <tt>BlockGroup</tt> does
n't have a <tt>ReferenceBlock</tt> element, then the <tt>Block</tt> it contains
can be decoded without using any other <tt>Block</tt> data.</t></dd>
</dl> </dl>
<t>The value &quot;0&quot; <bcp14>MAY</bcp14> also be used to signify this <tt>B
lock</tt> cannot be decoded on its own, but without knownledge of which <tt>Bloc
k</tt> is necessary. In this case, other <tt>ReferenceBlock</tt> <bcp14>MUST NOT
</bcp14> be found in the same <tt>BlockGroup</tt>.</t>
<t>If the <tt>BlockGroup</tt> doesn't have any <tt>ReferenceBlock</tt> element,
then the <tt>Block</tt> it contains can be decoded without using any other <tt>B
lock</tt> data.</t>
</section> </section>
<section anchor="codecstate-element"><name>CodecState Element</name> <section anchor="codecstate-element"><name>CodecState Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA4 / binary</dd> <dd>0xA4 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\CodecState</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\CodecState</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
skipping to change at line 1171 skipping to change at line 1241
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x75A2 / integer</dd> <dd>0x75A2 / integer</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\DiscardPadding</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\DiscardPadding</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Duration of the silent data added to the Block, expressed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="timestamp-ticks"></xref> <dd>Duration of the silent data added to the Block, expressed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="timestamp-ticks"></xref>
(padding at the end of the Block for positive value, at the beginning of the Blo (padding at the end of the <tt>Block</tt> for positive values and at the beginni
ck for negative value). ng of the <tt>Block</tt> for negative values).
The duration of DiscardPadding is not calculated in the duration of the TrackEnt The duration of <tt>DiscardPadding</tt> is not calculated in the duration of the
ry and <bcp14>SHOULD</bcp14> be discarded during playback.</dd> <tt>TrackEntry</tt>and <bcp14>SHOULD</bcp14> be discarded during playback.</dd>
</dl> </dl>
</section> </section>
</section> </section>
</section> </section>
<section anchor="tracks-element"><name>Tracks Element</name> <section anchor="tracks-element"><name>Tracks Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1654AE6B / master</dd> <dd>0x1654AE6B / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks</tt></dd> <dd><tt>\Segment\Tracks</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
</dl> <dt>recurring:</dt><dd>True</dd>
<t>recurring: True</t>
<dl spacing="compact">
<dt>definition:</dt> <dt>definition:</dt>
<dd>A Top-Level Element of information with many tracks described.</dd> <dd>A Top-Level Element of information with many tracks described.</dd>
</dl> </dl>
<section anchor="trackentry-element"><name>TrackEntry Element</name> <section anchor="trackentry-element"><name>TrackEntry Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xAE / master</dd> <dd>0xAE / master</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 1220 skipping to change at line 1287
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xD7 / uinteger</dd> <dd>0xD7 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackNumber</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackNumber</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The track number as used in the Block Header.</dd> <dd>The track number as used in the <tt>Block</tt> Header.</dd>
</dl> </dl>
</section> </section>
<section anchor="trackuid-element"><name>TrackUID Element</name> <section anchor="trackuid-element"><name>TrackUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x73C5 / uinteger</dd> <dd>0x73C5 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackUID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the Track.</dd> <dd>A UID that identifies the <tt>Track</tt>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="tracktype-element"><name>TrackType Element</name> <section anchor="tracktype-element"><name>TrackType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x83 / uinteger</dd> <dd>0x83 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackType</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackType</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The <tt>TrackType</tt> defines the type of each frame found in the Track. <dd>The <tt>TrackType</tt> defines the type of each frame found in the <tt>Track </tt>.
The value <bcp14>SHOULD</bcp14> be stored on 1 octet.</dd> The value <bcp14>SHOULD</bcp14> be stored on 1 octet.</dd>
<dt>defined values:</dt>
<dd>See <xref target="TrackTypeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="TrackTypeValues"><name>TrackType Values</name>
<table anchor="TrackTypeValues"><name>TrackType values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">each frame contains</th> <th align="left">contents of each frame</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">video</td> <td align="left">video</td>
<td align="left">An image.</td> <td align="left">An image.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">audio</td> <td align="left">audio</td>
<td align="left">Audio samples.</td> <td align="left">Audio samples.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">complex</td> <td align="left">complex</td>
<td align="left">A mix of different other TrackType. The codec needs to define h ow the <tt>Matroska Player</tt> should interpret such data.</td> <td align="left">A mix of different other TrackType. The codec needs to define h ow the Matroska Player should interpret such data.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>16</tt></td> <td align="left"><tt>16</tt></td>
<td align="left">logo</td> <td align="left">logo</td>
<td align="left">An image to be rendered over the video track(s).</td> <td align="left">An image to be rendered over the video track(s).</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>17</tt></td> <td align="left"><tt>17</tt></td>
skipping to change at line 1304 skipping to change at line 1373
<tr> <tr>
<td align="left"><tt>18</tt></td> <td align="left"><tt>18</tt></td>
<td align="left">buttons</td> <td align="left">buttons</td>
<td align="left">Interactive button(s) to be rendered over the video track(s).</ td> <td align="left">Interactive button(s) to be rendered over the video track(s).</ td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>32</tt></td> <td align="left"><tt>32</tt></td>
<td align="left">control</td> <td align="left">control</td>
<td align="left">Metadata used to control the player of the <tt>Matroska Player< /tt>.</td> <td align="left">Metadata used to control the player of the Matroska Player.</td >
</tr> </tr>
<tr> <tr>
<td align="left"><tt>33</tt></td> <td align="left"><tt>33</tt></td>
<td align="left">metadata</td> <td align="left">metadata</td>
<td align="left">Timed metadata that can be passed on to the <tt>Matroska Player </tt>.</td> <td align="left">Timed metadata that can be passed on to the Matroska Player.</t d>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="flagenabled-element"><name>FlagEnabled Element</name> <section anchor="flagenabled-element"><name>FlagEnabled Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0xB9 / uinteger / 1</dd> <dd>0xB9 / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagEnabled</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagEnabled</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if the track is usable. It is possible to turn a not usable track i nto a usable track using chapter codecs or control tracks.</dd> <dd>Set to 1 if the track is usable. It is possible to turn a track that is not usable into a usable track using chapter codecs or control tracks.</dd>
</dl> </dl>
</section> </section>
<section anchor="flagdefault-element"><name>FlagDefault Element</name> <section anchor="flagdefault-element"><name>FlagDefault Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x88 / uinteger / 1</dd> <dd>0x88 / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagDefault</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagDefault</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set if that track (audio, video or subs) is eligible for automatic selection by the player; see <xref target="default-track-selection"></xref> for more deta ils.</dd> <dd>Set to 1 if the track (audio, video, or subtitles) is eligible for automatic selection by the player; see <xref target="default-track-selection"></xref> for more details.</dd>
</dl> </dl>
</section> </section>
<section anchor="flagforced-element"><name>FlagForced Element</name> <section anchor="flagforced-element"><name>FlagForced Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55AA / uinteger / 0</dd> <dd>0x55AA / uinteger / 0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagForced</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagForced</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Applies only to subtitles. Set if that track is eligible for automatic selec <dd>Applies only to subtitles. Set to 1 if the track is eligible for automatic s
tion by the player if it matches the user's language preference, election by the player if it matches the user's language preference,
even if the user's preferences would normally not enable subtitles with the sele even if the user's preferences would not normally enable subtitles with the sele
cted audio track; cted audio track;
this can be used for tracks containing only translations of foreign-language aud this can be used for tracks containing only translations of audio in foreign lan
io or onscreen text. guages or on-screen text.
See <xref target="default-track-selection"></xref> for more details.</dd> See <xref target="default-track-selection"></xref> for more details.</dd>
</dl> </dl>
</section> </section>
<section anchor="flaghearingimpaired-element"><name>FlagHearingImpaired Element< /name> <section anchor="flaghearingimpaired-element"><name>FlagHearingImpaired Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55AB / uinteger</dd> <dd>0x55AB / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagHearingImpaired</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagHearingImpaired</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if and only if that track is suitable for users with hearing impair ments.</dd> <dd>Set to 1 if and only if the track is suitable for users with hearing impairm ents.</dd>
</dl> </dl>
</section> </section>
<section anchor="flagvisualimpaired-element"><name>FlagVisualImpaired Element</n ame> <section anchor="flagvisualimpaired-element"><name>FlagVisualImpaired Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55AC / uinteger</dd> <dd>0x55AC / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagVisualImpaired</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagVisualImpaired</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if and only if that track is suitable for users with visual impairm ents.</dd> <dd>Set to 1 if and only if the track is suitable for users with visual impairme nts.</dd>
</dl> </dl>
</section> </section>
<section anchor="flagtextdescriptions-element"><name>FlagTextDescriptions Elemen t</name> <section anchor="flagtextdescriptions-element"><name>FlagTextDescriptions Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55AD / uinteger</dd> <dd>0x55AD / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagTextDescriptions</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagTextDescriptions</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if and only if that track contains textual descriptions of video co ntent.</dd> <dd>Set to 1 if and only if the track contains textual descriptions of video con tent.</dd>
</dl> </dl>
</section> </section>
<section anchor="flagoriginal-element"><name>FlagOriginal Element</name> <section anchor="flagoriginal-element"><name>FlagOriginal Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55AE / uinteger</dd> <dd>0x55AE / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagOriginal</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagOriginal</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if and only if that track is in the content's original language.</d d> <dd>Set to 1 if and only if the track is in the content's original language.</dd >
</dl> </dl>
</section> </section>
<section anchor="flagcommentary-element"><name>FlagCommentary Element</name> <section anchor="flagcommentary-element"><name>FlagCommentary Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55AF / uinteger</dd> <dd>0x55AF / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagCommentary</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagCommentary</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if and only if that track contains commentary.</dd> <dd>Set to 1 if and only if the track contains commentary.</dd>
</dl> </dl>
</section> </section>
<section anchor="flaglacing-element"><name>FlagLacing Element</name> <section anchor="flaglacing-element"><name>FlagLacing Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x9C / uinteger / 1</dd> <dd>0x9C / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagLacing</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagLacing</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if the track <bcp14>MAY</bcp14> contain blocks using lacing. When s <dd>Set to 1 if the track <bcp14>MAY</bcp14> contain blocks that use lacing.
et to 0 all blocks <bcp14>MUST</bcp14> have their lacing flags set to No lacing; When set to 0, all blocks <bcp14>MUST</bcp14> have their lacing flags set to "no
see <xref target="block-lacing"></xref> on Block Lacing.</dd> lacing"; see <xref target="block-lacing"></xref> on <tt>Block</tt> Lacing.</dd>
</dl> </dl>
</section> </section>
<section anchor="defaultduration-element"><name>DefaultDuration Element</name> <section anchor="defaultduration-element"><name>DefaultDuration Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x23E383 / uinteger</dd> <dd>0x23E383 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\DefaultDuration</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\DefaultDuration</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Number of nanoseconds per frame, expressed in Matroska Ticks -- i.e., in nan oseconds; see <xref target="timestamp-ticks"></xref> <dd>Number of nanoseconds per frame, expressed in Matroska Ticks -- i.e., in nan oseconds; see <xref target="timestamp-ticks"></xref>
(frame in the Matroska sense -- one Element put into a (Simple)Block).</dd> ("frame" in the Matroska sense -- one Element put into a (Simple)Block).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="defaultdecodedfieldduration-element"><name>DefaultDecodedFieldD uration Element</name> <section anchor="defaultdecodedfieldduration-element"><name>DefaultDecodedFieldD uration Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x234E7A / uinteger</dd> <dd>0x234E7A / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\DefaultDecodedFieldDuration</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\DefaultDecodedFieldDuration</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The period between two successive fields at the output of the decoding proce ss, expressed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="times tamp-ticks"></xref>. <dd>The period between two successive fields at the output of the decoding proce ss, expressed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="times tamp-ticks"></xref>.
see <xref target="defaultdecodedfieldduration"></xref> for more information</dd> See <xref target="defaultdecodedfieldduration"></xref> for more information.</dd
>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="tracktimestampscale-element"><name>TrackTimestampScale Element< /name> <section anchor="tracktimestampscale-element"><name>TrackTimestampScale Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x23314F / float / 0x1p+0</dd> <dd>0x23314F / float / 0x1p+0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt; 0x0p+0</dd> <dd>&gt; 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackTimestampScale</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackTimestampScale</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>maxver:</dt> <dt>maxver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The scale to apply on this track to work at normal speed in relation with ot her tracks <dd>The scale to apply on this track to work at normal speed in relation with ot her tracks
(mostly used to adjust video speed when the audio length differs).</dd> (mostly used to adjust video speed when the audio length differs).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="maxblockadditionid-element"><name>MaxBlockAdditionID Element</n ame> <section anchor="maxblockadditionid-element"><name>MaxBlockAdditionID Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55EE / uinteger / 0</dd> <dd>0x55EE / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\MaxBlockAdditionID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\MaxBlockAdditionID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The maximum value of BlockAddID (<xref target="blockaddid-element"></xref>). <dd>The maximum value of <tt>BlockAddID</tt> (<xref target="blockaddid-element">
A value 0 means there is no BlockAdditions (<xref target="blockadditions-element </xref>).
"></xref>) for this track.</dd> A value of 0 means there is no <tt>BlockAdditions</tt> (<xref target="blockaddit
ions-element"></xref>) for this track.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockadditionmapping-element"><name>BlockAdditionMapping Elemen t</name> <section anchor="blockadditionmapping-element"><name>BlockAdditionMapping Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x41E4 / master</dd> <dd>0x41E4 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping</tt></dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains elements that extend the track format, by adding content either to <dd>Contains elements that extend the track format by adding content either to e
each frame, ach frame,
with BlockAddID (<xref target="blockaddid-element"></xref>), or to the track as with <tt>BlockAddID</tt> (<xref target="blockaddid-element"></xref>), or to the
a whole track as a whole
with BlockAddIDExtraData.</dd> with <tt>BlockAddIDExtraData</tt>.</dd>
</dl> </dl>
<section anchor="blockaddidvalue-element"><name>BlockAddIDValue Element</name> <section anchor="blockaddidvalue-element"><name>BlockAddIDValue Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x41F0 / uinteger</dd> <dd>0x41F0 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;=2</dd> <dd>&gt;=2</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 1577 skipping to change at line 1648
<dd>0x41F0 / uinteger</dd> <dd>0x41F0 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;=2</dd> <dd>&gt;=2</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping\BlockAddIDValue</tt></dd > <dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping\BlockAddIDValue</tt></dd >
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>If the track format extension needs content beside frames, <dd>If the track format extension needs content beside frames,
the value refers to the BlockAddID (<xref target="blockaddid-element"></xref>), value being described.</dd> the value refers to the <tt>BlockAddID</tt> (<xref target="blockaddid-element">< /xref>) value being described.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>To keep MaxBlockAdditionID as low as possible, small values <bcp14>SHOULD</b cp14> be used.</dd> <dd>To keep <tt>MaxBlockAdditionID</tt> as low as possible, small values <bcp14> SHOULD</bcp14> be used.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockaddidname-element"><name>BlockAddIDName Element</name> <section anchor="blockaddidname-element"><name>BlockAddIDName Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x41A4 / string</dd> <dd>0x41A4 / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping\BlockAddIDName</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping\BlockAddIDName</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A human-friendly name describing the type of BlockAdditional data, <dd>A human-friendly name describing the type of <tt>BlockAdditional</tt> data,
as defined by the associated Block Additional Mapping.</dd> as defined by the associated Block Additional Mapping.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockaddidtype-element"><name>BlockAddIDType Element</name> <section anchor="blockaddidtype-element"><name>BlockAddIDType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x41E7 / uinteger / 0</dd> <dd>0x41E7 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping\BlockAddIDType</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping\BlockAddIDType</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Stores the registered identifier of the Block Additional Mapping <dd>Stores the registered identifier of the Block Additional Mapping
to define how the BlockAdditional data should be handled.</dd> to define how the <tt>BlockAdditional</tt> data should be handled.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If BlockAddIDType is 0, the BlockAddIDValue and corresponding BlockAddID val ues <bcp14>MUST</bcp14> be 1.</dd> <dd>If <tt>BlockAddIDType</tt> is 0, the <tt>BlockAddIDValue</tt> and correspond ing <tt>BlockAddID</tt> values <bcp14>MUST</bcp14> be 1.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockaddidextradata-element"><name>BlockAddIDExtraData Element< /name> <section anchor="blockaddidextradata-element"><name>BlockAddIDExtraData Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x41ED / binary</dd> <dd>0x41ED / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping\BlockAddIDExtraData</tt> </dd> <dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping\BlockAddIDExtraData</tt> </dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Extra binary data that the BlockAddIDType can use to interpret the BlockAddi <dd>Extra binary data that the <tt>BlockAddIDType</tt> can use to interpret the
tional data. <tt>BlockAdditional</tt> data.
The interpretation of the binary data depends on the BlockAddIDType value and th The interpretation of the binary data depends on the <tt>BlockAddIDType</tt> val
e corresponding Block Additional Mapping.</dd> ue and the corresponding Block Additional Mapping.</dd>
</dl> </dl>
</section> </section>
</section> </section>
<section anchor="name-element"><name>Name Element</name> <section anchor="name-element"><name>Name Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x536E / utf-8</dd> <dd>0x536E / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 1664 skipping to change at line 1736
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x22B59C / string / eng</dd> <dd>0x22B59C / string / eng</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Language</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Language</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The language of the track, <dd>The language of the track,
in the Matroska languages form; see <xref target="language-codes"></xref> on lan guage codes. in the Matroska languages form; see <xref target="language-codes"></xref> on lan guage codes.
This Element <bcp14>MUST</bcp14> be ignored if the LanguageBCP47 Element is used in the same TrackEntry.</dd> This Element <bcp14>MUST</bcp14> be ignored if the <tt>LanguageBCP47</tt> Elemen t is used in the same <tt>TrackEntry</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="languagebcp47-element"><name>LanguageBCP47 Element</name> <section anchor="languagebcp47-element"><name>LanguageBCP47 Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x22B59D / string</dd> <dd>0x22B59D / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\LanguageBCP47</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\LanguageBCP47</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The language of the track, <dd>The language of the track,
in the <xref target="BCP47"></xref> form; see <xref target="language-codes"></xr in the form defined in <xref target="RFC5646"></xref>; see <xref target="languag
ef> on language codes. e-codes"></xref> on language codes.
If this Element is used, then any Language Elements used in the same TrackEntry If this Element is used, then any <tt>Language</tt> Elements used in the same <t
<bcp14>MUST</bcp14> be ignored.</dd> t>TrackEntry</tt><bcp14>MUST</bcp14> be ignored.</dd>
</dl> </dl>
</section> </section>
<section anchor="codecid-element"><name>CodecID Element</name> <section anchor="codecid-element"><name>CodecID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x86 / string</dd> <dd>0x86 / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\CodecID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\CodecID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>An ID corresponding to the codec, <dd>An ID corresponding to the codec;
see <xref target="MatroskaCodec"></xref> for more info.</dd> see <xref target="I-D.ietf-cellar-codec"></xref> for more info.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="codecprivate-element"><name>CodecPrivate Element</name> <section anchor="codecprivate-element"><name>CodecPrivate Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x63A2 / binary</dd> <dd>0x63A2 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\CodecPrivate</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\CodecPrivate</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Private data only known to the codec.</dd> <dd>Private data only known to the codec.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="codecname-element"><name>CodecName Element</name> <section anchor="codecname-element"><name>CodecName Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x258688 / utf-8</dd> <dd>0x258688 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\CodecName</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\CodecName</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
skipping to change at line 1763 skipping to change at line 1835
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x56AA / uinteger / 0</dd> <dd>0x56AA / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\CodecDelay</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\CodecDelay</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>CodecDelay is The codec-built-in delay, expressed in Matroska Ticks -- i.e., <dd>The built-in delay for the codec, expressed in Matroska Ticks -- i.e., in na
in nanoseconds; see <xref target="timestamp-ticks"></xref>. noseconds; see <xref target="timestamp-ticks"></xref>.
It represents the amount of codec samples that will be discarded by the decoder It represents the number of codec samples that will be discarded by the decoder
during playback. during playback.
This timestamp value <bcp14>MUST</bcp14> be subtracted from each frame timestamp in order to get the timestamp that will be actually played. This timestamp value <bcp14>MUST</bcp14> be subtracted from each frame timestamp in order to get the timestamp that will be actually played.
The value <bcp14>SHOULD</bcp14> be small so the muxing of tracks with the same a The value <bcp14>SHOULD</bcp14> be small so the muxing of tracks with the same a
ctual timestamp are in the same Cluster.</dd> ctual timestamp are in the same <tt>Cluster</tt>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="seekpreroll-element"><name>SeekPreRoll Element</name> <section anchor="seekpreroll-element"><name>SeekPreRoll Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x56BB / uinteger / 0</dd> <dd>0x56BB / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\SeekPreRoll</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\SeekPreRoll</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>After a discontinuity, SeekPreRoll is the duration of the data <dd>After a discontinuity, the duration of the data
the decoder <bcp14>MUST</bcp14> decode before the decoded data is valid, express that the decoder <bcp14>MUST</bcp14> decode before the decoded data is valid, ex
ed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="timestamp-ticks" pressed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="timestamp-t
></xref>.</dd> icks"></xref>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="tracktranslate-element"><name>TrackTranslate Element</name> <section anchor="tracktranslate-element"><name>TrackTranslate Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6624 / master</dd> <dd>0x6624 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The mapping between this <tt>TrackEntry</tt> and a track value in the given Chapter Codec.</dd> <dd>The mapping between this <tt>TrackEntry</tt> and a track value in the given Chapter Codec.</dd>
<dt>rationale:</dt> <dt>rationale:</dt>
<dd>Chapter Codec may need to address content in specific track, but they may no t know of the way to identify tracks in Matroska. <dd>Chapter Codecs may need to address content in a specific track, but they may not know of the way to identify tracks in Matroska.
This element and its child elements add a way to map the internal tracks known t o the Chapter Codec to the track IDs in Matroska. This element and its child elements add a way to map the internal tracks known t o the Chapter Codec to the track IDs in Matroska.
This allows remuxing a file with Chapter Codec without changing the content of t he codec data, just the track mapping.</dd> This allows remuxing a file with Chapter Codec without changing the content of t he codec data, just the track mapping.</dd>
</dl> </dl>
<section anchor="tracktranslatetrackid-element"><name>TrackTranslateTrackID Elem ent</name> <section anchor="tracktranslatetrackid-element"><name>TrackTranslateTrackID Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x66A5 / binary</dd> <dd>0x66A5 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 1829 skipping to change at line 1901
<section anchor="tracktranslatecodec-element"><name>TrackTranslateCodec Element< /name> <section anchor="tracktranslatecodec-element"><name>TrackTranslateCodec Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x66BF / uinteger</dd> <dd>0x66BF / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate\TrackTranslateCodec</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate\TrackTranslateCodec</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>This <tt>TrackTranslate</tt> applies to this chapter codec of the given chap <dd>Applies to the chapter codec of the given chapter edition(s); see <xref targ
ter edition(s); see <xref target="chapprocesscodecid-element"></xref>.</dd> et="chapprocesscodecid-element"></xref>.</dd>
<dt>defined values:</dt>
<dd>See <xref target="TrackTranslateCodecValues"/>.</dd>
</dl> </dl>
<t>defined values:</t>
<table anchor="TrackTranslateCodecValues"><name>TrackTranslateCodec values</name <table anchor="TrackTranslateCodecValues"><name>TrackTranslateCodec Values</name
> >
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 1854 skipping to change at line 1928
<td align="left">Matroska Script</td> <td align="left">Matroska Script</td>
<td align="left">Chapter commands using the Matroska Script codec.</td> <td align="left">Chapter commands using the Matroska Script codec.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">DVD-menu</td> <td align="left">DVD-menu</td>
<td align="left">Chapter commands using the DVD-like codec.</td> <td align="left">Chapter commands using the DVD-like codec.</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="tracktranslateeditionuid-element"><name>TrackTranslateEditionUI D Element</name> <section anchor="tracktranslateeditionuid-element"><name>TrackTranslateEditionUI D Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x66FC / uinteger</dd> <dd>0x66FC / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate\TrackTranslateEditionUID</tt>< /dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate\TrackTranslateEditionUID</tt>< /dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify a chapter edition UID on which this <tt>TrackTranslate</tt> applies. </dd> <dd>Specifies a chapter edition UID to which this <tt>TrackTranslate</tt> applie s.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>When no <tt>TrackTranslateEditionUID</tt> is specified in the <tt>TrackTrans late</tt>, the <tt>TrackTranslate</tt> applies to all chapter editions found in the Segment using the given <tt>TrackTranslateCodec</tt>.</dd> <dd>When no <tt>TrackTranslateEditionUID</tt> is specified in the <tt>TrackTrans late</tt>, the <tt>TrackTranslate</tt> applies to all chapter editions found in the <tt>Segment</tt> using the given <tt>TrackTranslateCodec</tt>.</dd>
</dl> </dl>
</section> </section>
</section> </section>
<section anchor="video-element"><name>Video Element</name> <section anchor="video-element"><name>Video Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE0 / master</dd> <dd>0xE0 / master</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 1896 skipping to change at line 1971
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x9A / uinteger / 0</dd> <dd>0x9A / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\FlagInterlaced</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\FlagInterlaced</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify whether the video frames in this track are interlaced.</dd> <dd>Specifies whether the video frames in this track are interlaced.</dd>
<dt>defined values:</dt>
<dd>See <xref target="FlagInterlacedValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t>
<table anchor="FlagInterlacedValues"><name>FlagInterlaced values</name> <table anchor="FlagInterlacedValues"><name>FlagInterlaced Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">undetermined</td> <td align="left">undetermined</td>
<td align="left">Unknown status.This value <bcp14>SHOULD</bcp14> be avoided.</td > <td align="left">Unknown status. This value <bcp14>SHOULD</bcp14> be avoided.</t d>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">interlaced</td> <td align="left">interlaced</td>
<td align="left">Interlaced frames.</td> <td align="left">Interlaced frames.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">progressive</td> <td align="left">progressive</td>
<td align="left">No interlacing.</td> <td align="left">No interlacing.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="fieldorder-element"><name>FieldOrder Element</name> <section anchor="fieldorder-element"><name>FieldOrder Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x9D / uinteger / 2</dd> <dd>0x9D / uinteger / 2</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\FieldOrder</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\FieldOrder</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify the field ordering of video frames in this track.</dd> <dd>Specifies the field ordering of video frames in this track.</dd>
<dt>defined values:</dt>
<dd>See <xref target="FieldOrderValues"/>.</dd>
<dt>usage notes:</dt>
<dd>If <tt>FlagInterlaced</tt> is not set to 1, this Element <bcp14>MUST</bcp14>
be ignored.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t>
<table anchor="FieldOrderValues"><name>FieldOrder values</name> <table anchor="FieldOrderValues"><name>FieldOrder Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">progressive</td> <td align="left">progressive</td>
<td align="left">Interlaced frames.This value <bcp14>SHOULD</bcp14> be avoided, setting FlagInterlaced to 2 is sufficient.</td> <td align="left">Interlaced frames. This value <bcp14>SHOULD</bcp14> be avoided; setting <tt>FlagInterlaced</tt> to 2 is sufficient.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">tff</td> <td align="left">tff</td>
<td align="left">Top field displayed first. Top field stored first.</td> <td align="left">Top field displayed first. Top field stored first.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">undetermined</td> <td align="left">undetermined</td>
<td align="left">Unknown field order.This value <bcp14>SHOULD</bcp14> be avoided .</td> <td align="left">Unknown field order. This value <bcp14>SHOULD</bcp14> be avoide d.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>6</tt></td> <td align="left"><tt>6</tt></td>
<td align="left">bff</td> <td align="left">bff</td>
<td align="left">Bottom field displayed first. Bottom field stored first.</td> <td align="left">Bottom field displayed first. Bottom field stored first.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>9</tt></td> <td align="left"><tt>9</tt></td>
<td align="left">bff(swapped)</td> <td align="left">tff (interleaved)</td>
<!-- [cellar] the labels for values 9 and 14 have been edited to match their des
cription
The description had been edited but not the labels. It has been fix in our repos
itory
in https://github.com/ietf-wg-cellar/matroska-specification/pull/819
-->
<td align="left">Top field displayed first. Fields are interleaved in storage wi th the top line of the top field stored first.</td> <td align="left">Top field displayed first. Fields are interleaved in storage wi th the top line of the top field stored first.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>14</tt></td> <td align="left"><tt>14</tt></td>
<td align="left">tff(swapped)</td> <td align="left">bff (interleaved)</td>
<td align="left">Bottom field displayed first. Fields are interleaved in storage with the top line of the top field stored first.</td> <td align="left">Bottom field displayed first. Fields are interleaved in storage with the top line of the top field stored first.</td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
<dl spacing="compact">
<dt>usage notes:</dt>
<dd>If FlagInterlaced is not set to 1, this Element <bcp14>MUST</bcp14> be ignor
ed.</dd>
</dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="stereomode-element"><name>StereoMode Element</name> <section anchor="stereomode-element"><name>StereoMode Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x53B8 / uinteger / 0</dd> <dd>0x53B8 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\StereoMode</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\StereoMode</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Stereo-3D video mode. There are some more details in <xref target="multi-pla <dd>Stereo-3D video mode. See <xref target="multi-planar-and-3d-videos"></xref>
nar-and-3d-videos"></xref>.</dd> for more details.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="StereoModeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t>
<table anchor="StereoModeValues"><name>StereoMode values</name> <table anchor="StereoModeValues"><name>StereoMode Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2098 skipping to change at line 2189
<tr> <tr>
<td align="left"><tt>13</tt></td> <td align="left"><tt>13</tt></td>
<td align="left">both eyes laced in one Block (left eye is first)</td> <td align="left">both eyes laced in one Block (left eye is first)</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>14</tt></td> <td align="left"><tt>14</tt></td>
<td align="left">both eyes laced in one Block (right eye is first)</td> <td align="left">both eyes laced in one Block (right eye is first)</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="alphamode-element"><name>AlphaMode Element</name> <section anchor="alphamode-element"><name>AlphaMode Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x53C0 / uinteger / 0</dd> <dd>0x53C0 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\AlphaMode</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\AlphaMode</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Indicate whether the BlockAdditional Element with BlockAddID of &quot;1&quot <dd>Indicates whether the <tt>BlockAdditional</tt> Element with <tt>BlockAddID</
; contains Alpha data, as defined by to the Codec Mapping for the <tt>CodecID</t tt> of "1"
t>. contains Alpha data as defined by the Codec Mapping for the <tt>CodecID</tt>.
Undefined values <bcp14>SHOULD NOT</bcp14> be used as the behavior of known impl Undefined values (i.e., values other than 0 or 1) <bcp14>SHOULD NOT</bcp14> be u
ementations is different (considered either as 0 or 1).</dd> sed, as the
behavior of known implementations is different.</dd>
<dt>defined values:</dt>
<dd>See <xref target="AlphaModeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="AlphaModeValues"><name>AlphaMode Values</name>
<table anchor="AlphaModeValues"><name>AlphaMode values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">none</td> <td align="left">none</td>
<td align="left">The BlockAdditional Element with BlockAddID of &quot;1&quot; do es not exist or <bcp14>SHOULD NOT</bcp14> be considered as containing such data. </td> <td align="left">The BlockAdditional Element with BlockAddID of "1" does not exi st or <bcp14>SHOULD NOT</bcp14> be considered as containing such data.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">present</td> <td align="left">present</td>
<td align="left">The BlockAdditional Element with BlockAddID of &quot;1&quot; co ntains alpha channel data.</td> <td align="left">The BlockAdditional Element with BlockAddID of "1" contains alp ha channel data.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="oldstereomode-element"><name>OldStereoMode Element</name> <section anchor="oldstereomode-element"><name>OldStereoMode Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x53B9 / uinteger</dd> <dd>0x53B9 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\OldStereoMode</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\OldStereoMode</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>maxver:</dt> <dt>maxver:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Bogus StereoMode value used in old versions of libmatroska.</dd>
<dd>Bogus <tt>StereoMode</tt> value used in old versions of <xref target="libmat
roska"></xref>.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="OldStereoModeValues"/>.</dd>
<dt>usage notes:</dt>
<dd>This Element <bcp14>MUST NOT</bcp14> be used. It was an incorrect value used
in libmatroska up to 0.9.0.</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="OldStereoModeValues"><name>OldStereoMode Values</name>
<table anchor="OldStereoModeValues"><name>OldStereoMode values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2187 skipping to change at line 2287
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">left eye</td> <td align="left">left eye</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">both eyes</td> <td align="left">both eyes</td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
<dl spacing="compact">
<dt>usage notes:</dt>
<dd>This Element <bcp14>MUST NOT</bcp14> be used. It was an incorrect value used
in libmatroska up to 0.9.0.</dd>
</dl>
</section> </section>
<section anchor="pixelwidth-element"><name>PixelWidth Element</name> <section anchor="pixelwidth-element"><name>PixelWidth Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xB0 / uinteger</dd> <dd>0xB0 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelWidth</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelWidth</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Width of the encoded video frames in pixels.</dd> <dd>Width of the encoded video frames in pixels.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="pixelheight-element"><name>PixelHeight Element</name> <section anchor="pixelheight-element"><name>PixelHeight Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xBA / uinteger</dd> <dd>0xBA / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelHeight</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelHeight</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Height of the encoded video frames in pixels.</dd> <dd>Height of the encoded video frames in pixels.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="pixelcropbottom-element"><name>PixelCropBottom Element</name> <section anchor="pixelcropbottom-element"><name>PixelCropBottom Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x54AA / uinteger / 0</dd> <dd>0x54AA / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropBottom</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropBottom</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The number of video pixels to remove at the bottom of the image.</dd> <dd>The number of video pixels to remove at the bottom of the image.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="pixelcroptop-element"><name>PixelCropTop Element</name> <section anchor="pixelcroptop-element"><name>PixelCropTop Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x54BB / uinteger / 0</dd> <dd>0x54BB / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropTop</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropTop</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The number of video pixels to remove at the top of the image.</dd> <dd>The number of video pixels to remove at the top of the image.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="pixelcropleft-element"><name>PixelCropLeft Element</name> <section anchor="pixelcropleft-element"><name>PixelCropLeft Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x54CC / uinteger / 0</dd> <dd>0x54CC / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropLeft</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropLeft</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The number of video pixels to remove on the left of the image.</dd> <dd>The number of video pixels to remove on the left of the image.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="pixelcropright-element"><name>PixelCropRight Element</name> <section anchor="pixelcropright-element"><name>PixelCropRight Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x54DD / uinteger / 0</dd> <dd>0x54DD / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropRight</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropRight</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The number of video pixels to remove on the right of the image.</dd> <dd>The number of video pixels to remove on the right of the image.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="displaywidth-element"><name>DisplayWidth Element</name> <section anchor="displaywidth-element"><name>DisplayWidth Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x54B0 / uinteger</dd> <dd>0x54B0 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayWidth</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayWidth</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Width of the video frames to display. Applies to the video frame after cropp ing (PixelCrop* Elements).</dd> <dd>Width of the video frames to display. Applies to the video frame after cropp ing (PixelCrop* Elements).</dd>
<dt>notes:</dt>
<dd>See <xref target="DisplayWidthNotes"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>notes:</t>
<table anchor="DisplayWidthNotes"><name>DisplayWidth implementation notes</name> <table anchor="DisplayWidthNotes"><name>DisplayWidth Implementation Notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">default</td> <td align="left">default</td>
<td align="left">If the DisplayUnit of the same TrackEntry is 0, then the defaul t value for DisplayWidth is equal toPixelWidth - PixelCropLeft - PixelCropRight, else there is no default value.</td> <td align="left">If the DisplayUnit of the same TrackEntry is 0, then the defaul t value for DisplayWidth is equal to PixelWidth - PixelCropLeft - PixelCropRight ; else, there is no default value.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="displayheight-element"><name>DisplayHeight Element</name> <section anchor="displayheight-element"><name>DisplayHeight Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x54BA / uinteger</dd> <dd>0x54BA / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayHeight</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayHeight</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Height of the video frames to display. Applies to the video frame after crop ping (PixelCrop* Elements).</dd> <dd>Height of the video frames to display. Applies to the video frame after crop ping (PixelCrop* Elements).</dd>
<dt>notes:</dt>
<dd>See <xref target="DisplayHeightNotes"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>notes:</t> <table anchor="DisplayHeightNotes"><name>DisplayHeight Implementation Notes</nam
<table anchor="DisplayHeightNotes"><name>DisplayHeight implementation notes</nam e>
e>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">default</td> <td align="left">default</td>
<td align="left">If the DisplayUnit of the same TrackEntry is 0, then the defaul t value for DisplayHeight is equal toPixelHeight - PixelCropTop - PixelCropBotto m, else there is no default value.</td> <td align="left">If the DisplayUnit of the same TrackEntry is 0, then the defaul t value for DisplayHeight is equal to PixelHeight - PixelCropTop - PixelCropBott om; else, there is no default value.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="displayunit-element"><name>DisplayUnit Element</name> <section anchor="displayunit-element"><name>DisplayUnit Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x54B2 / uinteger / 0</dd> <dd>0x54B2 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayUnit</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayUnit</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>How DisplayWidth &amp; DisplayHeight are interpreted.</dd> <dd>How <tt>DisplayWidth</tt> and <tt>DisplayHeight</tt> are interpreted.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="DisplayUnitValues"/>.</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="DisplayUnitValues"><name>DisplayUnit Values</name>
<table anchor="DisplayUnitValues"><name>DisplayUnit values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2398 skipping to change at line 2502
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">display aspect ratio</td> <td align="left">display aspect ratio</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>4</tt></td> <td align="left"><tt>4</tt></td>
<td align="left">unknown</td> <td align="left">unknown</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="uncompressedfourcc-element"><name>UncompressedFourCC Element</n ame> <section anchor="uncompressedfourcc-element"><name>UncompressedFourCC Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x2EB524 / binary</dd> <dd>0x2EB524 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>4</dd> <dd>4</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\UncompressedFourCC</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\UncompressedFourCC</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>see implementation notes / 1</dd> <dd>See <xref target="UncompressedFourCCNotes"/> / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify the uncompressed pixel format used for the Track's data as a FourCC. <dd>Specifies the uncompressed pixel format used for the <tt>Track</tt>'s data a
This value is similar in scope to the biCompression value of AVI's <tt>BITMAPINF s a FourCC.
O</tt> <xref target="AVIFormat"></xref>. There is no definitive list of FourCC v This value is similar in scope to the biCompression value of AVI's <tt>BITMAPINF
alues, nor an official registry. Some common values for YUV pixel formats can be O</tt> <xref target="AVIFormat"></xref>. There is neither a definitive list of F
found at <xref target="MSYUV8"></xref>, <xref target="MSYUV16"></xref> and <xre ourCC values nor an official registry. Some common values for YUV pixel formats
f target="FourCC-YUV"></xref>. Some common values for uncompressed RGB pixel for can be found at <xref target="MSYUV8"></xref>, <xref target="MSYUV16"></xref>, a
mats can be found at <xref target="MSRGB"></xref> and <xref target="FourCC-RGB"> nd <xref target="FourCC-YUV"></xref>. Some common values for uncompressed RGB pi
</xref>.</dd> xel formats can be found at <xref target="MSRGB"></xref> and <xref target="FourC
C-RGB"></xref>.</dd>
<dt>notes:</dt>
<dd>See <xref target="UncompressedFourCCNotes"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>notes:</t> <table anchor="UncompressedFourCCNotes"><name>UncompressedFourCC Implementation
<table anchor="UncompressedFourCCNotes"><name>UncompressedFourCC implementation Notes</name>
notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">minOccurs</td> <td align="left">minOccurs</td>
<td align="left">UncompressedFourCC <bcp14>MUST</bcp14> be set (minOccurs=1) in TrackEntry, when the CodecID Element of the TrackEntry is set to &quot;V_UNCOMPR ESSED&quot;.</td> <td align="left">UncompressedFourCC <bcp14>MUST</bcp14> be set (minOccurs=1) in TrackEntry when the <tt>CodecID</tt> Element of the TrackEntry is set to "V_UNCO MPRESSED".</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="colour-element"><name>Colour Element</name> <section anchor="colour-element"><name>Colour Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55B0 / master</dd> <dd>0x55B0 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings describing the colour format.</dd> <dd>Settings describing the color format.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="matrixcoefficients-element"><name>MatrixCoefficients Element</n ame> <section anchor="matrixcoefficients-element"><name>MatrixCoefficients Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55B1 / uinteger / 2</dd> <dd>0x55B1 / uinteger / 2</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MatrixCoefficients</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MatrixCoefficients</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Matrix Coefficients of the video used to derive luma and chroma values f rom red, green, and blue color primaries. <dd>The Matrix Coefficients of the video used to derive luma and chroma values f rom red, green, and blue color primaries.
For clarity, the value and meanings for MatrixCoefficients are adopted from Tabl For clarity, the value and meanings for <tt>MatrixCoefficients</tt> are adopted
e 4 of <xref target="ITU-H.273"></xref>.</dd> from Table 4 of <xref target="ITU-H.273"></xref>.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="MatrixCoefficientsValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="MatrixCoefficientsValues"><name>MatrixCoefficients Values</name>
<table anchor="MatrixCoefficientsValues"><name>MatrixCoefficients values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2550 skipping to change at line 2662
<tr> <tr>
<td align="left"><tt>13</tt></td> <td align="left"><tt>13</tt></td>
<td align="left">Chroma-derived Constant Luminance</td> <td align="left">Chroma-derived Constant Luminance</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>14</tt></td> <td align="left"><tt>14</tt></td>
<td align="left">ITU-R BT.2100-0</td> <td align="left">ITU-R BT.2100-0</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="bitsperchannel-element"><name>BitsPerChannel Element</name> <section anchor="bitsperchannel-element"><name>BitsPerChannel Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55B2 / uinteger / 0</dd> <dd>0x55B2 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\BitsPerChannel</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\BitsPerChannel</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Number of decoded bits per channel. A value of 0 indicates that the BitsPerC <dd>Number of decoded bits per channel. A value of 0 indicates that the <tt>Bits
hannel is unspecified.</dd> PerChannel</tt> is unspecified.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="chromasubsamplinghorz-element"><name>ChromaSubsamplingHorz Elem ent</name> <section anchor="chromasubsamplinghorz-element"><name>ChromaSubsamplingHorz Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55B3 / uinteger</dd> <dd>0x55B3 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSubsamplingHorz</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSubsamplingHorz</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The amount of pixels to remove in the Cr and Cb channels for every pixel not <dd>The number of pixels to remove in the Cr and Cb channels for every pixel not
removed horizontally. removed horizontally. Example: For video with 4:2:0 chroma subsampling, the <tt
Example: For video with 4:2:0 chroma subsampling, the ChromaSubsamplingHorz <bcp >ChromaSubsamplingHorz</tt>
14>SHOULD</bcp14> be set to 1.</dd> <bcp14>SHOULD</bcp14> be set to 1.
</dl> </dd>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t> <dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</section> </dl></section>
<section anchor="chromasubsamplingvert-element"><name>ChromaSubsamplingVert Elem ent</name> <section anchor="chromasubsamplingvert-element"><name>ChromaSubsamplingVert Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55B4 / uinteger</dd> <dd>0x55B4 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSubsamplingVert</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSubsamplingVert</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The amount of pixels to remove in the Cr and Cb channels for every pixel not <dd>The number of pixels to remove in the Cr and Cb channels for every pixel not
removed vertically. removed vertically. Example: For video with 4:2:0 chroma subsampling, the <tt>C
Example: For video with 4:2:0 chroma subsampling, the ChromaSubsamplingVert <bcp hromaSubsamplingVert</tt>
14>SHOULD</bcp14> be set to 1.</dd> <bcp14>SHOULD</bcp14> be set to 1.
</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="cbsubsamplinghorz-element"><name>CbSubsamplingHorz Element</nam e> <section anchor="cbsubsamplinghorz-element"><name>CbSubsamplingHorz Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55B5 / uinteger</dd> <dd>0x55B5 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\CbSubsamplingHorz</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\CbSubsamplingHorz</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The amount of pixels to remove in the Cb channel for every pixel not removed <dd>The number of pixels to remove in the Cb channel for every pixel not removed
horizontally. horizontally.
This is additive with ChromaSubsamplingHorz. Example: For video with 4:2:1 chrom This is additive with <tt>ChromaSubsamplingHorz</tt>.
a subsampling, Example: For video with 4:2:1 chroma
the ChromaSubsamplingHorz <bcp14>SHOULD</bcp14> be set to 1 and CbSubsamplingHor subsampling, the <tt>ChromaSubsamplingHorz</tt> <bcp14>SHOULD</bcp14> be set to
z <bcp14>SHOULD</bcp14> be set to 1.</dd> 1, and <tt>CbSubsamplingHorz</tt> <bcp14>SHOULD</bcp14> be set to 1.
</dl> </dd>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t> <dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</section> </dl></section>
<section anchor="cbsubsamplingvert-element"><name>CbSubsamplingVert Element</nam e> <section anchor="cbsubsamplingvert-element"><name>CbSubsamplingVert Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55B6 / uinteger</dd> <dd>0x55B6 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\CbSubsamplingVert</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\CbSubsamplingVert</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The amount of pixels to remove in the Cb channel for every pixel not removed <dd>The number of pixels to remove in the Cb channel for every pixel not removed
vertically. vertically.
This is additive with ChromaSubsamplingVert.</dd> This is additive with <tt>ChromaSubsamplingVert</tt>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="chromasitinghorz-element"><name>ChromaSitingHorz Element</name> <section anchor="chromasitinghorz-element"><name>ChromaSitingHorz Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55B7 / uinteger / 0</dd> <dd>0x55B7 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSitingHorz</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSitingHorz</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>How chroma is subsampled horizontally.</dd> <dd>How chroma is subsampled horizontally.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="ChromaSitingHorzValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="ChromaSitingHorzValues"><name>ChromaSitingHorz Values</name>
<table anchor="ChromaSitingHorzValues"><name>ChromaSitingHorz values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2682 skipping to change at line 2799
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">left collocated</td> <td align="left">left collocated</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">half</td> <td align="left">half</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="chromasitingvert-element"><name>ChromaSitingVert Element</name> <section anchor="chromasitingvert-element"><name>ChromaSitingVert Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55B8 / uinteger / 0</dd> <dd>0x55B8 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSitingVert</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSitingVert</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>How chroma is subsampled vertically.</dd> <dd>How chroma is subsampled vertically.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="ChromaSitingVertValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="ChromaSitingVertValues"><name>ChromaSitingVert Values</name>
<table anchor="ChromaSitingVertValues"><name>ChromaSitingVert values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2724 skipping to change at line 2844
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">top collocated</td> <td align="left">top collocated</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">half</td> <td align="left">half</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="range-element"><name>Range Element</name> <section anchor="range-element"><name>Range Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55B9 / uinteger / 0</dd> <dd>0x55B9 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\Range</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\Range</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Clipping of the color ranges.</dd> <dd>Clipping of the color ranges.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="RangeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t>
<table anchor="RangeValues"><name>Range values</name> <table anchor="RangeValues"><name>Range Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2771 skipping to change at line 2895
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">full range (no clipping)</td> <td align="left">full range (no clipping)</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">defined by MatrixCoefficients / TransferCharacteristics</td> <td align="left">defined by MatrixCoefficients / TransferCharacteristics</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="transfercharacteristics-element"><name>TransferCharacteristics Element</name> <section anchor="transfercharacteristics-element"><name>TransferCharacteristics Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55BA / uinteger / 2</dd> <dd>0x55BA / uinteger / 2</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\TransferCharacteristics</tt></dd > <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\TransferCharacteristics</tt></dd >
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The transfer characteristics of the video. For clarity, <dd>The transfer characteristics of the video. For clarity,
the value and meanings for TransferCharacteristics are adopted from Table 3 of < the value and meanings for <tt>TransferCharacteristics</tt> are adopted from Tab
xref target="ITU-H.273"></xref>.</dd> le 3 of <xref target="ITU-H.273"></xref>.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="TransferCharacteristicsValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="TransferCharacteristicsValues"><name>TransferCharacteristics Valu
<table anchor="TransferCharacteristicsValues"><name>TransferCharacteristics valu es</name>
es</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2894 skipping to change at line 3021
<tr> <tr>
<td align="left"><tt>17</tt></td> <td align="left"><tt>17</tt></td>
<td align="left">SMPTE ST 428-1</td> <td align="left">SMPTE ST 428-1</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>18</tt></td> <td align="left"><tt>18</tt></td>
<td align="left">ARIB STD-B67 (HLG)</td> <td align="left">ARIB STD-B67 (HLG)</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="primaries-element"><name>Primaries Element</name> <section anchor="primaries-element"><name>Primaries Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55BB / uinteger / 2</dd> <dd>0x55BB / uinteger / 2</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\Primaries</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\Primaries</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The colour primaries of the video. For clarity, <dd>The color primaries of the video. For clarity,
the value and meanings for Primaries are adopted from Table 2 of <xref target="I the value and meanings for <tt>Primaries</tt> are adopted from Table 2 of <xref
TU-H.273"></xref>.</dd> target="ITU-H.273"></xref>.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="PrimariesValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t>
<table anchor="PrimariesValues"><name>Primaries values</name> <table anchor="PrimariesValues"><name>Primaries Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2992 skipping to change at line 3123
<tr> <tr>
<td align="left"><tt>12</tt></td> <td align="left"><tt>12</tt></td>
<td align="left">SMPTE EG 432-2</td> <td align="left">SMPTE EG 432-2</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>22</tt></td> <td align="left"><tt>22</tt></td>
<td align="left">EBU Tech. 3213-E - JEDEC P22 phosphors</td> <td align="left">EBU Tech. 3213-E - JEDEC P22 phosphors</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="maxcll-element"><name>MaxCLL Element</name> <section anchor="maxcll-element"><name>MaxCLL Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55BC / uinteger</dd> <dd>0x55BC / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MaxCLL</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MaxCLL</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Maximum brightness of a single pixel (Maximum Content Light Level) <dd>Maximum brightness of a single pixel (Maximum Content Light Level)
in candelas per square meter (cd/m<sup>2</sup>).</dd> in candelas per square meter (cd/m<sup>2</sup>).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="maxfall-element"><name>MaxFALL Element</name> <section anchor="maxfall-element"><name>MaxFALL Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55BD / uinteger</dd> <dd>0x55BD / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MaxFALL</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MaxFALL</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Maximum brightness of a single full frame (Maximum Frame-Average Light Level ) <dd>Maximum brightness of a single full frame (Maximum Frame-Average Light Level )
in candelas per square meter (cd/m<sup>2</sup>).</dd> in candelas per square meter (cd/m<sup>2</sup>).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="masteringmetadata-element"><name>MasteringMetadata Element</nam e> <section anchor="masteringmetadata-element"><name>MasteringMetadata Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D0 / master</dd> <dd>0x55D0 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>SMPTE 2086 mastering data.</dd> <dd>SMPTE 2086 mastering data.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primaryrchromaticityx-element"><name>PrimaryRChromaticityX Elem ent</name> <section anchor="primaryrchromaticityx-element"><name>PrimaryRChromaticityX Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D1 / float</dd> <dd>0x55D1 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryRChroma ticityX</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryRChroma ticityX</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Red X chromaticity coordinate, as defined by <xref target="CIE-1931"></xref> .</dd> <dd>Red X chromaticity coordinate, as defined by <xref target="CIE-1931"></xref> .</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primaryrchromaticityy-element"><name>PrimaryRChromaticityY Elem ent</name> <section anchor="primaryrchromaticityy-element"><name>PrimaryRChromaticityY Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D2 / float</dd> <dd>0x55D2 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryRChroma ticityY</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryRChroma ticityY</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Red Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xref> .</dd> <dd>Red Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xref> .</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primarygchromaticityx-element"><name>PrimaryGChromaticityX Elem ent</name> <section anchor="primarygchromaticityx-element"><name>PrimaryGChromaticityX Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D3 / float</dd> <dd>0x55D3 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryGChroma ticityX</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryGChroma ticityX</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Green X chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd> <dd>Green X chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primarygchromaticityy-element"><name>PrimaryGChromaticityY Elem ent</name> <section anchor="primarygchromaticityy-element"><name>PrimaryGChromaticityY Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D4 / float</dd> <dd>0x55D4 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryGChroma ticityY</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryGChroma ticityY</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Green Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd> <dd>Green Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primarybchromaticityx-element"><name>PrimaryBChromaticityX Elem ent</name> <section anchor="primarybchromaticityx-element"><name>PrimaryBChromaticityX Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D5 / float</dd> <dd>0x55D5 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryBChroma ticityX</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryBChroma ticityX</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Blue X chromaticity coordinate, as defined by <xref target="CIE-1931"></xref >.</dd> <dd>Blue X chromaticity coordinate, as defined by <xref target="CIE-1931"></xref >.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primarybchromaticityy-element"><name>PrimaryBChromaticityY Elem ent</name> <section anchor="primarybchromaticityy-element"><name>PrimaryBChromaticityY Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D6 / float</dd> <dd>0x55D6 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryBChroma ticityY</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryBChroma ticityY</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Blue Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xref >.</dd> <dd>Blue Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xref >.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="whitepointchromaticityx-element"><name>WhitePointChromaticityX Element</name> <section anchor="whitepointchromaticityx-element"><name>WhitePointChromaticityX Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D7 / float</dd> <dd>0x55D7 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\WhitePointChro maticityX</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\WhitePointChro maticityX</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>White X chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd> <dd>White X chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="whitepointchromaticityy-element"><name>WhitePointChromaticityY Element</name> <section anchor="whitepointchromaticityy-element"><name>WhitePointChromaticityY Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D8 / float</dd> <dd>0x55D8 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\WhitePointChro maticityY</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\WhitePointChro maticityY</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>White Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd> <dd>White Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="luminancemax-element"><name>LuminanceMax Element</name> <section anchor="luminancemax-element"><name>LuminanceMax Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D9 / float</dd> <dd>0x55D9 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;= 0x0p+0</dd> <dd>&gt;= 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\LuminanceMax</ tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\LuminanceMax</ tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Maximum luminance. Represented in candelas per square meter (cd/m<sup>2</sup >).</dd> <dd>Maximum luminance. Represented in candelas per square meter (cd/m<sup>2</sup >).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="luminancemin-element"><name>LuminanceMin Element</name> <section anchor="luminancemin-element"><name>LuminanceMin Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55DA / float</dd> <dd>0x55DA / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;= 0x0p+0</dd> <dd>&gt;= 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\LuminanceMin</ tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\LuminanceMin</ tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Minimum luminance. Represented in candelas per square meter (cd/m<sup>2</sup >).</dd> <dd>Minimum luminance. Represented in candelas per square meter (cd/m<sup>2</sup >).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="projection-element"><name>Projection Element</name> <section anchor="projection-element"><name>Projection Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x7670 / master</dd> <dd>0x7670 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Projection</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Projection</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Describes the video projection details. Used to render spherical, VR videos <dd>Describes the video projection details. Used to render spherical or VR video
or flipping videos horizontally/vertically.</dd> s or to flip videos horizontally or vertically.</dd>
</dl> <dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t> </dl></section>
</section>
<section anchor="projectiontype-element"><name>ProjectionType Element</name> <section anchor="projectiontype-element"><name>ProjectionType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x7671 / uinteger / 0</dd> <dd>0x7671 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionType</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionType</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Describes the projection used for this video track.</dd> <dd>Describes the projection used for this video track.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="ProjectionTypeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="ProjectionTypeValues"><name>ProjectionType Values</name>
<table anchor="ProjectionTypeValues"><name>ProjectionType values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 3299 skipping to change at line 3432
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">cubemap</td> <td align="left">cubemap</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">mesh</td> <td align="left">mesh</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="projectionprivate-element"><name>ProjectionPrivate Element</nam e> <section anchor="projectionprivate-element"><name>ProjectionPrivate Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x7672 / binary</dd> <dd>0x7672 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPrivate</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPrivate</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Private data that only applies to a specific projection.</dd> <dd><t>Private data that only applies to a specific projection.</t>
</dl>
<ul spacing="compact"> <ul spacing="compact">
<li>If <tt>ProjectionType</tt> equals 0 (Rectangular), <li>If <tt>ProjectionType</tt> equals 0 (rectangular),
then this element <bcp14>MUST NOT</bcp14> be present.</li> then this element <bcp14>MUST NOT</bcp14> be present.</li>
<li>If <tt>ProjectionType</tt> equals 1 (Equirectangular), then this element <bc <li>If <tt>ProjectionType</tt> equals 1 (equirectangular), then this element <bc
p14>MUST</bcp14> be present and contain the same binary data that would be store p14>MUST</bcp14> be present and contain the same binary data that would be store
d inside d inside
an ISOBMFF Equirectangular Projection Box ('equi').</li> an ISOBMFF Equirectangular Projection Box ("equi").</li>
<li>If <tt>ProjectionType</tt> equals 2 (Cubemap), then this element <bcp14>MUST <li>If <tt>ProjectionType</tt> equals 2 (cubemap), then this element <bcp14>MUST
</bcp14> be present and contain the same binary data that would be stored </bcp14> be present and contain the same binary data that would be stored
inside an ISOBMFF Cubemap Projection Box ('cbmp').</li> inside an ISOBMFF Cubemap Projection Box ("cbmp").</li>
<li>If <tt>ProjectionType</tt> equals 3 (Mesh), then this element <bcp14>MUST</b <li>If <tt>ProjectionType</tt> equals 3 (mesh), then this element <bcp14>MUST</b
cp14> be present and contain the same binary data that would be stored inside cp14> be present and contain the same binary data that would be stored inside
an ISOBMFF Mesh Projection Box ('mshp').</li> an ISOBMFF Mesh Projection Box ("mshp").</li>
</ul> </ul>
</dd>
<dl spacing="compact">
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>ISOBMFF box size and fourcc fields are not included in the binary data, <dd>ISOBMFF box size and FourCC fields are not included in the binary data,
but the FullBox version and flag fields are. This is to avoid but the FullBox version and flag fields are. This is to avoid
redundant framing information while preserving versioning and semantics between the two container formats.</dd> redundant framing information while preserving versioning and semantics between the two container formats.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="projectionposeyaw-element"><name>ProjectionPoseYaw Element</nam e> <section anchor="projectionposeyaw-element"><name>ProjectionPoseYaw Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x7673 / float / 0x0p+0</dd> <dd>0x7673 / float / 0x0p+0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;= -0xB4p+0, &lt;= 0xB4p+0</dd> <dd>&gt;= -0xB4p+0, &lt;= 0xB4p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPoseYaw</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPoseYaw</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specifies a yaw rotation to the projection.</dd> <dd><t>Specifies a yaw rotation to the projection. Value represents a clockwise
</dl> rotation, in degrees, around the up vector. This rotation must be applied
<t>Value represents a clockwise rotation, in degrees, around the up vector. This
rotation must be applied
before any <tt>ProjectionPosePitch</tt> or <tt>ProjectionPoseRoll</tt> rotations . before any <tt>ProjectionPosePitch</tt> or <tt>ProjectionPoseRoll</tt> rotations .
The value of this element <bcp14>MUST</bcp14> be in the -180 to 180 degree range The value of this element <bcp14>MUST</bcp14> be in the -180 to 180 degree range
, both included.</t> , both inclusive.
<t>Setting <tt>ProjectionPoseYaw</tt> to 180 or -180 degrees, with the <tt>Proje Setting <tt>ProjectionPoseYaw</tt> to 180 or -180 degrees with <tt>ProjectionPos
ctionPoseRoll</tt> and <tt>ProjectionPosePitch</tt> set to 0 degrees flips the i eRoll</tt> and <tt>ProjectionPosePitch</tt> set to 0 degrees flips the image hor
mage horizontally.</t> izontally.</t></dd>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t> <dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl>
</section> </section>
<section anchor="projectionposepitch-element"><name>ProjectionPosePitch Element< /name> <section anchor="projectionposepitch-element"><name>ProjectionPosePitch Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x7674 / float / 0x0p+0</dd> <dd>0x7674 / float / 0x0p+0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;= -0x5Ap+0, &lt;= 0x5Ap+0</dd> <dd>&gt;= -0x5Ap+0, &lt;= 0x5Ap+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPosePitch</tt></dd > <dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPosePitch</tt></dd >
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specifies a pitch rotation to the projection.</dd> <dd><t>Specifies a pitch rotation to the projection. Value represents a counter-
</dl> clockwise rotation, in degrees, around the right vector. This rotation must be a
<t>Value represents a counter-clockwise rotation, in degrees, around the right v pplied
ector. This rotation must be applied
after the <tt>ProjectionPoseYaw</tt> rotation and before the <tt>ProjectionPoseR oll</tt> rotation. after the <tt>ProjectionPoseYaw</tt> rotation and before the <tt>ProjectionPoseR oll</tt> rotation.
The value of this element <bcp14>MUST</bcp14> be in the -90 to 90 degree range, The value of this element <bcp14>MUST</bcp14> be in the -90 to 90 degree range,
both included.</t> both inclusive.</t>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t> </dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl>
</section> </section>
<section anchor="projectionposeroll-element"><name>ProjectionPoseRoll Element</n ame> <section anchor="projectionposeroll-element"><name>ProjectionPoseRoll Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x7675 / float / 0x0p+0</dd> <dd>0x7675 / float / 0x0p+0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;= -0xB4p+0, &lt;= 0xB4p+0</dd> <dd>&gt;= -0xB4p+0, &lt;= 0xB4p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPoseRoll</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPoseRoll</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specifies a roll rotation to the projection.</dd> <dd><t>Specifies a roll rotation to the projection. Value represents a
counter-clockwise rotation, in degrees, around the forward vector. This
rotation must be applied after the <tt>ProjectionPoseYaw</tt> and
<tt>ProjectionPosePitch</tt> rotations. The value of this element
<bcp14>MUST</bcp14> be in the -180 to 180 degree range, both inclusive. Setting
<tt>ProjectionPoseRoll</tt> to 180 or -180 degrees and
<tt>ProjectionPoseYaw</tt> to 180 or -180 degrees with
<tt>ProjectionPosePitch</tt> set to 0 degrees flips the image vertically.</t>
<t>Setting <tt>ProjectionPoseRoll</tt> to 180 or -180 degrees with
<tt>ProjectionPoseYaw</tt> and <tt>ProjectionPosePitch</tt> set to 0 degrees
flips the image horizontally and vertically.</t></dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>Value represents a counter-clockwise rotation, in degrees, around the forward
vector. This rotation must be applied
after the <tt>ProjectionPoseYaw</tt> and <tt>ProjectionPosePitch</tt> rotations.
The value of this element <bcp14>MUST</bcp14> be in the -180 to 180 degree range
, both included.</t>
<t>Setting <tt>ProjectionPoseRoll</tt> to 180 or -180 degrees, the <tt>Projectio
nPoseYaw</tt> to 180 or -180 degrees with <tt>ProjectionPosePitch</tt> set to 0
degrees flips the image vertically.</t>
<t>Setting <tt>ProjectionPoseRoll</tt> to 180 or -180 degrees, with the <tt>Proj
ectionPoseYaw</tt> and <tt>ProjectionPosePitch</tt> set to 0 degrees flips the i
mage horizontally and vertically.</t>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
</section> </section>
<section anchor="audio-element"><name>Audio Element</name> <section anchor="audio-element"><name>Audio Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE1 / master</dd> <dd>0xE1 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio</tt></dd>
skipping to change at line 3433 skipping to change at line 3571
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0xB5 / float / 0x1.f4p+12</dd> <dd>0xB5 / float / 0x1.f4p+12</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt; 0x0p+0</dd> <dd>&gt; 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio\SamplingFrequency</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio\SamplingFrequency</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Sampling frequency in Hz.</dd> <dd>Sampling frequency in Hz.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="outputsamplingfrequency-element"><name>OutputSamplingFrequency Element</name> <section anchor="outputsamplingfrequency-element"><name>OutputSamplingFrequency Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x78B5 / float</dd> <dd>0x78B5 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt; 0x0p+0</dd> <dd>&gt; 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio\OutputSamplingFrequency</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio\OutputSamplingFrequency</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Real output sampling frequency in Hz (used for SBR techniques).</dd>
<dd>Real output sampling frequency in Hz that is used for Spectral Band Replicat
ion (SBR) techniques.</dd>
<dt>notes:</dt>
<dd>See <xref target="OutputSamplingFrequencyNotes"/>.</dd>
</dl> </dl>
<t>notes:</t> <table anchor="OutputSamplingFrequencyNotes"><name>OutputSamplingFrequency Imple
<table anchor="OutputSamplingFrequencyNotes"><name>OutputSamplingFrequency imple mentation Notes</name>
mentation notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">default</td> <td align="left">default</td>
<td align="left">The default value for OutputSamplingFrequency of the same Track Entry is equal to the SamplingFrequency.</td> <td align="left">The default value for <tt>OutputSamplingFrequency</tt> of the s ame <tt>TrackEntry</tt> is equal to the <tt>SamplingFrequency</tt>.</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="channels-element"><name>Channels Element</name> <section anchor="channels-element"><name>Channels Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x9F / uinteger / 1</dd> <dd>0x9F / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio\Channels</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio\Channels</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Numbers of channels in the track.</dd> <dd>Numbers of channels in the track.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="bitdepth-element"><name>BitDepth Element</name> <section anchor="bitdepth-element"><name>BitDepth Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6264 / uinteger</dd> <dd>0x6264 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio\BitDepth</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio\BitDepth</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Bits per sample, mostly used for PCM.</dd> <dd>Bits per sample, mostly used for PCM.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
</section> </section>
<section anchor="trackoperation-element"><name>TrackOperation Element</name> <section anchor="trackoperation-element"><name>TrackOperation Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE2 / master</dd> <dd>0xE2 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Operation that needs to be applied on tracks to create this virtual track. <dd>Operation that needs to be applied on tracks to create this virtual track. F
For more details look at <xref target="track-operation"></xref>.</dd> or more details, see <xref target="track-operation"></xref>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
<section anchor="trackcombineplanes-element"><name>TrackCombinePlanes Element</n ame> <section anchor="trackcombineplanes-element"><name>TrackCombinePlanes Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE3 / master</dd> <dd>0xE3 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains the list of all video plane tracks that need to be combined to crea <dd>Contains the list of all video plane tracks that need to be combined to crea
te this 3D track</dd> te this 3D track.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="trackplane-element"><name>TrackPlane Element</name> <section anchor="trackplane-element"><name>TrackPlane Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE4 / master</dd> <dd>0xE4 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane< /tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane< /tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains a video plane track that need to be combined to create this 3D trac <dd>Contains a video plane track that needs to be combined to create this 3D tra
k</dd> ck.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="trackplaneuid-element"><name>TrackPlaneUID Element</name> <section anchor="trackplaneuid-element"><name>TrackPlaneUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE5 / uinteger</dd> <dd>0xE5 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane\ TrackPlaneUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane\ TrackPlaneUID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The trackUID number of the track representing the plane.</dd> <dd>The <tt>TrackUID</tt> number of the track representing the plane.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="trackplanetype-element"><name>TrackPlaneType Element</name> <section anchor="trackplanetype-element"><name>TrackPlaneType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE6 / uinteger</dd> <dd>0xE6 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane\ TrackPlaneType</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane\ TrackPlaneType</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The kind of plane this track corresponds to.</dd> <dd>The kind of plane this track corresponds to.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="TrackPlaneTypeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="TrackPlaneTypeValues"><name>TrackPlaneType Values</name>
<table anchor="TrackPlaneTypeValues"><name>TrackPlaneType values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 3612 skipping to change at line 3755
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">right eye</td> <td align="left">right eye</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">background</td> <td align="left">background</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="trackjoinblocks-element"><name>TrackJoinBlocks Element</name> <section anchor="trackjoinblocks-element"><name>TrackJoinBlocks Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE9 / master</dd> <dd>0xE9 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackJoinBlocks</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackJoinBlocks</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains the list of all tracks whose Blocks need to be combined to create t <dd>Contains the list of all tracks whose Blocks need to be combined to create t
his virtual track</dd> his virtual track.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="trackjoinuid-element"><name>TrackJoinUID Element</name> <section anchor="trackjoinuid-element"><name>TrackJoinUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xED / uinteger</dd> <dd>0xED / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackJoinBlocks\TrackJoinUID</ tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackJoinBlocks\TrackJoinUID</ tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The trackUID number of a track whose blocks are used to create this virtual <dd>The TrackUID number of a track whose blocks are used to create this virtual
track.</dd> track.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
</section> </section>
<section anchor="contentencodings-element"><name>ContentEncodings Element</name> <section anchor="contentencodings-element"><name>ContentEncodings Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6D80 / master</dd> <dd>0x6D80 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings for several content encoding mechanisms like compression or encrypt ion.</dd> <dd>Settings for several content encoding mechanisms like compression or encrypt ion.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
<section anchor="contentencoding-element"><name>ContentEncoding Element</name> <section anchor="contentencoding-element"><name>ContentEncoding Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6240 / master</dd> <dd>0x6240 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings for one content encoding like compression or encryption.</dd> <dd>Settings for one content encoding like compression or encryption.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentencodingorder-element"><name>ContentEncodingOrder Elemen t</name> <section anchor="contentencodingorder-element"><name>ContentEncodingOrder Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x5031 / uinteger / 0</dd> <dd>0x5031 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingOrder</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingOrder</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Tell in which order to apply each <tt>ContentEncoding</tt> of the <tt>Conten
tEncodings</tt>. <dd>Defines the order to apply each <tt>ContentEncoding</tt> of the <tt>ContentE
ncodings</tt>.
The decoder/demuxer <bcp14>MUST</bcp14> start with the <tt>ContentEncoding</tt> with the highest <tt>ContentEncodingOrder</tt> and work its way down to the <tt> ContentEncoding</tt> with the lowest <tt>ContentEncodingOrder</tt>. The decoder/demuxer <bcp14>MUST</bcp14> start with the <tt>ContentEncoding</tt> with the highest <tt>ContentEncodingOrder</tt> and work its way down to the <tt> ContentEncoding</tt> with the lowest <tt>ContentEncodingOrder</tt>.
This value <bcp14>MUST</bcp14> be unique over for each <tt>ContentEncoding</tt> This value <bcp14>MUST</bcp14> be unique for each <tt>ContentEncoding</tt> found
found in the <tt>ContentEncodings</tt> of this <tt>TrackEntry</tt>.</dd> in the <tt>ContentEncodings</tt> of this <tt>TrackEntry</tt>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentencodingscope-element"><name>ContentEncodingScope Elemen t</name> <section anchor="contentencodingscope-element"><name>ContentEncodingScope Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x5032 / uinteger / 1</dd> <dd>0x5032 / uinteger / 1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingScope</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingScope</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A bit field that describes which Elements have been modified in this way. <dd>A bit field that describes which Elements have been modified in this way.
Values (big-endian) can be OR'ed.</dd> Values (big-endian) can be OR'ed.</dd>
<dt>defined values:</dt>
<dd>See <xref target="ContentEncodingScopeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="ContentEncodingScopeValues"><name>ContentEncodingScope Values</na
<table anchor="ContentEncodingScopeValues"><name>ContentEncodingScope values</na me>
me>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">Block</td> <td align="left">Block</td>
<td align="left">All frame contents, excluding lacing data.</td> <td align="left">All frame contents, excluding lacing data.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">Private</td> <td align="left">Private</td>
<td align="left">The track's <tt>CodecPrivate</tt> data.</td> <td align="left">The track's CodecPrivate data.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>4</tt></td> <td align="left"><tt>4</tt></td>
<td align="left">Next</td> <td align="left">Next</td>
<td align="left">The next ContentEncoding (next <tt>ContentEncodingOrder</tt>. E ither the data inside <tt>ContentCompression</tt> and/or <tt>ContentEncryption</ tt>).This value <bcp14>SHOULD NOT</bcp14> be used as it's not supported by playe rs.</td> <td align="left">The next ContentEncoding (next ContentEncodingOrder; the data i nside ContentCompression and/or ContentEncryption). This value <bcp14>SHOULD NOT </bcp14> be used, as it's not supported by players.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="contentencodingtype-element"><name>ContentEncodingType Element< /name> <section anchor="contentencodingtype-element"><name>ContentEncodingType Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x5033 / uinteger / 0</dd> <dd>0x5033 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingType</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingType</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A value describing what kind of transformation is applied.</dd> <dd>A value describing the kind of transformation that is applied.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="ContentEncodingTypeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t>
<table anchor="ContentEncodingTypeValues"><name>ContentEncodingType values</name <table anchor="ContentEncodingTypeValues"><name>ContentEncodingType Values</name
> >
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">Compression</td> <td align="left">Compression</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">Encryption</td> <td align="left">Encryption</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="contentcompression-element"><name>ContentCompression Element</n ame> <section anchor="contentcompression-element"><name>ContentCompression Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x5034 / master</dd> <dd>0x5034 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings describing the compression used. <dd>Settings describing the compression used.
This Element <bcp14>MUST</bcp14> be present if the value of ContentEncodingType This Element <bcp14>MUST</bcp14> be present if the value of <tt>ContentEncodingT
is 0 and absent otherwise. ype</tt> is 0 and absent otherwise.
Each block <bcp14>MUST</bcp14> be decompressable even if no previous block is av Each block <bcp14>MUST</bcp14> be decompressable, even if no previous block is a
ailable in order not to prevent seeking.</dd> vailable in order to not prevent seeking.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentcompalgo-element"><name>ContentCompAlgo Element</name> <section anchor="contentcompalgo-element"><name>ContentCompAlgo Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x4254 / uinteger / 0</dd> <dd>0x4254 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession\ContentCompAlgo</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession\ContentCompAlgo</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The compression algorithm used.</dd> <dd>The compression algorithm used.</dd>
<dt>defined values:</dt>
<dd>See <xref target="ContentCompAlgoValues"/>.</dd>
<dt>usage notes:</dt>
<dd>Compression method "1" (bzlib) and "2" (lzo1x) lack proper documentation on
the format, which limits implementation possibilities. Due to licensing conflict
s on commonly available libraries' compression methods, "2" (lzo1x) does not off
er widespread interoperability. A Matroska Writer <bcp14>SHOULD NOT</bcp14> use
these compression methods by default. A Matroska Reader <bcp14>MAY</bcp14> suppo
rt methods "1" and "2" and <bcp14>SHOULD</bcp14> support other methods.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t>
<table anchor="ContentCompAlgoValues"><name>ContentCompAlgo values</name> <table anchor="ContentCompAlgoValues"><name>ContentCompAlgo Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">zlib</td> <td align="left">zlib</td>
<td align="left">zlib compression <xref target="RFC1950"></xref>.</td> <td align="left">zlib compression <xref target="RFC1950"></xref>.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">bzlib</td> <td align="left">bzlib</td>
<td align="left">bzip2 compression <xref target="BZIP2"></xref>, <bcp14>SHOULD N OT</bcp14> be used; see usage notes.</td> <td align="left">bzip2 compression <xref target="BZIP2"></xref> <bcp14>SHOULD NO T</bcp14> be used; see usage notes.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">lzo1x</td> <td align="left">lzo1x</td>
<td align="left">Lempel-Ziv-Oberhumer compression <xref target="LZO"></xref>, <b cp14>SHOULD NOT</bcp14> be used; see usage notes.</td> <td align="left">Lempel-Ziv-Oberhumer compression <xref target="LZO"></xref> <bc p14>SHOULD NOT</bcp14> be used; see usage notes.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">Header Stripping</td> <td align="left">Header Stripping</td>
<td align="left">Octets in <tt>ContentCompSettings</tt> (<xref target="contentco mpsettings-element"></xref>) have been stripped from each frame.</td> <td align="left">Octets in ContentCompSettings (<xref target="contentcompsetting s-element"></xref>) have been stripped from each frame.</td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
<dl spacing="compact">
<dt>usage notes:</dt>
<dd>Compression method &quot;1&quot; (bzlib) and &quot;2&quot; (lzo1x) are lacki
ng proper documentation on the format which limits implementation possibilities.
Due to licensing conflicts on commonly available libraries compression methods &
quot;2&quot; (lzo1x) does not offer widespread interoperability.
A Matroska Writer <bcp14>SHOULD NOT</bcp14> use these compression methods by def
ault.
A Matroska Reader <bcp14>MAY</bcp14> support methods &quot;1&quot; and &quot;2&q
uot; as possible, and <bcp14>SHOULD</bcp14> support other methods.</dd>
</dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentcompsettings-element"><name>ContentCompSettings Element< /name> <section anchor="contentcompsettings-element"><name>ContentCompSettings Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4255 / binary</dd> <dd>0x4255 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession\ContentCompSettings</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession\ContentCompSettings</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings that might be needed by the decompressor. For Header Stripping (<tt >ContentCompAlgo</tt>=3), <dd>Settings that might be needed by the decompressor. For Header Stripping (<tt >ContentCompAlgo</tt>=3),
the bytes that were removed from the beginning of each frames of the track.</dd> the bytes that were removed from the beginning of each frame of the track.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentencryption-element"><name>ContentEncryption Element</nam e> <section anchor="contentencryption-element"><name>ContentEncryption Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x5035 / master</dd> <dd>0x5035 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings describing the encryption used. <dd>Settings describing the encryption used.
This Element <bcp14>MUST</bcp14> be present if the value of <tt>ContentEncodingT ype</tt> is 1 (encryption) and <bcp14>MUST</bcp14> be ignored otherwise. This Element <bcp14>MUST</bcp14> be present if the value of <tt>ContentEncodingT ype</tt> is 1 (encryption) and <bcp14>MUST</bcp14> be ignored otherwise.
A Matroska Player <bcp14>MAY</bcp14> support encryption.</dd> A Matroska Player <bcp14>MAY</bcp14> support encryption.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentencalgo-element"><name>ContentEncAlgo Element</name> <section anchor="contentencalgo-element"><name>ContentEncAlgo Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x47E1 / uinteger / 0</dd> <dd>0x47E1 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAlgo</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAlgo</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The encryption algorithm used.</dd> <dd>The encryption algorithm used.</dd>
<dt>defined values:</dt>
<dd>See <xref target="ContentEncAlgoValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="ContentEncAlgoValues"><name>ContentEncAlgo Values</name>
<table anchor="ContentEncAlgoValues"><name>ContentEncAlgo values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">Not encrypted</td> <td align="left">Not encrypted</td>
<td align="left">The data are not encrypted.</td> <td align="left">The data are not encrypted.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">DES</td> <td align="left">DES</td>
<td align="left">Data Encryption Standard (DES) <xref target="FIPS.46-3"></xref> .This value <bcp14>SHOULD</bcp14> be avoided.</td> <td align="left">Data Encryption Standard (DES) <xref target="FIPS46-3"></xref>. This value <bcp14>SHOULD</bcp14> be avoided.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">3DES</td> <td align="left">3DES</td>
<td align="left">Triple Data Encryption Algorithm <xref target="SP.800-67"></xre f>.This value <bcp14>SHOULD</bcp14> be avoided.</td> <td align="left">Triple Data Encryption Algorithm <xref target="SP800-67"></xref >. This value <bcp14>SHOULD</bcp14> be avoided.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">Twofish</td> <td align="left">Twofish</td>
<td align="left">Twofish Encryption Algorithm <xref target="Twofish"></xref>.</t d> <td align="left">Twofish Encryption Algorithm <xref target="Twofish"></xref>.</t d>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>4</tt></td> <td align="left"><tt>4</tt></td>
<td align="left">Blowfish</td> <td align="left">Blowfish</td>
<td align="left">Blowfish Encryption Algorithm <xref target="Blowfish"></xref>.T his value <bcp14>SHOULD</bcp14> be avoided.</td> <td align="left">Blowfish Encryption Algorithm <xref target="Blowfish"></xref>. This value <bcp14>SHOULD</bcp14> be avoided.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>5</tt></td> <td align="left"><tt>5</tt></td>
<td align="left">AES</td> <td align="left">AES</td>
<td align="left">Advanced Encryption Standard (AES) <xref target="FIPS.197"></xr ef>.</td> <td align="left">Advanced Encryption Standard (AES) <xref target="FIPS197"></xre f>.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="contentenckeyid-element"><name>ContentEncKeyID Element</name> <section anchor="contentenckeyid-element"><name>ContentEncKeyID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x47E2 / binary</dd> <dd>0x47E2 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncKeyID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncKeyID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>For public key algorithms this is the ID of the public key the data was encr <dd>For public key algorithms, the ID of the public key that the data was encryp
ypted with.</dd> ted with.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentencaessettings-element"><name>ContentEncAESSettings Elem ent</name> <section anchor="contentencaessettings-element"><name>ContentEncAESSettings Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x47E7 / master</dd> <dd>0x47E7 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAESSettings</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAESSettings</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings describing the encryption algorithm used.</dd> <dd>Settings describing the encryption algorithm used.</dd>
<dt>notes:</dt>
<dd>See <xref target="ContentEncAESSettingsNotes"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>notes:</t> <table anchor="ContentEncAESSettingsNotes"><name>ContentEncAESSettings Implement
<table anchor="ContentEncAESSettingsNotes"><name>ContentEncAESSettings implement ation Notes</name>
ation notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">maxOccurs</td> <td align="left">maxOccurs</td>
<td align="left">ContentEncAESSettings <bcp14>MUST NOT</bcp14> be set (maxOccurs =0) if ContentEncAlgo is not AES (5).</td> <td align="left">ContentEncAESSettings <bcp14>MUST NOT</bcp14> be set (maxOccurs =0) if ContentEncAlgo is not AES (5).</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="aessettingsciphermode-element"><name>AESSettingsCipherMode Elem ent</name> <section anchor="aessettingsciphermode-element"><name>AESSettingsCipherMode Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x47E8 / uinteger</dd> <dd>0x47E8 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAESSettings\AESSettingsCipherMode</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAESSettings\AESSettingsCipherMode</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The AES cipher mode used in the encryption.</dd> <dd>The AES cipher mode used in the encryption.</dd>
<dt>defined values:</dt>
<dd>See <xref target="AESSettingsCipherModeValues"/>.</dd>
<dt>notes:</dt>
<dd>See <xref target="AESSettingsCipherModeNotes"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="AESSettingsCipherModeValues"><name>AESSettingsCipherMode Values</
<table anchor="AESSettingsCipherModeValues"><name>AESSettingsCipherMode values</ name>
name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">AES-CTR</td> <td align="left">AES-CTR</td>
<td align="left">Counter <xref target="SP.800-38A"></xref>.</td> <td align="left">Counter <xref target="SP800-38A"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">AES-CBC</td> <td align="left">AES-CBC</td>
<td align="left">Cipher Block Chaining <xref target="SP.800-38A"></xref>.</td> <td align="left">Cipher Block Chaining <xref target="SP800-38A"></xref></td>
</tr> </tr>
</tbody> </tbody>
</table><t>notes:</t> </table>
<table anchor="AESSettingsCipherModeNotes"><name>AESSettingsCipherMode implement
ation notes</name> <table anchor="AESSettingsCipherModeNotes"><name>AESSettingsCipherMode Implement
ation Notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">maxOccurs</td> <td align="left">maxOccurs</td>
<td align="left">AESSettingsCipherMode <bcp14>MUST NOT</bcp14> be set (maxOccurs =0) if ContentEncAlgo is not AES (5).</td> <td align="left">AESSettingsCipherMode <bcp14>MUST NOT</bcp14> be set (maxOccurs =0) if ContentEncAlgo is not AES (5).</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
<section anchor="cues-element"><name>Cues Element</name> <section anchor="cues-element"><name>Cues Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1C53BB6B / master</dd> <dd>0x1C53BB6B / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues</tt></dd> <dd><tt>\Segment\Cues</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>see implementation notes / 1</dd> <dd>See <xref target="CuesNotes"/> / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A Top-Level Element to speed seeking access. <dd>A Top-Level Element to speed seeking access.
All entries are local to the Segment.</dd> All entries are local to the <tt>Segment</tt>.</dd>
<dt>notes:</dt>
<dd>See <xref target="CuesNotes"/>.</dd>
</dl> </dl>
<t>notes:</t> <table anchor="CuesNotes"><name>Cues Implementation Notes</name>
<table anchor="CuesNotes"><name>Cues implementation notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">minOccurs</td> <td align="left">minOccurs</td>
<td align="left">This Element <bcp14>SHOULD</bcp14> be set when the Segment is n ot transmitted as a live stream; see <xref target="livestreaming"></xref>.</td> <td align="left">This Element <bcp14>SHOULD</bcp14> be set when the <tt>Segment< /tt> is not transmitted as a live stream; see <xref target="livestreaming"></xre f>.</td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
<section anchor="cuepoint-element"><name>CuePoint Element</name> <section anchor="cuepoint-element"><name>CuePoint Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xBB / master</dd> <dd>0xBB / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint</tt></dd> <dd><tt>\Segment\Cues\CuePoint</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains all information relative to a seek point in the Segment.</dd> <dd>Contains all information relative to a seek point in the <tt>Segment</tt>.</ dd>
</dl> </dl>
<section anchor="cuetime-element"><name>CueTime Element</name> <section anchor="cuetime-element"><name>CueTime Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xB3 / uinteger</dd> <dd>0xB3 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTime</tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTime</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Absolute timestamp of the seek point, expressed in Matroska Ticks -- i.e., i <dd>Absolute timestamp of the seek point, expressed in Segment Ticks, which are
n nanoseconds; see <xref target="timestamp-ticks"></xref>.</dd> based on <tt>TimestampScale</tt>; see <xref target="timestamp-ticks"></xref>.</d
d>
<!-- [cellar] changed CueTime from Matroska Ticks to Segment Ticks
It was brought to our attention after our last submission that this was mistaken
for a Matroska Tick. We fix the issue in our repository in https://github.com/ie
tf-wg-cellar/matroska-specification/pull/814
-->
</dl> </dl>
</section> </section>
<section anchor="cuetrackpositions-element"><name>CueTrackPositions Element</nam e> <section anchor="cuetrackpositions-element"><name>CueTrackPositions Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xB7 / master</dd> <dd>0xB7 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions</tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contain positions for different tracks corresponding to the timestamp.</dd> <dd>Contains positions for different tracks corresponding to the timestamp.</dd>
</dl> </dl>
<section anchor="cuetrack-element"><name>CueTrack Element</name> <section anchor="cuetrack-element"><name>CueTrack Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xF7 / uinteger</dd> <dd>0xF7 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 4148 skipping to change at line 4316
<section anchor="cueclusterposition-element"><name>CueClusterPosition Element</n ame> <section anchor="cueclusterposition-element"><name>CueClusterPosition Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xF1 / uinteger</dd> <dd>0xF1 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueClusterPosition</tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueClusterPosition</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Segment Position (<xref target="segment-position"></xref>) of the Cluste r containing the associated Block.</dd> <dd>The <tt>Segment Position</tt> (<xref target="segment-position"></xref>) of t he <tt>Cluster</tt> containing the associated <tt>Block</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="cuerelativeposition-element"><name>CueRelativePosition Element< /name> <section anchor="cuerelativeposition-element"><name>CueRelativePosition Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xF0 / uinteger</dd> <dd>0xF0 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueRelativePosition</tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueRelativePosition</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The relative position inside the Cluster of the referenced SimpleBlock or Bl <dd>The relative position inside the <tt>Cluster</tt> of the referenced <tt>Simp
ockGroup leBlock</tt> or <tt>BlockGroup</tt>
with 0 being the first possible position for an Element inside that Cluster.</dd with 0 being the first possible position for an Element inside that <tt>Cluster<
> /tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="cueduration-element"><name>CueDuration Element</name> <section anchor="cueduration-element"><name>CueDuration Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xB2 / uinteger</dd> <dd>0xB2 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueDuration</tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueDuration</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The duration of the block, expressed in Segment Ticks which is based on Time <dd>The duration of the block, expressed in Segment Ticks, which are based on <t
stampScale; see <xref target="timestamp-ticks"></xref>. t>TimestampScale</tt>; see <xref target="timestamp-ticks"></xref>.
If missing, the track's DefaultDuration does not apply and no duration informati If missing, the track's <tt>DefaultDuration</tt> does not apply and no duration
on is available in terms of the cues.</dd> information is available in terms of the cues.</dd>
</dl> </dl>
</section> </section>
<section anchor="cueblocknumber-element"><name>CueBlockNumber Element</name> <section anchor="cueblocknumber-element"><name>CueBlockNumber Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x5378 / uinteger</dd> <dd>0x5378 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueBlockNumber</tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueBlockNumber</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Number of the Block in the specified Cluster.</dd> <dd>Number of the <tt>Block</tt> in the specified <tt>Cluster</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="cuecodecstate-element"><name>CueCodecState Element</name> <section anchor="cuecodecstate-element"><name>CueCodecState Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0xEA / uinteger / 0</dd> <dd>0xEA / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueCodecState</tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueCodecState</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Segment Position (<xref target="segment-position"></xref>) of the Codec <dd>The <tt>Segment Position</tt> (<xref target="segment-position"></xref>) of t
State corresponding to this Cue Element. he Codec State corresponding to this <tt>Cues</tt> Element.
0 means that the data is taken from the initial Track Entry.</dd> 0 means that the data is taken from the initial <tt>TrackEntry</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="cuereference-element"><name>CueReference Element</name> <section anchor="cuereference-element"><name>CueReference Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xDB / master</dd> <dd>0xDB / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference</tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference</tt></dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Clusters containing the referenced Blocks.</dd> <dd>The <tt>Clusters</tt> containing the referenced Blocks.</dd>
</dl> </dl>
</section> </section>
<section anchor="cuereftime-element"><name>CueRefTime Element</name> <section anchor="cuereftime-element"><name>CueRefTime Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x96 / uinteger</dd> <dd>0x96 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference\CueRefTime</tt></d d> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference\CueRefTime</tt></d d>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Timestamp of the referenced Block, expressed in Matroska Ticks -- i.e., in n <dd>Timestamp of the referenced Block, expressed in Segment Ticks which is based
anoseconds; see <xref target="timestamp-ticks"></xref>.</dd> on <tt>TimestampScale</tt>; see <xref target="timestamp-ticks"></xref>.</dd>
<!-- [cellar] changed CueRefTime from Matroska Ticks to Segment Ticks
It was brought to our attention after our last submission that this was mistaken
for a Matroska Tick. We fix the issue in our repository in https://github.com/ie
tf-wg-cellar/matroska-specification/pull/815
-->
</dl> </dl>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
<section anchor="attachments-element"><name>Attachments Element</name> <section anchor="attachments-element"><name>Attachments Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1941A469 / master</dd> <dd>0x1941A469 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments</tt></dd> <dd><tt>\Segment\Attachments</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contain attached files.</dd> <dd>Contains attached files.</dd>
</dl> </dl>
<section anchor="attachedfile-element"><name>AttachedFile Element</name> <section anchor="attachedfile-element"><name>AttachedFile Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x61A7 / master</dd> <dd>0x61A7 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
skipping to change at line 4316 skipping to change at line 4491
<section anchor="filemediatype-element"><name>FileMediaType Element</name> <section anchor="filemediatype-element"><name>FileMediaType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4660 / string</dd> <dd>0x4660 / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileMediaType</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileMediaType</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Media type of the file following the <xref target="RFC6838"></xref> format.< <dd>Media type of the file following the format described in <xref target="RFC68
/dd> 38"></xref>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="filedata-element"><name>FileData Element</name> <section anchor="filedata-element"><name>FileData Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x465C / binary</dd> <dd>0x465C / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileData</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileData</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The data of the file.</dd> <dd>The data of the file.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="fileuid-element"><name>FileUID Element</name> <section anchor="fileuid-element"><name>FileUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x46AE / uinteger</dd> <dd>0x46AE / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileUID</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileUID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Unique ID representing the file, as random as possible.</dd> <dd>UID representing the file, as random as possible.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
</section> </section>
</section> </section>
<section anchor="chapters-element"><name>Chapters Element</name> <section anchor="chapters-element"><name>Chapters Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1043A770 / master</dd> <dd>0x1043A770 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters</tt></dd> <dd><tt>\Segment\Chapters</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
</dl> <dt>recurring:</dt><dd>True</dd>
<t>recurring: True</t>
<dl spacing="compact">
<dt>definition:</dt> <dt>definition:</dt>
<dd>A system to define basic menus and partition data. <dd>A system to define basic menus and partition data.
For more detailed information, look at the Chapters explanation in <xref target= "chapters"></xref>.</dd> For more detailed information, see <xref target="chapters"></xref>.</dd>
</dl> </dl>
<section anchor="editionentry-element"><name>EditionEntry Element</name> <section anchor="editionentry-element"><name>EditionEntry Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x45B9 / master</dd> <dd>0x45B9 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains all information about a Segment edition.</dd> <dd>Contains all information about a <tt>Segment</tt> edition.</dd>
</dl> </dl>
<section anchor="editionuid-element"><name>EditionUID Element</name> <section anchor="editionuid-element"><name>EditionUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x45BC / uinteger</dd> <dd>0x45BC / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\EditionUID</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\EditionUID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the edition. It's useful for tagging an edition.</dd <dd>A UID that identifies the edition. It's useful for tagging an edition.</dd>
> <dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="editionflagdefault-element"><name>EditionFlagDefault Element</n ame> <section anchor="editionflagdefault-element"><name>EditionFlagDefault Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x45DB / uinteger / 0</dd> <dd>0x45DB / uinteger / 0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 4444 skipping to change at line 4616
<section anchor="chapteratom-element"><name>ChapterAtom Element</name> <section anchor="chapteratom-element"><name>ChapterAtom Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xB6 / master</dd> <dd>0xB6 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
</dl> <dt>recursive:</dt><dd>True</dd>
<t>recursive: True</t>
<dl spacing="compact">
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains the atom information to use as the chapter atom (apply to all track s).</dd> <dd>Contains the atom information to use as the chapter atom (applies to all tra cks).</dd>
</dl> </dl>
<section anchor="chapteruid-element"><name>ChapterUID Element</name> <section anchor="chapteruid-element"><name>ChapterUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x73C4 / uinteger</dd> <dd>0x73C4 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterUID</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterUID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the Chapter.</dd> <dd>A UID that identifies the <tt>Chapter</tt>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="chapterstringuid-element"><name>ChapterStringUID Element</name> <section anchor="chapterstringuid-element"><name>ChapterStringUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x5654 / utf-8</dd> <dd>0x5654 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterStringUID</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterStringUID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique string ID to identify the Chapter. <dd>A unique string ID that identifies the <tt>Chapter</tt>.
For example it is used as the storage for <xref target="WebVTT"></xref> cue iden
tifier values.</dd> For example, it is used as the storage for cue identifier values <xref target="W
ebVTT"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="chaptertimestart-element"><name>ChapterTimeStart Element</name> <section anchor="chaptertimestart-element"><name>ChapterTimeStart Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x91 / uinteger</dd> <dd>0x91 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterTimeStart</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterTimeStart</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Timestamp of the start of Chapter, expressed in Matroska Ticks -- i.e., in n anoseconds; see <xref target="timestamp-ticks"></xref>.</dd> <dd>Timestamp of the start of <tt>Chapter</tt>, expressed in Matroska Ticks -- i .e., in nanoseconds; see <xref target="timestamp-ticks"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="chaptertimeend-element"><name>ChapterTimeEnd Element</name> <section anchor="chaptertimeend-element"><name>ChapterTimeEnd Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x92 / uinteger</dd> <dd>0x92 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterTimeEnd</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterTimeEnd</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>see implementation notes / 1</dd> <dd>See <xref target="ChapterTimeEndNotes"/> / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Timestamp of the end of Chapter timestamp excluded, expressed in Matroska Ti cks -- i.e., in nanoseconds; see <xref target="timestamp-ticks"></xref>. <dd>Timestamp of the end of <tt>Chapter</tt>, expressed in Matroska Ticks -- i.e ., in nanoseconds; see <xref target="timestamp-ticks"></xref>.
The value <bcp14>MUST</bcp14> be greater than or equal to the <tt>ChapterTimeSta rt</tt> of the same <tt>ChapterAtom</tt>.</dd> The value <bcp14>MUST</bcp14> be greater than or equal to the <tt>ChapterTimeSta rt</tt> of the same <tt>ChapterAtom</tt>.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>The <tt>ChapterTimeEnd</tt> timestamp value being excluded, it <bcp14>MUST</ bcp14> take in account the duration of <dd>With the <tt>ChapterTimeEnd</tt> timestamp value being excluded, it <bcp14>M UST</bcp14> take into account the duration of
the last frame it includes, especially for the <tt>ChapterAtom</tt> using the la st frames of the <tt>Segment</tt>.</dd> the last frame it includes, especially for the <tt>ChapterAtom</tt> using the la st frames of the <tt>Segment</tt>.</dd>
<dt>notes:</dt>
<dd>See <xref target="ChapterTimeEndNotes"/>.</dd>
</dl> </dl>
<t>notes:</t> <table anchor="ChapterTimeEndNotes"><name>ChapterTimeEnd Implementation Notes</n
<table anchor="ChapterTimeEndNotes"><name>ChapterTimeEnd implementation notes</n ame>
ame>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">minOccurs</td> <td align="left">minOccurs</td>
<td align="left">ChapterTimeEnd <bcp14>MUST</bcp14> be set (minOccurs=1) if the Edition is an ordered edition; see <xref target="editionflagordered"></xref>, un less it's a <tt>Parent Chapter</tt>; see <xref target="nested-chapters"></xref>< /td> <td align="left">ChapterTimeEnd <bcp14>MUST</bcp14> be set (minOccurs=1) if the <tt>Edition</tt> is an ordered edition; see <xref target="editionflagordered"></ xref>. If it's a <tt>Parent Chapter</tt>, see <xref target="nested-chapters"></x ref>.</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="chapterflaghidden-element"><name>ChapterFlagHidden Element</nam e> <section anchor="chapterflaghidden-element"><name>ChapterFlagHidden Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x98 / uinteger / 0</dd> <dd>0x98 / uinteger / 0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterFlagHidden</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterFlagHidden</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if a chapter is hidden. Hidden chapters <bcp14>SHOULD NOT</bcp14> b <dd>Set to 1 if a chapter is hidden.
e available to the user interface
(but still to Control Tracks; see <xref target="chapterflaghidden"></xref> on Ch Hidden chapters <bcp14>SHOULD NOT</bcp14> be available to the user interface
apter flags).</dd> (but still be available to Control Tracks; see <xref target="chapterflaghidden">
</xref> on <tt>Chapter</tt> flags).</dd>
</dl> </dl>
</section> </section>
<section anchor="chaptersegmentuuid-element"><name>ChapterSegmentUUID Element</n ame> <section anchor="chaptersegmentuuid-element"><name>ChapterSegmentUUID Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6E67 / binary</dd> <dd>0x6E67 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>16</dd> <dd>16</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterSegmentUUID</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterSegmentUUID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>see implementation notes / 1</dd> <dd>See <xref target="ChapterSegmentUUIDNotes"/> / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The SegmentUUID of another Segment to play during this chapter.</dd> <dd>The <tt>SegmentUUID</tt> of another <tt>Segment</tt> to play during this cha pter.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>The value <bcp14>MUST NOT</bcp14> be the <tt>SegmentUUID</tt> value of the < tt>Segment</tt> it belongs to.</dd> <dd>The value <bcp14>MUST NOT</bcp14> be the <tt>SegmentUUID</tt> value of the < tt>Segment</tt> it belongs to.</dd>
<dt>notes:</dt>
<dd>See <xref target="ChapterSegmentUUIDNotes"/>.</dd>
</dl> </dl>
<t>notes:</t> <table anchor="ChapterSegmentUUIDNotes"><name>ChapterSegmentUUID Implementation
<table anchor="ChapterSegmentUUIDNotes"><name>ChapterSegmentUUID implementation Notes</name>
notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">minOccurs</td> <td align="left">minOccurs</td>
<td align="left">ChapterSegmentUUID <bcp14>MUST</bcp14> be set (minOccurs=1) if ChapterSegmentEditionUID is used; see <xref target="medium-linking"></xref> on m edium-linking Segments.</td> <td align="left">ChapterSegmentUUID <bcp14>MUST</bcp14> be set (minOccurs=1) if ChapterSegmentEditionUID is used; see <xref target="medium-linking"></xref> on M edium-Linking <tt>Segments</tt>.</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="chaptersegmenteditionuid-element"><name>ChapterSegmentEditionUI D Element</name> <section anchor="chaptersegmenteditionuid-element"><name>ChapterSegmentEditionUI D Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6EBC / uinteger</dd> <dd>0x6EBC / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterSegmentEditionUID</tt ></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterSegmentEditionUID</tt ></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The EditionUID to play from the Segment linked in ChapterSegmentUUID. <dd>The <tt>EditionUID</tt> to play from the <tt>Segment</tt> linked in <tt>Chap
If ChapterSegmentEditionUID is undeclared, then no Edition of the linked Segment terSegmentUUID</tt>.
is used; see <xref target="medium-linking"></xref> on medium-linking Segments.< If <tt>ChapterSegmentEditionUID</tt> is undeclared, then no <tt>Edition</tt> of
/dd> the linked <tt>Segment</tt> is used; see <xref target="medium-linking"></xref> o
n Medium-Linking <tt>Segments</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapterphysicalequiv-element"><name>ChapterPhysicalEquiv Elemen t</name> <section anchor="chapterphysicalequiv-element"><name>ChapterPhysicalEquiv Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x63C3 / uinteger</dd> <dd>0x63C3 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterPhysicalEquiv</tt></d d> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterPhysicalEquiv</tt></d d>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify the physical equivalent of this ChapterAtom like &quot;DVD&quot; (60 ) or &quot;SIDE&quot; (50); <dd>Specifies the physical equivalent of this <tt>ChapterAtom</tt>, e.g., "DVD" (60) or "SIDE" (50);
see <xref target="physical-types"></xref> for a complete list of values.</dd> see <xref target="physical-types"></xref> for a complete list of values.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapterdisplay-element"><name>ChapterDisplay Element</name> <section anchor="chapterdisplay-element"><name>ChapterDisplay Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x80 / master</dd> <dd>0x80 / master</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 4653 skipping to change at line 4829
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x437C / string / eng</dd> <dd>0x437C / string / eng</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterDisplay\ChapLanguage< /tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterDisplay\ChapLanguage< /tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A language corresponding to the string, <dd>A language corresponding to the string,
in the Matroska languages form; see <xref target="language-codes"></xref> on lan guage codes. in the Matroska languages form; see <xref target="language-codes"></xref> on lan guage codes.
This Element <bcp14>MUST</bcp14> be ignored if a ChapLanguageBCP47 Element is us ed within the same ChapterDisplay Element.</dd> This Element <bcp14>MUST</bcp14> be ignored if a <tt>ChapLanguageBCP47</tt> Elem ent is used within the same <tt>ChapterDisplay</tt> Element.</dd>
</dl> </dl>
</section> </section>
<section anchor="chaplanguagebcp47-element"><name>ChapLanguageBCP47 Element</nam e> <section anchor="chaplanguagebcp47-element"><name>ChapLanguageBCP47 Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x437D / string</dd> <dd>0x437D / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterDisplay\ChapLanguageB CP47</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterDisplay\ChapLanguageB CP47</tt></dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A language corresponding to the ChapString, <dd>A language corresponding to the <tt>ChapString</tt>,
in the <xref target="BCP47"></xref> form; see <xref target="language-codes"></xr in the form defined in <xref target="RFC5646"></xref>; see <xref target="languag
ef> on language codes. e-codes"></xref> on language codes.
If a ChapLanguageBCP47 Element is used, then any ChapLanguage and ChapCountry El If a <tt>ChapLanguageBCP47</tt> Element is used, then any <tt>ChapLanguage</tt>
ements used in the same ChapterDisplay <bcp14>MUST</bcp14> be ignored.</dd> and <tt>ChapCountry</tt> Elements used in the same <tt>ChapterDisplay</tt> <bcp1
4>MUST</bcp14> be ignored.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapcountry-element"><name>ChapCountry Element</name> <section anchor="chapcountry-element"><name>ChapCountry Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x437E / string</dd> <dd>0x437E / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterDisplay\ChapCountry</ tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterDisplay\ChapCountry</ tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A country corresponding to the string, <dd>A country corresponding to the string,
in the Matroska countries form; see <xref target="country-codes"></xref> on coun try codes. in the Matroska countries form; see <xref target="country-codes"></xref> on coun try codes.
This Element <bcp14>MUST</bcp14> be ignored if a ChapLanguageBCP47 Element is us ed within the same ChapterDisplay Element.</dd> This Element <bcp14>MUST</bcp14> be ignored if a <tt>ChapLanguageBCP47</tt> Elem ent is used within the same <tt>ChapterDisplay</tt> Element.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapprocess-element"><name>ChapProcess Element</name> <section anchor="chapprocess-element"><name>ChapProcess Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6944 / master</dd> <dd>0x6944 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains all the commands associated to the Atom.</dd> <dd>Contains all the commands associated with the Atom.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapprocesscodecid-element"><name>ChapProcessCodecID Element</n ame> <section anchor="chapprocesscodecid-element"><name>ChapProcessCodecID Element</n ame>
<!-- [rfced] We have two questions about the definition below:
a) Does "to be defined" need further clarification, perhaps "to be defined in
future specifications"?
b) Section 20.3 defines value 0 as "matroska script" and value 1 as "menu
borrowed from the DVD [DVD-Video]". Should the definitions match? Or is the
current okay?
Original:
definition: Contains the type of the codec used for the processing.
A value of 0 means built-in Matroska processing (to be defined), a value of 1
means the DVD command set is used; see Section 20.3 on DVD menus.
-->
<!-- [cellar] "to be defined" should actually refer to this CELLAR document:
https://datatracker.ietf.org/doc/bibxml3/reference.I-D.ietf-cellar-chapter-
codecs.xml
0 should indeed be referred to as Matroska Script. So the new text should be
something like this:
definition: Contains the type of the codec used for the processing. A value
of 0 means "Matroska Script" processing (see <xref
target="I-D.ietf-cellar-chapter-codecs"></xref>), a value of 1 means the
"DVD-menu" command set is used; see Section 20.3 on DVD menus.
-->
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x6955 / uinteger / 0</dd> <dd>0x6955 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessCodec ID</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessCodec ID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains the type of the codec used for the processing. <dd>Contains the type of the codec used for processing.
A value of 0 means built-in Matroska processing (to be defined), a value of 1 me A value of 0 means built-in Matroska processing (to be defined), and a value of
ans the DVD command set is used; see <xref target="menu-features"></xref> on DVD 1 means the DVD command set is used; see <xref target="menu-features"></xref> on
menus. DVD menus.
More codec IDs can be added later.</dd> More codec IDs can be added later.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapprocessprivate-element"><name>ChapProcessPrivate Element</n ame> <section anchor="chapprocessprivate-element"><name>ChapProcessPrivate Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x450D / binary</dd> <dd>0x450D / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessPriva te</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessPriva te</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Some optional data attached to the ChapProcessCodecID information. <dd>Optional data attached to the <tt>ChapProcessCodecID</tt> information.
For ChapProcessCodecID = 1, it is the &quot;DVD level&quot; equivalent; see <xre For <tt>ChapProcessCodecID</tt> = 1, it is the "DVD level" equivalent; see <xref
f target="menu-features"></xref> on DVD menus.</dd> target="menu-features"></xref> on DVD menus.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapprocesscommand-element"><name>ChapProcessCommand Element</n ame> <section anchor="chapprocesscommand-element"><name>ChapProcessCommand Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6911 / master</dd> <dd>0x6911 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains all the commands associated to the Atom.</dd> <dd>Contains all the commands associated with the Atom.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapprocesstime-element"><name>ChapProcessTime Element</name> <section anchor="chapprocesstime-element"><name>ChapProcessTime Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6922 / uinteger</dd> <dd>0x6922 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd\ChapProcessTime</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd\ChapProcessTime</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Defines when the process command <bcp14>SHOULD</bcp14> be handled</dd> <dd>Defines when the process command <bcp14>SHOULD</bcp14> be handled.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="ChapProcessTimeValues"/>.</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="ChapProcessTimeValues"><name>ChapProcessTime Values</name>
<table anchor="ChapProcessTimeValues"><name>ChapProcessTime values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 4779 skipping to change at line 4982
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">before starting playback</td> <td align="left">before starting playback</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">after playback of the chapter</td> <td align="left">after playback of the chapter</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="chapprocessdata-element"><name>ChapProcessData Element</name> <section anchor="chapprocessdata-element"><name>ChapProcessData Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6933 / binary</dd> <dd>0x6933 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd\ChapProcessData</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd\ChapProcessData</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains the command information. <dd>Contains the command information.
The data <bcp14>SHOULD</bcp14> be interpreted depending on the ChapProcessCodecI D value. For ChapProcessCodecID = 1, The data <bcp14>SHOULD</bcp14> be interpreted depending on the <tt>ChapProcessCo decID</tt> value. For <tt>ChapProcessCodecID</tt> = 1,
the data correspond to the binary DVD cell pre/post commands; see <xref target=" menu-features"></xref> on DVD menus.</dd> the data correspond to the binary DVD cell pre/post commands; see <xref target=" menu-features"></xref> on DVD menus.</dd>
</dl> </dl>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
<section anchor="tags-element"><name>Tags Element</name> <section anchor="tags-element"><name>Tags Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1254C367 / master</dd> <dd>0x1254C367 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags</tt></dd> <dd><tt>\Segment\Tags</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Element containing metadata describing Tracks, Editions, Chapters, Attachmen <dd>Element containing metadata describing <tt>Tracks</tt>, <tt>Editions</tt>, <
ts, or the Segment as a whole. tt>Chapters</tt>, <tt>Attachments</tt>, or the <tt>Segment</tt> as a whole.
A list of valid tags can be found in <xref target="MatroskaTags"></xref>.</dd> A list of valid tags can be found in <xref target="I-D.ietf-cellar-tags"></xref>
.</dd>
</dl> </dl>
<section anchor="tag-element"><name>Tag Element</name> <section anchor="tag-element"><name>Tag Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x7373 / master</dd> <dd>0x7373 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag</tt></dd> <dd><tt>\Segment\Tags\Tag</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
skipping to change at line 4836 skipping to change at line 5040
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x63C0 / master</dd> <dd>0x63C0 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specifies which other elements the metadata represented by the Tag applies t o. <dd>Specifies which other elements the metadata represented by the Tag applies t o.
If empty or omitted, then the Tag describes everything in the Segment.</dd> If empty or omitted, then the Tag describes everything in the <tt>Segment</tt>.< /dd>
</dl> </dl>
<section anchor="targettypevalue-element"><name>TargetTypeValue Element</name> <section anchor="targettypevalue-element"><name>TargetTypeValue Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x68CA / uinteger / 50</dd> <dd>0x68CA / uinteger / 50</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TargetTypeValue</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TargetTypeValue</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A number to indicate the logical level of the target.</dd> <dd>A number to indicate the logical level of the target.</dd>
<dt>defined values:</dt>
<dd>See <xref target="TargetTypeValueValues"/>.</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="TargetTypeValueValues"><name>TargetTypeValue Values</name>
<table anchor="TargetTypeValueValues"><name>TargetTypeValue values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 4877 skipping to change at line 5082
<tr> <tr>
<td align="left"><tt>60</tt></td> <td align="left"><tt>60</tt></td>
<td align="left">EDITION / ISSUE / VOLUME / OPUS / SEASON / SEQUEL</td> <td align="left">EDITION / ISSUE / VOLUME / OPUS / SEASON / SEQUEL</td>
<td align="left">A list of lower levels grouped together.</td> <td align="left">A list of lower levels grouped together.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>50</tt></td> <td align="left"><tt>50</tt></td>
<td align="left">ALBUM / OPERA / CONCERT / MOVIE / EPISODE</td> <td align="left">ALBUM / OPERA / CONCERT / MOVIE / EPISODE</td>
<td align="left">The most common grouping level of music and video (equals to an episode for TV series).</td> <td align="left">The most common grouping level of music and video (e.g., an epi sode for TV series).</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>40</tt></td> <td align="left"><tt>40</tt></td>
<td align="left">PART / SESSION</td> <td align="left">PART / SESSION</td>
<td align="left">When an album or episode has different logical parts.</td> <td align="left">When an album or episode has different logical parts.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>30</tt></td> <td align="left"><tt>30</tt></td>
<td align="left">TRACK / SONG / CHAPTER</td> <td align="left">TRACK / SONG / CHAPTER</td>
<td align="left">The common parts of an album or movie.</td> <td align="left">The common parts of an album or movie.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>20</tt></td> <td align="left"><tt>20</tt></td>
<td align="left">SUBTRACK / MOVEMENT / SCENE</td> <td align="left">SUBTRACK / MOVEMENT / SCENE</td>
<td align="left">Corresponds to parts of a track for audio like a movement, or a scene in a movie.</td> <td align="left">Corresponds to parts of a track for audio, such as a movement o r scene in a movie.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>10</tt></td> <td align="left"><tt>10</tt></td>
<td align="left">SHOT</td> <td align="left">SHOT</td>
<td align="left">The lowest hierarchy found in music or movies.</td> <td align="left">The lowest hierarchy found in music or movies.</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="targettype-element"><name>TargetType Element</name> <section anchor="targettype-element"><name>TargetType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x63CA / string</dd> <dd>0x63CA / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TargetType</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TargetType</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>An informational string that can be used to display the logical level of the <dd>An informational string that can be used to display the logical level of the
target like &quot;ALBUM&quot;, &quot;TRACK&quot;, &quot;MOVIE&quot;, &quot;CHAP target, such as "ALBUM", "TRACK", "MOVIE", "CHAPTER", etc.</dd>
TER&quot;, etc.</dd> <dt>restrictions:</dt>
<dd>See <xref target="TargetTypeValues"/>.</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="TargetTypeValues"><name>TargetType Values</name>
<table anchor="TargetTypeValues"><name>TargetType values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>COLLECTION</tt></td> <td align="left"><tt>COLLECTION</tt></td>
skipping to change at line 5033 skipping to change at line 5240
<tr> <tr>
<td align="left"><tt>SCENE</tt></td> <td align="left"><tt>SCENE</tt></td>
<td align="left">TargetTypeValue 20</td> <td align="left">TargetTypeValue 20</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>SHOT</tt></td> <td align="left"><tt>SHOT</tt></td>
<td align="left">TargetTypeValue 10</td> <td align="left">TargetTypeValue 10</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="tagtrackuid-element"><name>TagTrackUID Element</name> <section anchor="tagtrackuid-element"><name>TagTrackUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x63C5 / uinteger / 0</dd> <dd>0x63C5 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TagTrackUID</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TagTrackUID</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the Track(s) the tags belong to.</dd> <dd>A UID that identifies the <tt>Track(s)</tt> that the tags belong to.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the value is 0 at this level, the tags apply to all tracks in the Segment <dd>If the value is 0 at this level, the tags apply to all tracks in the <tt>Seg
. ment</tt>.
If set to any other value, it <bcp14>MUST</bcp14> match the <tt>TrackUID</tt> va If set to any other value, it <bcp14>MUST</bcp14> match the <tt>TrackUID</tt> va
lue of a track found in this Segment.</dd> lue of a track found in this <tt>Segment</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="tageditionuid-element"><name>TagEditionUID Element</name> <section anchor="tageditionuid-element"><name>TagEditionUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x63C9 / uinteger / 0</dd> <dd>0x63C9 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TagEditionUID</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TagEditionUID</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the EditionEntry(s) the tags belong to.</dd> <dd>A UID that identifies the <tt>EditionEntry(s)</tt> that the tags belong to.< /dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the value is 0 at this level, the tags apply to all editions in the Segme <dd>If the value is 0 at this level, the tags apply to all editions in the <tt>S
nt. egment</tt>.
If set to any other value, it <bcp14>MUST</bcp14> match the <tt>EditionUID</tt> If set to any other value, it <bcp14>MUST</bcp14> match the <tt>EditionUID</tt>
value of an edition found in this Segment.</dd> value of an edition found in this <tt>Segment</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="tagchapteruid-element"><name>TagChapterUID Element</name> <section anchor="tagchapteruid-element"><name>TagChapterUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x63C4 / uinteger / 0</dd> <dd>0x63C4 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TagChapterUID</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TagChapterUID</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the Chapter(s) the tags belong to.</dd> <dd>A UID that identifies the <tt>Chapter(s)</tt> that the tags belong to.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the value is 0 at this level, the tags apply to all chapters in the Segme <dd>If the value is 0 at this level, the tags apply to all chapters in the <tt>S
nt. egment</tt>.
If set to any other value, it <bcp14>MUST</bcp14> match the <tt>ChapterUID</tt> If set to any other value, it <bcp14>MUST</bcp14> match the <tt>ChapterUID</tt>
value of a chapter found in this Segment.</dd> value of a chapter found in this <tt>Segment</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="tagattachmentuid-element"><name>TagAttachmentUID Element</name> <section anchor="tagattachmentuid-element"><name>TagAttachmentUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x63C6 / uinteger / 0</dd> <dd>0x63C6 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TagAttachmentUID</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TagAttachmentUID</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the Attachment(s) the tags belong to.</dd> <dd>A UID that identifies the Attachment(s) that the tags belong to.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the value is 0 at this level, the tags apply to all the attachments in th <dd>If the value is 0 at this level, the tags apply to all the attachments in
e Segment. the <tt>Segment</tt>. If set to any other value, it <bcp14>MUST</bcp14> match
If set to any other value, it <bcp14>MUST</bcp14> match the <tt>FileUID</tt> val the <tt>FileUID</tt> value of an attachment found in this <tt>Segment</tt>.</dd>
ue of an attachment found in this Segment.</dd>
</dl> </dl>
</section> </section>
</section> </section>
<section anchor="simpletag-element"><name>SimpleTag Element</name> <section anchor="simpletag-element"><name>SimpleTag Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x67C8 / master</dd> <dd>0x67C8 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\+SimpleTag</tt></dd> <dd><tt>\Segment\Tags\Tag\+SimpleTag</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
</dl> <dt>recursive:</dt><dd>True</dd>
<t>recursive: True</t>
<dl spacing="compact">
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains general information about the target.</dd> <dd>Contains general information about the target.</dd>
</dl> </dl>
<section anchor="tagname-element"><name>TagName Element</name> <section anchor="tagname-element"><name>TagName Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x45A3 / utf-8</dd> <dd>0x45A3 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 5137 skipping to change at line 5344
<section anchor="taglanguage-element"><name>TagLanguage Element</name> <section anchor="taglanguage-element"><name>TagLanguage Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x447A / string / und</dd> <dd>0x447A / string / und</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\+SimpleTag\TagLanguage</tt></dd> <dd><tt>\Segment\Tags\Tag\+SimpleTag\TagLanguage</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specifies the language of the tag specified, <dd>Specifies the language of the specified tag in the Matroska languages form;
in the Matroska languages form; see <xref target="language-codes"></xref> on lan see <xref target="language-codes"></xref> on language codes.
guage codes. This Element <bcp14>MUST</bcp14> be ignored if the <tt>TagLanguageBCP47</tt> Ele
This Element <bcp14>MUST</bcp14> be ignored if the TagLanguageBCP47 Element is u ment is used within the same <tt>SimpleTag</tt> Element.</dd>
sed within the same SimpleTag Element.</dd>
</dl> </dl>
</section> </section>
<section anchor="taglanguagebcp47-element"><name>TagLanguageBCP47 Element</name> <section anchor="taglanguagebcp47-element"><name>TagLanguageBCP47 Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x447B / string</dd> <dd>0x447B / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\+SimpleTag\TagLanguageBCP47</tt></dd> <dd><tt>\Segment\Tags\Tag\+SimpleTag\TagLanguageBCP47</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The language used in the TagString, <dd>The language used in the <tt>TagString</tt>,
in the <xref target="BCP47"></xref> form; see <xref target="language-codes"></xr in the form defined in <xref target="RFC5646"></xref>; see <xref target="languag
ef> on language codes. e-codes"></xref> on language codes.
If this Element is used, then any TagLanguage Elements used in the same SimpleTa If this Element is used, then any <tt>TagLanguage</tt> Elements used in the same
g <bcp14>MUST</bcp14> be ignored.</dd> <tt>SimpleTag</tt> <bcp14>MUST</bcp14> be ignored.</dd>
</dl> </dl>
</section> </section>
<section anchor="tagdefault-element"><name>TagDefault Element</name> <section anchor="tagdefault-element"><name>TagDefault Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x4484 / uinteger / 1</dd> <dd>0x4484 / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
skipping to change at line 5201 skipping to change at line 5407
<section anchor="tagbinary-element"><name>TagBinary Element</name> <section anchor="tagbinary-element"><name>TagBinary Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4485 / binary</dd> <dd>0x4485 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\+SimpleTag\TagBinary</tt></dd> <dd><tt>\Segment\Tags\Tag\+SimpleTag\TagBinary</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The values of the Tag, if it is binary. Note that this cannot be used in the same SimpleTag as TagString.</dd> <dd>The values of the Tag if it is binary. Note that this cannot be used in the same <tt>SimpleTag</tt> as <tt>TagString</tt>.</dd>
</dl> </dl>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
<section anchor="matroska-element-ordering"><name>Matroska Element Ordering</nam e> <section anchor="matroska-element-ordering"><name>Matroska Element Ordering</nam e>
<t>Except for the <tt>EBML Header</tt> and the <tt>CRC-32 Element</tt>, the EBML <t>With the exceptions of the <tt>EBML Header</tt> and the <tt>CRC-32 Element</t
specification does not t>, the EBML specification <xref target="RFC8794"></xref> does not
require any particular storage order for <tt>Elements</tt>. This specification h require any particular storage order for <tt>Elements</tt>.
owever However, this specification defines mandates and recommendations for ordering
defines mandates and recommendations for ordering certain <tt>Elements</tt> in o certain <tt>Elements</tt> to facilitate better playback, seeking, and editing
rder to facilitate efficiency. This section describes and offers rationale for ordering
better playback, seeking, and editing efficiency. This section describes and off requirements and recommendations for Matroska.</t>
ers
rationale for ordering requirements and recommendations for Matroska.</t>
<section anchor="top-level-elements"><name>Top-Level Elements</name> <section anchor="top-level-elements"><name>Top-Level Elements</name>
<t>The <tt>Info Element</tt> is the only <bcp14>REQUIRED</bcp14> <tt>Top-Level E lement</tt> in a Matroska file. <t>The <tt>Info Element</tt> is the only <bcp14>REQUIRED</bcp14> <tt>Top-Level E lement</tt> in a Matroska file.
To be playable, Matroska <bcp14>MUST</bcp14> also contain at least one <tt>Track s Element</tt> and <tt>Cluster Element</tt>. To be playable, Matroska <bcp14>MUST</bcp14> also contain at least one <tt>Track s Element</tt> and <tt>Cluster Element</tt>.
The first <tt>Info Element</tt> and the first <tt>Tracks Element</tt> <bcp14>MUS The first <tt>Info Element</tt> and the first <tt>Tracks Element</tt> either <bc
T</bcp14> either be stored before the first p14>MUST</bcp14> be stored before the first
<tt>Cluster Element</tt> or both <bcp14>SHALL</bcp14> be referenced by a <tt>See <tt>Cluster Element</tt> or <bcp14>SHALL</bcp14> both be referenced by a <tt>See
kHead Element</tt> occurring before the first <tt>Cluster Element</tt>.</t> kHead Element</tt> occurring before the first <tt>Cluster Element</tt>.</t>
<t>All <tt>Top-Level Elements</tt> <bcp14>MUST</bcp14> use a 4-octet long EBML E <t>All <tt>Top-Level Elements</tt> <bcp14>MUST</bcp14> use a 4-octet EBML Elemen
lement ID.</t> t ID.</t>
<t>When using Medium Linking, chapters are used to reference other Segments to p <t>When using Medium Linking, chapters are used to reference other <tt>Segments<
lay in a given order <xref target="medium-linking"></xref>. /tt> to play in a given order (see <xref target="medium-linking"></xref>).
A Segment containing these linked Chapters does not require a <tt>Track</tt> Ele A <tt>Segment</tt> containing these <tt>Linked Chapters</tt> does not require a
ment or a <tt>Cluster</tt> Element.</t> <tt>Track</tt> Element or a <tt>Cluster</tt> Element.</t>
<t>It is possible to edit a Matroska file after it has been created. For example , chapters, <t>It is possible to edit a Matroska file after it has been created. For example , chapters,
tags, or attachments can be added. When new <tt>Top-Level Elements</tt> are adde d to a Matroska file, tags, or attachments can be added. When new <tt>Top-Level Elements</tt> are adde d to a Matroska file,
the <tt>SeekHead</tt> Element(s) <bcp14>MUST</bcp14> be updated so that the <tt> SeekHead</tt> Element(s) itemize the <tt>SeekHead</tt> Element(s) <bcp14>MUST</bcp14> be updated so that the <tt> SeekHead</tt> Element(s) itemizes
the identity and position of all <tt>Top-Level Elements</tt>.</t> the identity and position of all <tt>Top-Level Elements</tt>.</t>
<t>Editing, removing, or adding <t>Editing, removing, or adding
<tt>Elements</tt> to a Matroska file often requires that some existing <tt>Eleme nts</tt> be voided <tt>Elements</tt> to a Matroska file often requires that some existing <tt>Eleme nts</tt> be voided
or extended. or extended.
Transforming the existing <tt>Elements</tt> into <tt>Void Elements</tt> as paddi ng can be used Transforming the existing <tt>Elements</tt> into <tt>Void Elements</tt> as paddi ng can be used
as a method to avoid moving large amounts of data around.</t> as a method to avoid moving large amounts of data around.</t>
</section> </section>
<section anchor="crc-32"><name>CRC-32</name> <section anchor="crc-32"><name>CRC-32</name>
<t>As noted by the EBML specification, if a <tt>CRC-32 Element</tt> is used, the <t>As noted by the EBML specification <xref target="RFC8794"></xref>, if a <tt>C
n the <tt>CRC-32 Element</tt> RC-32 Element</tt> is used, then the <tt>CRC-32 Element</tt>
<bcp14>MUST</bcp14> be the first ordered <tt>Element</tt> within its <tt>Parent <bcp14>MUST</bcp14> be the first ordered Element within its <tt>Parent Element</
Element</tt>.</t> tt>.</t>
<t>In Matroska all <tt>Top-Level Elements</tt> of an EBML Document <bcp14>SHOULD <t>In Matroska, all <tt>Top-Level Elements</tt> of an EBML Document <bcp14>SHOUL
</bcp14> include a <tt>CRC-32 Element</tt> D</bcp14> include a <tt>CRC-32 Element</tt>
as their first <tt>Child Element</tt>. as their first <tt>Child Element</tt>.
The <tt>Segment Element</tt>, which is the <tt>Root Element</tt>, <bcp14>SHOULD NOT</bcp14> have a <tt>CRC-32 Element</tt>.</t> The <tt>Segment Element</tt>, which is the <tt>Root Element</tt>, <bcp14>SHOULD NOT</bcp14> have a <tt>CRC-32 Element</tt>.</t>
</section> </section>
<section anchor="seekhead"><name>SeekHead</name> <section anchor="seekhead"><name>SeekHead</name>
<t>If used, the first <tt>SeekHead Element</tt> <bcp14>MUST</bcp14> be the first non-<tt>CRC-32 Child Element</tt> <t>If used, the first <tt>SeekHead Element</tt> <bcp14>MUST</bcp14> be the first non-<tt>CRC-32 Child Element</tt>
of the <tt>Segment Element</tt>. If a second <tt>SeekHead Element</tt> is used, then the first of the <tt>Segment Element</tt>. If a second <tt>SeekHead Element</tt> is used, then the first
<tt>SeekHead Element</tt> <bcp14>MUST</bcp14> reference the identity and positio n of the second <tt>SeekHead</tt>.</t> <tt>SeekHead Element</tt> <bcp14>MUST</bcp14> reference the identity and positio n of the second <tt>SeekHead Element</tt>.</t>
<t>Additionally, the second <tt>SeekHead Element</tt> <bcp14>MUST</bcp14> only r eference <tt>Cluster</tt> Elements <t>Additionally, the second <tt>SeekHead Element</tt> <bcp14>MUST</bcp14> only r eference <tt>Cluster</tt> Elements
and not any other <tt>Top-Level Element</tt> already contained within the first <tt>SeekHead Element</tt>.</t> and not any other <tt>Top-Level Element</tt> already contained within the first <tt>SeekHead Element</tt>.</t>
<t>The second <tt>SeekHead Element</tt> <bcp14>MAY</bcp14> be stored in any orde r relative to the other <tt>Top-Level Elements</tt>. <t>The second <tt>SeekHead Element</tt> <bcp14>MAY</bcp14> be stored in any orde r relative to the other <tt>Top-Level Elements</tt>.
Whether one or two <tt>SeekHead Element(s)</tt> are used, the <tt>SeekHead Eleme nt(s)</tt> <bcp14>MUST</bcp14> Whether one or two <tt>SeekHead Elements</tt> are used, the <tt>SeekHead Element (s)</tt> <bcp14>MUST</bcp14>
collectively reference the identity and position of all <tt>Top-Level Elements</ tt> except collectively reference the identity and position of all <tt>Top-Level Elements</ tt> except
for the first <tt>SeekHead Element</tt>.</t> for the first <tt>SeekHead Element</tt>.</t>
</section> </section>
<section anchor="cues-index"><name>Cues (index)</name> <section anchor="cues-index"><name>Cues (Index)</name>
<t>The <tt>Cues Element</tt> is <bcp14>RECOMMENDED</bcp14> to optimize seeking a ccess in Matroska. It is <t>The <tt>Cues Element</tt> is <bcp14>RECOMMENDED</bcp14> to optimize seeking a ccess in Matroska. It is
programmatically simpler to add the <tt>Cues Element</tt> after all <tt>Cluster Elements</tt> programmatically simpler to add the <tt>Cues Element</tt> after all <tt>Cluster Elements</tt>
have been written because this does not require a prediction of how much space t o have been written because this does not require a prediction of how much space t o
reserve before writing the <tt>Cluster Elements</tt>. However, storing the <tt>C ues Element</tt> reserve before writing the <tt>Cluster Elements</tt>. However, storing the <tt>C ues Element</tt>
before the <tt>Cluster Elements</tt> can provide some seeking advantages. If the <tt>Cues Element</tt> before the <tt>Cluster Elements</tt> can provide some seeking advantages. If the <tt>Cues Element</tt>
is present, then it <bcp14>SHOULD</bcp14> either be stored before the first <tt> Cluster Element</tt> is present, then it <bcp14>SHOULD</bcp14> either be stored before the first <tt> Cluster Element</tt>
or be referenced by a <tt>SeekHead Element</tt>.</t> or be referenced by a <tt>SeekHead Element</tt>.</t>
</section> </section>
<section anchor="info"><name>Info</name> <section anchor="info"><name>Info</name>
<t>The first <tt>Info Element</tt> <bcp14>SHOULD</bcp14> occur before the first <tt>Tracks Element</tt> and first <t>The first <tt>Info Element</tt> <bcp14>SHOULD</bcp14> occur before the first <tt>Tracks Element</tt> and first
<tt>Cluster Element</tt> except when referenced by a <tt>SeekHead Element</tt>.< /t> <tt>Cluster Element</tt> except when referenced by a <tt>SeekHead Element</tt>.< /t>
</section> </section>
<section anchor="chapters-element-1"><name>Chapters Element</name> <section anchor="chapters-element-1"><name>Chapters Element</name>
<t>The <tt>Chapters Element</tt> <bcp14>SHOULD</bcp14> be placed before the <tt> Cluster Element(s)</tt>. The <t>The <tt>Chapters Element</tt> <bcp14>SHOULD</bcp14> be placed before the <tt> Cluster Element(s)</tt>. The
<tt>Chapters Element</tt> can be used during playback even if the user does not need to seek. <tt>Chapters Element</tt> can be used during playback even if the user does not need to seek.
It immediately gives the user information about what section is being read and w hat It immediately gives the user information about what section is being read and w hat
other sections are available. In the case of Ordered Chapters it is <bcp14>RECOM other sections are available.
MENDED</bcp14> to evaluate
the logical linking even before playing. The <tt>Chapters Element</tt> <bcp14>SH In the case of <tt>Ordered Chapters</tt>, it is <bcp14>RECOMMENDED</bcp14> to ev
OULD</bcp14> be placed before aluate
the logical linking before playing. The <tt>Chapters Element</tt> <bcp14>SHOULD<
/bcp14> be placed before
the first <tt>Tracks Element</tt> and after the first <tt>Info Element</tt>.</t> the first <tt>Tracks Element</tt> and after the first <tt>Info Element</tt>.</t>
</section> </section>
<section anchor="attachments"><name>Attachments</name> <section anchor="attachments"><name>Attachments</name>
<t>The <tt>Attachments Element</tt> is not intended to be used by default when p laying the file, <t>The <tt>Attachments Element</tt> is not intended to be used by default when p laying the file
but could contain information relevant to the content, such as cover art or font s. but could contain information relevant to the content, such as cover art or font s.
Cover art is useful even before the file is played and fonts could be needed bef Cover art is useful even before the file is played, and fonts could be needed be
ore playback fore playback
starts for initialization of subtitles. The <tt>Attachments Element</tt> <bcp14> starts for the initialization of subtitles. The <tt>Attachments Element</tt> <bc
MAY</bcp14> be placed before p14>MAY</bcp14> be placed before
the first <tt>Cluster Element</tt>; however, if the <tt>Attachments Element</tt> is likely to be edited, the first <tt>Cluster Element</tt>; however, if the <tt>Attachments Element</tt> is likely to be edited,
then it <bcp14>SHOULD</bcp14> be placed after the last <tt>Cluster Element</tt>. </t> then it <bcp14>SHOULD</bcp14> be placed after the last <tt>Cluster Element</tt>. </t>
</section> </section>
<section anchor="tags"><name>Tags</name> <section anchor="tags"><name>Tags</name>
<t>The <tt>Tags Element</tt> is most subject to changes after the file was origi nally created. <t>The <tt>Tags Element</tt> is most subject to changes after the file was origi nally created.
For easier editing, the <tt>Tags Element</tt> can be placed at the end of the <t t>Segment Element</tt>, For easier editing, the <tt>Tags Element</tt> can be placed at the end of the <t t>Segment Element</tt>,
even after the <tt>Attachments Element</tt>. On the other hand, it is inconvenie nt to have to even after the <tt>Attachments Element</tt>. On the other hand, it is inconvenie nt to have to
seek in the <tt>Segment</tt> for tags, especially for network streams. So it's b etter if the seek in the <tt>Segment</tt> for tags, especially for network streams; thus, it' s better if the
<tt>Tags Element</tt> is found early in the stream. When editing the <tt>Tags El ement</tt>, the original <tt>Tags Element</tt> is found early in the stream. When editing the <tt>Tags El ement</tt>, the original
<tt>Tags Element</tt> at the beginning can be overwritten with a <tt>Void Elemen t</tt> and a <tt>Tags Element</tt> at the beginning can be overwritten with a <tt>Void Elemen t</tt> and a
new <tt>Tags Element</tt> written at the end of the <tt>Segment Element</tt>. Th e file and Segment sizes will only marginally change.</t> new <tt>Tags Element</tt> written at the end of the <tt>Segment Element</tt>. Th e file and <tt>Segment</tt> sizes will only marginally change.</t>
</section> </section>
</section> </section>
<section anchor="matroska-versioning"><name>Matroska versioning</name> <section anchor="matroska-versioning"><name>Matroska Versioning</name>
<t>Matroska is based upon the principle that a reading application does not have <t>Matroska is based on the principle that a reading application does not have t
to support o support
100% of the specifications in order to be able to play the file. A Matroska file 100% of the specifications in order to be able to play the file. Therefore, a Ma
therefore troska file contains version indicators that tell a reading application what to
contains version indicators that tell a reading application what to expect.</t> expect.</t>
<t>It is possible and valid to have the version fields indicate that the file co ntains <t>It is possible and valid to have the version fields indicate that the file co ntains
Matroska <tt>Elements</tt> from a higher specification version number while sign aling that a Matroska <tt>Elements</tt> from a higher specification version number while sign aling that a
reading application <bcp14>MUST</bcp14> only support a lower version number prop erly in order to play reading application <bcp14>MUST</bcp14> only support a lower version number prop erly in order to play
it back (possibly with a reduced feature set).</t> it back (possibly with a reduced feature set).</t>
<t>The <tt>EBML Header</tt> of each Matroska document informs the reading applic ation on what <t>The <tt>EBML Header</tt> of each Matroska document informs the reading applic ation on what
version of Matroska to expect. The <tt>Elements</tt> within <tt>EBML Header</tt> with jurisdiction version of Matroska to expect. The <tt>Elements</tt> within the <tt>EBML Header< /tt> with jurisdiction
over this information are <tt>DocTypeVersion</tt> and <tt>DocTypeReadVersion</tt >.</t> over this information are <tt>DocTypeVersion</tt> and <tt>DocTypeReadVersion</tt >.</t>
<t><tt>DocTypeVersion</tt> <bcp14>MUST</bcp14> be equal to or greater than the h ighest Matroska version number of <t><tt>DocTypeVersion</tt> <bcp14>MUST</bcp14> be equal to or greater than the h ighest Matroska version number of
any <tt>Element</tt> present in the Matroska file. For example, a file using the <tt>SimpleBlock Element</tt> (<xref target="simpleblock-element"></xref>) any Element present in the Matroska file. For example, a file using the <tt>Simp leBlock Element</tt> (<xref target="simpleblock-element"></xref>)
<bcp14>MUST</bcp14> have a <tt>DocTypeVersion</tt> equal to or greater than 2. A file containing <tt>CueRelativePosition</tt> <bcp14>MUST</bcp14> have a <tt>DocTypeVersion</tt> equal to or greater than 2. A file containing <tt>CueRelativePosition</tt>
Elements (<xref target="cuerelativeposition-element"></xref>) <bcp14>MUST</bcp1 4> have a <tt>DocTypeVersion</tt> equal to or greater than 4.</t> Elements (<xref target="cuerelativeposition-element"></xref>) <bcp14>MUST</bcp1 4> have a <tt>DocTypeVersion</tt> equal to or greater than 4.</t>
<t>The <tt>DocTypeReadVersion</tt> <bcp14>MUST</bcp14> contain the minimum versi on number that a reading application <t>The <tt>DocTypeReadVersion</tt> <bcp14>MUST</bcp14> contain the minimum versi on number that a reading application
can minimally support in order to play the file back -- optionally with a reduce d feature can minimally support in order to play the file back -- optionally with a reduce d feature
set. For example, if a file contains only <tt>Elements</tt> of version 2 or lowe r except for set. For example, if a file contains only <tt>Elements</tt> of version 2 or lowe r except for
<tt>CueRelativePosition</tt> (which is a version 4 Matroska <tt>Element</tt>), t hen <tt>DocTypeReadVersion</tt> <tt>CueRelativePosition</tt> (which is a version 4 Matroska Element), then <tt>D ocTypeReadVersion</tt>
<bcp14>SHOULD</bcp14> still be set to 2 and not 4 because evaluating <tt>CueRela tivePosition</tt> is not <bcp14>SHOULD</bcp14> still be set to 2 and not 4 because evaluating <tt>CueRela tivePosition</tt> is not
necessary for standard playback -- it makes seeking more precise if used.</t> necessary for standard playback -- it makes seeking more precise if used.</t>
<t>A reading application supporting Matroska version <tt>V</tt> <bcp14>MUST NOT< /bcp14> refuse to read a <t>A reading application supporting Matroska version <tt>V</tt> <bcp14>MUST NOT< /bcp14> refuse to read a
file with <tt>DocReadTypeVersion</tt> equal to or lower than <tt>V</tt> even if <tt>DocTypeVersion</tt> file with <tt>DocReadTypeVersion</tt> equal to or lower than <tt>V</tt>, even if <tt>DocTypeVersion</tt>
is greater than <tt>V</tt>.</t> is greater than <tt>V</tt>.</t>
<t>A reading application <t>A reading application
supporting at least Matroska version <tt>V</tt> reading a file whose <tt>DocType ReadVersion</tt> supporting at least Matroska version <tt>V</tt> and reading a file whose <tt>Doc TypeReadVersion</tt>
field is equal to or lower than <tt>V</tt> <bcp14>MUST</bcp14> skip Matroska/EBM L <tt>Elements</tt> it encounters field is equal to or lower than <tt>V</tt> <bcp14>MUST</bcp14> skip Matroska/EBM L <tt>Elements</tt> it encounters
but does not know about if that unknown element fits into the size constraints s et but does not know about if that unknown element fits into the size constraints s et
by the current <tt>Parent Element</tt>.</t> by the current <tt>Parent Element</tt>.</t>
</section> </section>
<section anchor="stream-copy"><name>Stream Copy</name> <section anchor="stream-copy"><name>Stream Copy</name>
<t>It is sometimes necessary to create a Matroska file from another Matroska fil e, for example to add subtitles in a language <t>It is sometimes necessary to create a Matroska file from another Matroska fil e, for example, to add subtitles in a language
or to edit out a portion of the content. or to edit out a portion of the content.
Some values from the original Matroska file need to be kept the same in the dest ination file. Some values from the original Matroska file need to be kept the same in the dest ination file.
For example, the SamplingFrequency of an audio track wouldn't change between the For example, the <tt>SamplingFrequency</tt> of an audio track wouldn't change be
two files. tween the two files.
Some other values may change between the two files, for example the TrackNumber Some other values may change between the two files, for example, the <tt>TrackNu
of an audio track when another track has been added.</t> mber</tt> of an audio track when another track has been added.</t>
<t>An Element is marked with a property: <tt>stream copy: True</tt> when the val
ues of that Element need to be kept identical between the source and destination <t>An Element is marked with a property "<tt>stream copy: True</tt>" when the va
file. lues of that Element need to be kept identical between the source and destinatio
If that property is not set, elements may or may not keep the same value between n files.
the source and destination.</t> If that property is not set, elements may or may not keep the same value between
the source and destination files.</t>
</section> </section>
<section anchor="defaultdecodedfieldduration"><name>DefaultDecodedFieldDuration< /name> <section anchor="defaultdecodedfieldduration"><name>DefaultDecodedFieldDuration< /name>
<t>The <tt>DefaultDecodedFieldDuration Element</tt> can signal to the displaying application how <t>The <tt>DefaultDecodedFieldDuration Element</tt> can signal to the displaying application how
often fields of a video sequence will be available for displaying. It can be use d for both often fields of a video sequence will be available for displaying. It can be use d for both
interlaced and progressive content.</t> interlaced and progressive content.</t>
<t>If the video sequence is signaled as interlaced <xref target="flaginterlaced- element"></xref>, then <tt>DefaultDecodedFieldDuration</tt> equals <t>If the video sequence is signaled as interlaced (<xref target="flaginterlaced -element"></xref>), then <tt>DefaultDecodedFieldDuration</tt> equals
the period between two successive fields at the output of the decoding process. the period between two successive fields at the output of the decoding process.
For video sequences signaled as progressive, <tt>DefaultDecodedFieldDuration</tt > is half of For video sequences signaled as progressive, <tt>DefaultDecodedFieldDuration</tt > is half of
the period between two successive frames at the output of the decoding process.< /t> the period between two successive frames at the output of the decoding process.< /t>
<t>These values are valid at the end of the decoding process before post-process ing <t>These values are valid at the end of the decoding process before post-process ing
(such as deinterlacing or inverse telecine) is applied.</t> (such as deinterlacing or inverse telecine) is applied.</t>
<t>Examples:</t> <t>Examples:</t>
<ul spacing="compact"> <ul>
<li>Blu-ray movie: 1000000000 ns/(48/1.001) = 20854167 ns</li> <li>Blu-ray movie: 1000000000 ns/(48/1.001) = 20854167 ns</li>
<li>PAL broadcast/DVD: 1000000000 ns/(50/1.000) = 20000000 ns</li> <li>PAL broadcast/DVD: 1000000000 ns/(50/1.000) = 20000000 ns</li>
<li>N/ATSC broadcast: 1000000000 ns/(60/1.001) = 16683333 ns</li> <li>N/ATSC broadcast: 1000000000 ns/(60/1.001) = 16683333 ns</li>
<li>hard-telecined DVD: 1000000000 ns/(60/1.001) = 16683333 ns (60 encoded inter <li>Hard-telecined DVD: 1000000000 ns/(60/1.001) = 16683333 ns (60 encoded inter
laced fields per second)</li> laced fields per second)</li>
<li>soft-telecined DVD: 1000000000 ns/(60/1.001) = 16683333 ns (48 encoded inter <li>Soft-telecined DVD: 1000000000 ns/(60/1.001) = 16683333 ns (48 encoded inter
laced fields per second, with &quot;repeat_first_field = 1&quot;)</li> laced fields per second, with "repeat_first_field = 1")</li>
</ul> </ul>
</section> </section>
<section anchor="cluster-blocks"><name>Cluster Blocks</name> <section anchor="cluster-blocks"><name>Cluster Blocks</name>
<t>Frames using references <bcp14>SHOULD</bcp14> be stored in &quot;coding order
&quot;. That means the references first, and then <t>Frames using references <bcp14>SHOULD</bcp14> be stored in "coding order" (i.
the frames referencing them. A consequence is that timestamps might not be conse e., the references first and then
cutive. the frames referencing them). A consequence is that timestamps might not be cons
But a frame with a past timestamp <bcp14>MUST</bcp14> reference a frame already ecutive.
known, otherwise it's considered bad/void.</t> However, a frame with a past timestamp <bcp14>MUST</bcp14> reference a frame alr
eady known; otherwise, it is considered bad/void.</t>
<t>Matroska has two similar ways to store frames in a block:</t> <t>Matroska has two similar ways to store frames in a block:</t>
<ul spacing="compact"> <ul>
<li>in a <tt>Block</tt> which is contained inside a <tt>BlockGroup</tt>,</li> <li>in a <tt>Block</tt> that is contained inside a <tt>BlockGroup</tt></li>
<li>or in a <tt>SimpleBlock</tt> which is directly in the <tt>Cluster</tt>.</li> <li>in a <tt>SimpleBlock</tt> that is directly in the <tt>Cluster</tt></li>
</ul> </ul>
<t>The <tt>SimpleBlock</tt> is usually preferred unless some extra elements of t he <tt>BlockGroup</tt> need to be used. <t>The <tt>SimpleBlock</tt> is usually preferred unless some extra elements of t he <tt>BlockGroup</tt> need to be used.
A Matroska Reader <bcp14>MUST</bcp14> support both types of blocks.</t> A Matroska Reader <bcp14>MUST</bcp14> support both types of blocks.</t>
<t>Each block contains the same parts in the following order:</t> <t>Each block contains the same parts in the following order:</t>
<ul spacing="compact"> <ul>
<li>a variable length header,</li> <li>a variable-length header</li>
<li>optionally the lacing information,</li> <li>the lacing information (optional)</li>
<li>the consecutive frame(s)</li> <li>the consecutive frame(s)</li>
</ul> </ul>
<t>The block header starts with the number of the Track it corresponds to.
The value <bcp14>MUST</bcp14> corresponding to the <tt>TrackNumber</tt> (<xref t <t>The block header starts with the number of the <tt>Track</tt> it corresponds
arget="tracknumber-element"></xref>) of a <tt>TrackEntry</tt> of the <tt>Segment to.
</tt>.</t>
<t>The <tt>TrackNumber</tt> is coded using the VINT mechanism described in Secti The value <bcp14>MUST</bcp14> correspond to the <tt>TrackNumber</tt> (<xref targ
on 4 of <xref target="RFC8794"></xref>. et="tracknumber-element"></xref>) of a <tt>TrackEntry</tt> of the <tt>Segment</t
To save space, the shortest VINT form <bcp14>SHOULD</bcp14> be used. The value c t>.</t>
an be coded on up to 8 octets. <t>The <tt>TrackNumber</tt> is coded using the Variable-Size Integer (VINT) mech
anism described in <xref target="RFC8794" sectionFormat="of" section="4"></xref>
.
To save space, the shortest VINT form <bcp14>SHOULD</bcp14> be used. The value c
an be coded using up to 8 octets.
This is the only element with a variable size in the block header.</t> This is the only element with a variable size in the block header.</t>
<t>The timestamp is expressed in Track Ticks; see <xref target="timestamp-ticks" ></xref>. <t>The timestamp is expressed in Track Ticks; see <xref target="timestamp-ticks" ></xref>.
The value is stored as a signed value on 16 bits.</t> The value is stored as a signed value on 16 bits.</t>
<section anchor="block-structure"><name>Block Structure</name> <section anchor="block-structure"><name>Block Structure</name>
<t>This section describes the binary data contained in the <tt>Block</tt> Elemen t <xref target="block-element"></xref>. Bit 0 is the most significant bit.</t> <t>This section describes the binary data contained in the <tt>Block</tt> Elemen t (<xref target="block-element"></xref>). Bit 0 is the most significant bit.</t>
<t>As the <tt>TrackNumber</tt> size can vary between 1 and 8 octets, there are 8 different sizes for the <tt>Block</tt> header. <t>As the <tt>TrackNumber</tt> size can vary between 1 and 8 octets, there are 8 different sizes for the <tt>Block</tt> header.
We only provide the definitions for <tt>TrackNumber</tt> sizes of 1 and 2. The definitions for <tt>TrackNumber</tt> sizes of 1 and 2 are provided; the othe
The other variants can be deduced by extending the size of the <tt>TrackNumber</ r variants can be deduced by extending the size of the <tt>TrackNumber</tt> by m
tt> by multiples of 8 bits.</t> ultiples of 8 bits.</t>
<figure><name>Block Header with 1 octet TrackNumber <figure><name>Block Header with 1-Octet TrackNumber
</name> </name>
<artwork> 0 1 2 3 <artwork>
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
| | | |I|LAC|U| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Track Number | Timestamp | Rsvrd |N|ING|N| | | | |I|LAC|U|
| | | |V| |U| | Track Number | Timestamp | Rsvrd |N|ING|N|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | |V| |U|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</artwork> </artwork>
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</figure> </figure>
<figure><name>Block Header with 2 octets TrackNumber <figure><name>Block Header with 2-Octet TrackNumber
</name> </name>
<artwork> 0 1 2 3 <artwork>
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
| Track Number | Timestamp | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Track Number | Timestamp |
| |I|LAC|U| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Rsvrd |N|ING|N| ... | |I|LAC|U|
| |V| |U| | Rsvrd |N|ING|N| ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |V| |U|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</artwork> </artwork>
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</figure> </figure>
<t>where:</t> <t>where:</t>
<dl newline="false" spacing="normal">
<dt>Track Number:</dt><dd>8, 16, 24, 32, 40, 48, or 64 bits. An EBML VINT-coded
track number.</dd>
<dt>Timestamp:</dt><dd>16 bits. Signed timestamp in Track Ticks.</dd>
<dt>Rsvrd:</dt><dd>4 bits. Reserved bits <bcp14>MUST</bcp14> be set to 0.</dd>
<dt>INV:</dt><dd>1 bit. Invisible. The codec <bcp14>SHOULD</bcp14> decode this f
rame but not display it.</dd>
<dt>LACING:</dt><dd><t>2 bits. Uses lacing mode.</t>
<dl newline="true" spacing="normal"> <dl spacing="compact">
<dt>Track Number: 8, 16, 24, 32, 40, 48 or 64 bits</dt> <dt>00b:</dt><dd>no lacing (<xref target="no-lacing"></xref>)</dd>
<dd>an EBML VINT coded track number</dd> <dt>01b:</dt><dd>Xiph lacing (<xref target="xiph-lacing"></xref>)</dd>
<dt>Timestamp: 16 bits</dt> <dt>11b:</dt><dd>EBML lacing (<xref target="ebml-lacing"></xref>)</dd>
<dd>signed timestamp in Track Ticks</dd> <dt>10b:</dt><dd>fixed-size lacing (<xref target="fixed-size-lacing"></xref>)</d
<dt>Rsvrd: 4 bits</dt> d>
<dd>Reserved bits <bcp14>MUST</bcp14> be set to 0</dd> </dl></dd>
<dt>INV: 1 bit</dt> <dt>UNU:</dt><dd>1 bit. Unused bit.</dd>
<dd>Invisible, the codec <bcp14>SHOULD</bcp14> decode this frame but not display
it</dd>
<dt>LACING: 2 bits</dt>
<dd><t>using lacing mode</t>
<ul spacing="compact">
<li>00b : no lacing (<xref target="no-lacing"></xref>)</li>
<li>01b : Xiph lacing (<xref target="xiph-lacing"></xref>)</li>
<li>11b : EBML lacing (<xref target="ebml-lacing"></xref>)</li>
<li>10b : fixed-size lacing (<xref target="fixed-size-lacing"></xref>)</li>
</ul></dd>
<dt>UNU: 1 bit</dt>
<dd>unused bit</dd>
</dl> </dl>
<t>The following data in the <tt>Block</tt> correspond to the lacing data and fr
ames usage as described in each respective lacing mode.</t> <t>The remaining data in the <tt>Block</tt> corresponds to the lacing data and f
rames usage as described in each respective lacing mode (see <xref target="block
-lacing"/>).</t>
</section> </section>
<section anchor="simpleblock-structure"><name>SimpleBlock Structure</name> <section anchor="simpleblock-structure"><name>SimpleBlock Structure</name>
<t>This section describes the binary data contained in the <tt>SimpleBlock</tt> <t>This section describes the binary data contained in the <tt>SimpleBlock</tt>
Element <xref target="simpleblock-element"></xref>. Bit 0 is the most significan Element (<xref target="simpleblock-element"></xref>). Bit 0 is the most signific
t bit.</t> ant bit.</t>
<t>The <tt>SimpleBlock</tt> is inspired by the Block structure; see <xref target <t>The <tt>SimpleBlock</tt> structure is inspired by the <tt>Block</tt> structur
="block-structure"></xref>. e; see <xref target="block-structure"></xref>.
The main differences are the added Keyframe flag and Discardable flag. Otherwise , everything is the same.</t> The main differences are the added Keyframe flag and Discardable flag. Otherwise , everything is the same.</t>
<t>As the <tt>TrackNumber</tt> size can vary between 1 and 8 octets, there are 8 different sizes for the <tt>SimpleBlock</tt> header. <t>As the <tt>TrackNumber</tt> size can vary between 1 and 8 octets, there are 8 different sizes for the <tt>SimpleBlock</tt> header.
We only provide the definitions for <tt>TrackNumber</tt> sizes of 1 and 2. The definitions for <tt>TrackNumber</tt> sizes of 1 and 2 are provided; the
The other variants can be deduced by extending the size of the <tt>TrackNumber</ other variants can be deduced by extending the size of the
tt> by multiples of 8 bits.</t> <tt>TrackNumber</tt> by multiples of 8 bits.</t>
<figure><name>SimpleBlock Header with 1 octet TrackNumber <figure><name>SimpleBlock Header with 1-Octet TrackNumber
</name> </name>
<artwork> 0 1 2 3 <artwork>
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
| | |K| |I|LAC|D| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Track Number | Timestamp |E|Rsvrd|N|ING|I| | | |K| |I|LAC|D|
| | |Y| |V| |S| | Track Number | Timestamp |E|Rsvrd|N|ING|I|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | |Y| |V| |S|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</artwork> </artwork>
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</figure> </figure>
<figure><name>SimpleBlock Header with 2 octets TrackNumber <figure><name>SimpleBlock Header with 2-Octet TrackNumber
</name> </name>
<artwork> 0 1 2 3 <artwork>
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
| Track Number | Timestamp | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Track Number | Timestamp |
|K| |I|LAC|D| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|E|Rsvrd|N|ING|I| ... |K| |I|LAC|D|
|Y| |V| |S| |E|Rsvrd|N|ING|I| ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Y| |V| |S|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</artwork> </artwork>
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</figure> </figure>
<t>where:</t> <t>where:</t>
<dl newline="true" spacing="normal"> <dl newline="false" spacing="normal">
<dt>Track Number: 8, 16, 24, 32, 40, 48 or 64 bits</dt> <dt>Track Number:</dt><dd>8, 16, 24, 32, 40, 48, or 64 bits. An EBML VINT-coded
<dd>an EBML VINT coded track number</dd> track number.</dd>
<dt>Timestamp: 16 bits</dt> <dt>Timestamp:</dt><dd>16 bits. Signed timestamp in Track Ticks.</dd>
<dd>signed timestamp in Track Ticks</dd> <dt>KEY:</dt><dd>1 bit. Keyframe. Set when the <tt>Block</tt> contains only keyf
<dt>KEY: 1 bit</dt> rames.</dd>
<dd>Keyframe, set when the Block contains only keyframes</dd> <dt>Rsvrd:</dt><dd>3 bits. Reserved bits <bcp14>MUST</bcp14> be set to 0.</dd>
<dt>Rsvrd: 3 bits</dt> <dt>INV:</dt><dd>1 bit. Invisible. The codec <bcp14>SHOULD</bcp14> decode this f
<dd>Reserved bits <bcp14>MUST</bcp14> be set to 0</dd> rame but not display it.</dd>
<dt>INV: 1 bit</dt> <dt>LACING:</dt><dd><t>2 bits. Uses lacing mode.</t>
<dd>Invisible, the codec <bcp14>SHOULD</bcp14> decode this frame but not display
it</dd>
<dt>LACING: 2 bits</dt>
<dd><t>using lacing mode</t>
<ul spacing="compact"> <dl spacing="compact">
<li>00b : no lacing (<xref target="no-lacing"></xref>)</li> <dt>00b:</dt><dd>no lacing (<xref target="no-lacing"></xref>)</dd>
<li>01b : Xiph lacing (<xref target="xiph-lacing"></xref>)</li> <dt>01b:</dt><dd>Xiph lacing (<xref target="xiph-lacing"></xref>)</dd>
<li>11b : EBML lacing (<xref target="ebml-lacing"></xref>)</li> <dt>11b:</dt><dd>EBML lacing (<xref target="ebml-lacing"></xref>)</dd>
<li>10b : fixed-size lacing (<xref target="fixed-size-lacing"></xref>)</li> <dt>10b:</dt><dd>fixed-size lacing (<xref target="fixed-size-lacing"></xref>)</d
</ul></dd> d>
<dt>DIS: 1 bit</dt> </dl></dd>
<dd>Discardable, the frames of the Block can be discarded during playing if need <dt>DIS:</dt><dd>1 bit. Discardable. The frames of the <tt>Block</tt> can be dis
ed</dd> carded during playing if needed.</dd>
</dl> </dl>
<t>The following data in the <tt>SimpleBlock</tt> correspond to the lacing data and frames usage as described in each respective lacing mode.</t> <t>The remaining data in the <tt>SimpleBlock</tt> corresponds to the lacing data and frames usage as described in each respective lacing mode (see <xref target= "block-lacing"/>).</t>
</section> </section>
<section anchor="block-lacing"><name>Block Lacing</name> <section anchor="block-lacing"><name>Block Lacing</name>
<t>Lacing is a mechanism to save space when storing data. It is typically used f or small blocks <t>Lacing is a mechanism to save space when storing data. It is typically used f or small blocks
of data (referred to as frames in Matroska). It packs multiple frames into a sin gle <tt>Block</tt> or <tt>SimpleBlock</tt>.</t> of data (referred to as frames in Matroska). It packs multiple frames into a sin gle <tt>Block</tt> or <tt>SimpleBlock</tt>.</t>
<t>Lacing <bcp14>MUST NOT</bcp14> be used to store a single frame in a <tt>Block </tt> or <tt>SimpleBlock</tt>.</t> <t>Lacing <bcp14>MUST NOT</bcp14> be used to store a single frame in a <tt>Block </tt> or <tt>SimpleBlock</tt>.</t>
<t>There are 3 types of lacing:</t> <t>There are three types of lacing:</t>
<ol spacing="compact"> <ul>
<li>Xiph, inspired by what is found in the Ogg container <xref target="RFC3533"> <li>Xiph, which is inspired by what is found in the Ogg container <xref target="
</xref></li> RFC3533"></xref></li>
<li>EBML, which is the same with sizes coded differently</li> <li>EBML, which is the same with sizes coded differently</li>
<li>fixed-size, where the size is not coded</li> <li>Fixed-size, where the size is not coded</li>
</ol> </ul>
<t>When lacing is not used, i.e. to store a single frame, the lacing bits 5 and
6 of the <tt>Block</tt> or <tt>SimpleBlock</tt> <bcp14>MUST</bcp14> be set to ze <t>When lacing is not used, i.e., to store a single frame, the lacing bits (bits
ro.</t> 6 and 7) of the <tt>Block</tt> or <tt>SimpleBlock</tt> <bcp14>MUST</bcp14> be s
<t>For example, a user wants to store 3 frames of the same track. The first fram et to zero.</t>
e is 800 octets long, <t>For example, a user wants to store three frames of the same track. The first
the second is 500 octets long and the third is 1000 octets long. As these data a frame is 800 octets long,
re small, the second is 500 octets long, and the third is 1000 octets long.
Because these frames are small,
they can be stored in a lace to save space.</t> they can be stored in a lace to save space.</t>
<t>It is possible not to use lacing at all and just store a single frame without <t>It is possible to not use lacing at all and just store a single frame without
any extra data. any extra data.
When the FlagLacing -- <xref target="flaglacing-element"></xref> -- is set to &q When the <tt>FlagLacing</tt> (<xref target="flaglacing-element"></xref>) is set
uot;0&quot; all blocks of that track <bcp14>MUST NOT</bcp14> use lacing.</t> to 0, all blocks of that track <bcp14>MUST NOT</bcp14> use lacing.</t>
<section anchor="no-lacing"><name>No lacing</name> <section anchor="no-lacing"><name>No Lacing</name>
<t>When no lacing is used, the number of frames in the lace is ommitted and only <t>When no lacing is used, the number of frames in the lace is ommitted, and onl
one frame can be stored in the Block. y one frame can be stored in the Block. The LACING bits of the <tt>Block</tt> He
The bits 5-6 of the Block Header flags are set to <tt>0b00</tt>.</t> ader flags are set to <tt>00b</tt>.</t>
<t>The Block for an 800 octets frame is as follows:</t> <t>The <tt>Block</tt> for an 800-octet frame is as follows:</t>
<table anchor="blockNoLacing"><name>No lacing</name> <table anchor="blockNoLacing"><name>No Lacing</name>
<thead> <thead>
<tr> <tr>
<th align="left">Block Octets</th> <th align="left">Block Octet</th>
<th align="left">Value</th> <th align="left">Value</th>
<th align="left">Description</th> <th align="left">Description</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">4-803</td> <td align="left">4-803</td>
<td align="left">&lt;frame&gt;</td> <td align="left">&lt;frame&gt;</td>
<td align="left">Single frame data</td> <td align="left">Single frame data</td>
</tr> </tr>
</tbody> </tbody>
</table><t>When a Block contains a single frame, it <bcp14>MUST</bcp14> use this </table>
No lacing mode.</t>
<t>When a <tt>Block</tt> contains a single frame, it <bcp14>MUST</bcp14> use thi
s "no lacing" mode.</t>
</section> </section>
<section anchor="xiph-lacing"><name>Xiph lacing</name> <section anchor="xiph-lacing"><name>Xiph Lacing</name>
<t>The Xiph lacing uses the same coding of size as found in the Ogg container <x ref target="RFC3533"></xref>. <t>The Xiph lacing uses the same coding of size as found in the Ogg container <x ref target="RFC3533"></xref>.
The bits 5-6 of the Block Header flags are set to <tt>0b01</tt>.</t> The LACING bits of the <tt>Block</tt> Header flags are set to <tt>01b</tt>.</t>
<t>The Block data with laced frames is stored as follows:</t> <t>The <tt>Block</tt> data with laced frames is stored as follows:</t>
<ul spacing="compact"> <ul>
<li>Lacing Head on 1 Octet: Number of frames in the lace minus 1.</li> <li>Lacing Head on 1 octet: Number of frames in the lace minus 1.</li>
<li>Lacing size of each frame except the last one.</li> <li>Lacing size of each frame except the last one.</li>
<li>Binary data of each frame consecutively.</li> <li>Binary data of each frame consecutively.</li>
</ul> </ul>
<t>The lacing size is split into 255 values, stored as unsigned octets -- for ex ample, 500 is coded 255;245 or [0xFF 0xF5]. <t>The lacing size is split into 255 values, stored as unsigned octets -- for ex ample, 500 is coded 255;245 or [0xFF 0xF5].
A frame with a size multiple of 255 is coded with a 0 at the end of the size -- for example, 765 is coded 255;255;255;0 or [0xFF 0xFF 0xFF 0x00].</t> A frame with a size multiple of 255 is coded with a 0 at the end of the size -- for example, 765 is coded 255;255;255;0 or [0xFF 0xFF 0xFF 0x00].</t>
<t>The size of the last frame is deduced from the size remaining in the Block af ter the other frames.</t> <t>The size of the last frame is deduced from the size remaining in the <tt>Bloc k</tt> after the other frames.</t>
<t>Because large sizes result in large coding of the sizes, it is <bcp14>RECOMME NDED</bcp14> to use Xiph lacing only with small frames.</t> <t>Because large sizes result in large coding of the sizes, it is <bcp14>RECOMME NDED</bcp14> to use Xiph lacing only with small frames.</t>
<t>In our example, the 800, 500 and 1000 frames are stored with Xiph lacing in a <t>In our example, the 800-, 500-, and 1000-octet frames are stored with Xiph la
Block as follows:</t> cing in a <tt>Block</tt> as follows:</t>
<table anchor="blockXiphLacing"><name>Xiph lacing example</name> <table anchor="blockXiphLacing"><name>Xiph Lacing Example</name>
<thead> <thead>
<tr> <tr>
<th align="left">Block Octet</th> <th align="left">Block Octets</th>
<th align="left">Value</th> <th align="left">Value</th>
<th align="left">Description</th> <th align="left">Description</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">4</td> <td align="left">4</td>
<td align="left">0x02</td> <td align="left">0x02</td>
<td align="left">Number of frames minus 1</td> <td align="left">Number of frames minus 1</td>
skipping to change at line 5605 skipping to change at line 5812
<td align="left"></td> <td align="left"></td>
<td align="left">Second frame data</td> <td align="left">Second frame data</td>
</tr> </tr>
<tr> <tr>
<td align="left">1311-2310</td> <td align="left">1311-2310</td>
<td align="left"></td> <td align="left"></td>
<td align="left">Third frame data</td> <td align="left">Third frame data</td>
</tr> </tr>
</tbody> </tbody>
</table><t>The Block is 2311 octets large and the last frame starts at 1311, so we can deduce the size of the last frame is 2311 - 1311 = 1000.</t> </table><t>The Block is 2311 octets, and the last frame starts at 1311, so we ca n deduce that the size of the last frame is 2311 - 1311 = 1000.</t>
</section> </section>
<section anchor="ebml-lacing"><name>EBML lacing</name> <section anchor="ebml-lacing"><name>EBML Lacing</name>
<t>The EBML lacing encodes the frame size with an EBML-like encoding <xref targe t="RFC8794"></xref>. <t>The EBML lacing encodes the frame size with an EBML-like encoding <xref targe t="RFC8794"></xref>.
The bits 5-6 of the Block Header flags are set to <tt>0b11</tt>.</t> The LACING bits of the <tt>Block</tt> Header flags are set to <tt>11b</tt>.</t>
<t>The Block data with laced frames is stored as follows:</t> <t>The <tt>Block</tt> data with laced frames is stored as follows:</t>
<ul>
<ul spacing="compact">
<li>Lacing Head on 1 Octet: Number of frames in the lace minus 1.</li> <li>Lacing Head on 1 Octet: Number of frames in the lace minus 1.</li>
<li>Lacing size of each frame except the last one.</li> <li>Lacing size of each frame except the last one.</li>
<li>Binary data of each frame consecutively.</li> <li>Binary data of each frame consecutively.</li>
</ul> </ul>
<t>The first frame size is encoded as an EBML Variable-Size Integer value, also known as VINT in <xref target="RFC8794"></xref>. <t>The first frame size is encoded as an EBML VINT value.
The remaining frame sizes are encoded as signed values using the difference betw een the frame size and the previous frame size. The remaining frame sizes are encoded as signed values using the difference betw een the frame size and the previous frame size.
These signed values are encoded as VINT, with a mapping from signed to unsigned numbers. These signed values are encoded as VINT, with a mapping from signed to unsigned numbers.
Decoding the unsigned number stored in the VINT to a signed number is done by su btracting 2<sup>((7*n)-1)</sup>-1, where <tt>n</tt> is the octet size of the VIN T.</t> Decoding the unsigned number stored in the VINT to a signed number is done by su btracting 2<sup>((7*n)-1)</sup>-1, where <tt>n</tt> is the octet size of the VIN T.</t>
<table anchor="ebmlLacingBits"><name>EBML Lacing signed VINT bits usage</name> <table anchor="ebmlLacingBits"><name>EBML Lacing Signed VINT Bits Usage</name>
<thead> <thead>
<tr> <tr>
<th align="left">Bit Representation of signed VINT</th> <th align="left">Bit Representation of Signed VINT</th>
<th align="left">Possible Value Range</th> <th align="left">Possible Value Range</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">1xxx xxxx</td> <td align="left">1xxx xxxx</td>
<td align="left">2^7 values from -(2<sup>6</sup>-1) to 2<sup>6</sup></td> <td align="left">2^7 values from -(2<sup>6</sup>-1) to 2<sup>6</sup></td>
</tr> </tr>
skipping to change at line 5656 skipping to change at line 5864
<tr> <tr>
<td align="left">0001 xxxx xxxx xxxx xxxx xxxx xxxx xxxx</td> <td align="left">0001 xxxx xxxx xxxx xxxx xxxx xxxx xxxx</td>
<td align="left">2^28 values from -(2<sup>27</sup>-1) to 2<sup>27</sup></td> <td align="left">2^28 values from -(2<sup>27</sup>-1) to 2<sup>27</sup></td>
</tr> </tr>
<tr> <tr>
<td align="left">0000 1xxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx</td> <td align="left">0000 1xxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx</td>
<td align="left">2^35 values from -(2<sup>34</sup>-1) to 2<sup>34</sup></td> <td align="left">2^35 values from -(2<sup>34</sup>-1) to 2<sup>34</sup></td>
</tr> </tr>
</tbody> </tbody>
</table><t>In our example, the 800, 500 and 1000 frames are stored with EBML lac </table><t>In our example, the 800-, 500-, and 1000-octet frames are stored with
ing in a Block as follows:</t> EBML lacing in a <tt>Block</tt> as follows:</t>
<table anchor="blockEbmlLacing"><name>EBML lacing example</name>
<table anchor="blockEbmlLacing"><name>EBML Lacing Example</name>
<thead> <thead>
<tr> <tr>
<th align="left">Block Octets</th> <th align="left">Block Octets</th>
<th align="left">Value</th> <th align="left">Value</th>
<th align="left">Description</th> <th align="left">Description</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 5703 skipping to change at line 5912
<td align="left">&lt;frame2&gt;</td> <td align="left">&lt;frame2&gt;</td>
<td align="left">Second frame data</td> <td align="left">Second frame data</td>
</tr> </tr>
<tr> <tr>
<td align="left">1308-2307</td> <td align="left">1308-2307</td>
<td align="left">&lt;frame3&gt;</td> <td align="left">&lt;frame3&gt;</td>
<td align="left">Third frame data</td> <td align="left">Third frame data</td>
</tr> </tr>
</tbody> </tbody>
</table><t>The Block is 2308 octets large and the last frame starts at 1308, so we can deduce the size of the last frame is 2308 - 1308 = 1000.</t> </table><t>The Block is 2308 octets, and the last frame starts at 1308, so we ca n deduce that the size of the last frame is 2308 - 1308 = 1000.</t>
</section> </section>
<section anchor="fixed-size-lacing"><name>Fixed-size lacing</name> <section anchor="fixed-size-lacing"><name>Fixed-size Lacing</name>
<t>The Fixed-size lacing doesn't store the frame size, only the number of frames <t>Fixed-size lacing doesn't store the frame size; rather, it only stores the nu
in the lace. mber of frames in the lace.
Each frame <bcp14>MUST</bcp14> have the same size. The frame size of each frame is deduced from the total size of the Block. Each frame <bcp14>MUST</bcp14> have the same size. The frame size of each frame is deduced from the total size of the Block.
The bits 5-6 of the Block Header flags are set to <tt>0b10</tt>.</t> The LACING bits of the <tt>Block</tt> Header flags are set to <tt>10b</tt>.</t>
<t>The Block data with laced frames is stored as follows:</t> <t>The <tt>Block</tt> data with laced frames is stored as follows:</t>
<ul spacing="compact"> <ul>
<li>Lacing Head on 1 Octet: Number of frames in the lace minus 1.</li> <li>Lacing Head on 1 Octet: Number of frames in the lace minus 1.</li>
<li>Binary data of each frame consecutively.</li> <li>Binary data of each frame consecutively.</li>
</ul> </ul>
<t>For example, for 3 frames of 800 octets each:</t> <t>For example, for three frames that are 800 octets each:</t>
<table anchor="blockFixedSizeLacing"><name>Fixed-size lacing example</name> <table anchor="blockFixedSizeLacing"><name>Fixed-Size Lacing Example</name>
<thead> <thead>
<tr> <tr>
<th align="left">Block Octets</th> <th align="left">Block Octets</th>
<th align="left">Value</th> <th align="left">Value</th>
<th align="left">Description</th> <th align="left">Description</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 5751 skipping to change at line 5960
<td align="left">&lt;frame2&gt;</td> <td align="left">&lt;frame2&gt;</td>
<td align="left">Second frame data</td> <td align="left">Second frame data</td>
</tr> </tr>
<tr> <tr>
<td align="left">1605-2404</td> <td align="left">1605-2404</td>
<td align="left">&lt;frame3&gt;</td> <td align="left">&lt;frame3&gt;</td>
<td align="left">Third frame data</td> <td align="left">Third frame data</td>
</tr> </tr>
</tbody> </tbody>
</table><t>This gives a Block of 2405 octets. When reading the Block we find tha t there are 3 frames (Octet 4). </table><t>This gives a Block of 2405 octets. When reading the Block, we find th at there are three frames (Octet 4).
The data start at Octet 5, so the size of each frame is (2405 - 5) / 3 = 800.</t > The data start at Octet 5, so the size of each frame is (2405 - 5) / 3 = 800.</t >
</section> </section>
<section anchor="laced-frames-timestamp"><name>Laced Frames Timestamp</name> <section anchor="laced-frames-timestamp"><name>Laced Frames Timestamp</name>
<t>A Block only contains a single timestamp value. But when lacing is used, it c ontains more than one frame. <t>A <tt>Block</tt> only contains a single timestamp value. But when lacing is u sed, it contains more than one frame.
Each frame originally has its own timestamp, or Presentation Timestamp (PTS). Th at timestamp applies to Each frame originally has its own timestamp, or Presentation Timestamp (PTS). Th at timestamp applies to
the first frame in the lace.</t> the first frame in the lace.</t>
<t>In the lace, each frame after the first one has an underdetermined timestamp. <t>In the lace, each frame after the first one has an underdetermined timestamp.
But each of these frames <bcp14>MUST</bcp14> be contiguous -- i.e. the decoded d However, each of these frames <bcp14>MUST</bcp14> be contiguous -- i.e., the dec
ata <bcp14>MUST NOT</bcp14> contain any gap oded data <bcp14>MUST NOT</bcp14> contain any gap
between them. If there is a gap in the stream, the frames around the gap <bcp14> between them. If there is a gap in the stream, the frames around the gap <bcp14>
MUST NOT</bcp14> be in the same Block.</t> MUST NOT</bcp14> be in the same <tt>Block</tt>.</t>
<t>Lacing is only useful for small contiguous data to save space. This is usuall y the case for audio tracks <t>Lacing is only useful for small contiguous data to save space. This is usuall y the case for audio tracks
and not the case for video -- which use a lot of data -- or subtitle tracks -- w and not the case for video (which use a lot of data) or subtitle tracks (which h
hich have long gaps. ave long gaps).
For audio, there is usually a fixed output sampling frequency for the whole trac For audio, there is usually a fixed output sampling frequency for the whole trac
k. k,
So the decoder should be able to recover the timestamp of each sample, knowing e so the decoder should be able to recover the timestamp of each sample, knowing e
ach ach
output sample is contiguous with a fixed frequency. output sample is contiguous with a fixed frequency.
For subtitles this is usually not the case so lacing <bcp14>SHOULD NOT</bcp14> b e used.</t> For subtitles, this is usually not the case, so lacing <bcp14>SHOULD NOT</bcp14> be used.</t>
</section> </section>
</section> </section>
<section anchor="random-access-points"><name>Random Access Points</name> <section anchor="random-access-points"><name>Random Access Points</name>
<t>Random Access Points (RAP) are positions where the parser can seek to and sta
rt playback without decoding <t>Random Access Points (RAPs) are positions where the parser can seek to and
of what was before. In Matroska <tt>BlockGroups</tt> and <tt>SimpleBlocks</tt> c start playback without decoding what was before. In Matroska,
an be RAPs. <tt>BlockGroups</tt> and <tt>SimpleBlocks</tt> can be RAPs. To seek to these
To seek to these elements it is still necessary to seek to the <tt>Cluster</tt> elements, it is still necessary to seek to the <tt>Cluster</tt> containing
containing them, them, read the <tt>Cluster</tt> Timestamp, and start playback from the
read the Cluster Timestamp <tt>BlockGroup</tt> or <tt>SimpleBlock</tt> that is a RAP.</t>
and start playback from the <tt>BlockGroup</tt> or <tt>SimpleBlock</tt> that is
a RAP.</t>
<t>Because a Matroska File is usually composed of multiple tracks playing at the same time <t>Because a Matroska File is usually composed of multiple tracks playing at the same time
taken in account. Usually all audio and subtitle <tt>BlockGroup</tt> or <tt>Simp -- video, audio, and subtitles -- to seek properly to a RAP, each selected track
leBlock</tt> are RAP. must be
taken into account. Usually, all audio and subtitle <tt>BlockGroups</tt> or <tt>
SimpleBlocks</tt> are RAPs.
They are independent of each other and can be played randomly.</t> They are independent of each other and can be played randomly.</t>
<t>Video tracks on the other hand often use references to previous and future fr <t>On the other hand, video tracks often use references to previous and future f
ames for better rames for better
coding efficiency. Frames with such reference <bcp14>MUST</bcp14> either contain coding efficiency. Frames with such references <bcp14>MUST</bcp14> either contai
one or more n one or more
<tt>ReferenceBlock</tt> Elements in their <tt>BlockGroup</tt> or <bcp14>MUST</bc p14> be marked <tt>ReferenceBlock</tt> Elements in their <tt>BlockGroup</tt> or <bcp14>MUST</bc p14> be marked
as non-keyframe in a <tt>SimpleBlock</tt>; see <xref target="simpleblock-structu re"></xref>.</t> as non-keyframe in a <tt>SimpleBlock</tt>; see <xref target="simpleblock-structu re"></xref>.</t>
<ul spacing="compact"> <figure><name>BlockGroup with a Frame That References Another Frame, with the EB
<li>BlockGroup with a frame that references another frame, with the EBML tree sh ML Tree Shown as XML</name>
own as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- References a Block 40 Track Ticks before this one --&gt; &lt;!-- References a Block 40 Track Ticks before this one --&gt;
&lt;ReferenceBlock&gt;-40&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;-40&lt;/ReferenceBlock&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
</figure>
<ul spacing="compact"> <figure><name>SimpleBlock with a Frame That References Another Frame, with the E
<li>SimpleBlock with a frame that references another frame, with the EBML tree s BML Tree Shown as XML</name>
hown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;SimpleBlock/&gt; (octet 3 bit 0 not set) &lt;SimpleBlock/&gt; (octet 3 bit 0 not set)
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
<t>Frames that are RAP -- i.e. they don't depend on other frames -- <bcp14>MUST< </figure>
/bcp14> set the keyframe <t>Frames that are RAPs (i.e., frames that don't depend on other frames) <bcp14>
MUST</bcp14> set the keyframe
flag if they are in a <tt>SimpleBlock</tt> or their parent <tt>BlockGroup</tt> < bcp14>MUST NOT</bcp14> contain flag if they are in a <tt>SimpleBlock</tt> or their parent <tt>BlockGroup</tt> < bcp14>MUST NOT</bcp14> contain
a <tt>ReferenceBlock</tt>.</t> a <tt>ReferenceBlock</tt>.</t>
<ul spacing="compact"> <figure><name>BlockGroup with a Frame That References No Other Frame, with the E
<li>BlockGroup with a frame that references no other frame, with the EBML tree s BML Tree Shown as XML</name>
hown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- No ReferenceBlock allowed in this BlockGroup --&gt; &lt;!-- No ReferenceBlock allowed in this BlockGroup --&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
</figure>
<ul spacing="compact"> <figure><name>SimpleBlock with a Frame That References No Other Frame, with the
<li>SimpleBlock with a frame that references no other frame, with the EBML tree EBML Tree Shown as XML</name>
shown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;SimpleBlock/&gt; (octet 3 bit 0 set) &lt;SimpleBlock/&gt; (octet 3 bit 0 set)
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
</figure>
<t>There may be cases where the use of <tt>BlockGroup</tt> is necessary, as the frame may need a <t>There may be cases where the use of <tt>BlockGroup</tt> is necessary, as the frame may need a
<tt>BlockDuration</tt>, <tt>BlockAdditions</tt>, <tt>CodecState</tt> or a <tt>Di <tt>BlockDuration</tt>, <tt>BlockAdditions</tt>, <tt>CodecState</tt>, or <tt>Dis
scardPadding</tt> element. cardPadding</tt> element.
For thoses cases a <tt>SimpleBlock</tt> <bcp14>MUST NOT</bcp14> be used, For thoses cases, a <tt>SimpleBlock</tt> <bcp14>MUST NOT</bcp14> be used;
the reference information <bcp14>SHOULD</bcp14> be recovered for non-RAP frames. </t> the reference information <bcp14>SHOULD</bcp14> be recovered for non-RAP frames. </t>
<ul spacing="compact"> <figure><name>SimpleBlock with a Frame That References Another Frame, with the E
<li>SimpleBlock with a frame that references another frame, with the EBML tree s BML Tree Shown as XML</name>
hown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;SimpleBlock/&gt; (octet 3 bit 0 not set) &lt;SimpleBlock/&gt; (octet 3 bit 0 not set)
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
</figure>
<ul spacing="compact"> <figure><name>Same Frame That References Another Frame Put inside a <tt>BlockGro
<li>Same frame that references another frame put inside a BlockGroup to add <tt> up</tt> to Add <tt>BlockDuration</tt>, with the EBML Tree Shown as XML</name>
BlockDuration</tt>, with the EBML tree shown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- ReferenceBlock value recovered based on the codec --&gt; &lt;!-- ReferenceBlock value recovered based on the codec --&gt;
&lt;ReferenceBlock&gt;-40&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;-40&lt;/ReferenceBlock&gt;
&lt;BlockDuration&gt;20&lt;BlockDuration&gt; &lt;BlockDuration&gt;20&lt;/BlockDuration&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
</figure>
<t>When a frame in a <tt>BlockGroup</tt> is not a RAP, the <tt>BlockGroup</tt> < bcp14>MUST</bcp14> contain at least a <tt>ReferenceBlock</tt>. <t>When a frame in a <tt>BlockGroup</tt> is not a RAP, the <tt>BlockGroup</tt> < bcp14>MUST</bcp14> contain at least a <tt>ReferenceBlock</tt>.
The <tt>ReferenceBlock</tt>s <bcp14>MUST</bcp14> be used in one of the following ways:</t> The <tt>ReferenceBlock</tt>s <bcp14>MUST</bcp14> be used in one of the following ways:</t>
<ul spacing="compact"> <ul>
<li>each reference frame listed as a <tt>ReferenceBlock</tt>,</li> <li>each reference frame listed as a <tt>ReferenceBlock</tt>,</li>
<li>some referenced frame listed as a <tt>ReferenceBlock</tt>, even if the times <li>some referenced frames listed as a <tt>ReferenceBlock</tt>, even if the time
tamp value is accurate,</li> stamp value is accurate, or</li>
<li>or one <tt>ReferenceBlock</tt> with the timestamp value &quot;0&quot; corres <li>one <tt>ReferenceBlock</tt> with the timestamp value "0" corresponding to a
ponding to a self or unknown reference.</li> self or unknown reference.</li>
</ul>
<t>The lack of <tt>ReferenceBlock</tt> would mean such a frame is a RAP and seek
ing on that
frame that actually depends on other frames may create bogus output or even cras
h.</t>
<ul spacing="compact">
<li>Same frame that references another frame put inside a BlockGroup but the ref
erence could not be recovered, with the EBML tree shown as XML:</li>
</ul> </ul>
<t>The lack of <tt>ReferenceBlock</tt> would mean such a frame is a RAP, and see
king on that
frame that actually depends on other frames may create a bogus output or even cr
ash.</t>
<figure><name>Same Frame That References Another Frame Put inside a
<tt>BlockGroup</tt>, but the Reference Could Not Be Recovered, with the EBML Tre
e Shown
as XML</name>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- ReferenceBlock value not recovered from the codec --&gt; &lt;!-- ReferenceBlock value not recovered from the codec --&gt;
&lt;ReferenceBlock&gt;0&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;0&lt;/ReferenceBlock&gt;
&lt;BlockDuration&gt;20&lt;BlockDuration&gt; &lt;BlockDuration&gt;20&lt;/BlockDuration&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
</figure>
<ul spacing="compact"> <figure><name>BlockGroup with a Frame That References Two Other Frames, with the
<li>BlockGroup with a frame that references two other frames, with the EBML tree EBML Tree Shown as XML</name>
shown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- References a Block 80 Track Ticks before this one --&gt; &lt;!-- References a Block 80 Track Ticks before this one --&gt;
&lt;ReferenceBlock&gt;-80&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;-80&lt;/ReferenceBlock&gt;
&lt;!-- References a Block 40 Track Ticks after this one --&gt; &lt;!-- References a Block 40 Track Ticks after this one --&gt;
&lt;ReferenceBlock&gt;40&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;40&lt;/ReferenceBlock&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
</figure>
<t>Intra-only video frames, such as the ones found in AV1 or VP9, can be decoded without any other <t>Intra-only video frames, such as the ones found in AV1 or VP9, can be decoded without any other
frame, but they don't reset the codec state. So seeking to these frames is not p ossible frame, but they don't reset the codec state. Thus, seeking to these frames is no t possible,
as the next frames may need frames that are not known from this seeking point. as the next frames may need frames that are not known from this seeking point.
Such intra-only frames <bcp14>MUST NOT</bcp14> be considered as keyframes so the keyframe flag Such intra-only frames <bcp14>MUST NOT</bcp14> be considered as keyframes, so th e keyframe flag
<bcp14>MUST NOT</bcp14> be set in the <tt>SimpleBlock</tt> or a <tt>ReferenceBlo ck</tt> <bcp14>MUST</bcp14> be used <bcp14>MUST NOT</bcp14> be set in the <tt>SimpleBlock</tt> or a <tt>ReferenceBlo ck</tt> <bcp14>MUST</bcp14> be used
to signify the frame is not a RAP. The timestamp value of the <tt>ReferenceBlock </tt> <bcp14>MUST</bcp14> to signify the frame is not a RAP. The timestamp value of the <tt>ReferenceBlock </tt> <bcp14>MUST</bcp14>
be &quot;0&quot;, meaning it's referencing itself.</t> be "0", meaning it's referencing itself.</t>
<ul spacing="compact">
<li>Intra-only frame not an RAP, with the EBML tree shown as XML:</li>
</ul>
<figure><name>Intra-Only Frame (Not a RAP), with the EBML Tree Shown as XML</nam e>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- References itself to mark it should not be used as RAP --&gt; &lt;!-- References itself to mark it should not be used as RAP --&gt;
&lt;ReferenceBlock&gt;0&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;0&lt;/ReferenceBlock&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
<t>Because a video <tt>SimpleBlock</tt> has less references information than a v </figure>
ideo <tt>BlockGroup</tt>, <t>Because a video <tt>SimpleBlock</tt> has less information on references than
a video <tt>BlockGroup</tt>,
it is possible to remux a video track using <tt>BlockGroup</tt> into a <tt>Simpl eBlock</tt>, it is possible to remux a video track using <tt>BlockGroup</tt> into a <tt>Simpl eBlock</tt>,
as long as it doesn't use any other <tt>BlockGroup</tt> features than <tt>Refere nceBlock</tt>.</t> as long as it doesn't use any other <tt>BlockGroup</tt> features than <tt>Refere nceBlock</tt>.</t>
</section> </section>
</section> </section>
<section anchor="timestamps"><name>Timestamps</name> <section anchor="timestamps"><name>Timestamps</name>
<t>Historically timestamps in Matroska were mistakenly called timecodes. The <tt >Timestamp Element</tt> <t>Historically, timestamps in Matroska were mistakenly called timecodes. The <t t>Timestamp Element</tt>
was called Timecode, the <tt>TimestampScale Element</tt> was called TimecodeScal e, the was called Timecode, the <tt>TimestampScale Element</tt> was called TimecodeScal e, the
<tt>TrackTimestampScale Element</tt> was called TrackTimecodeScale and the <tt>TrackTimestampScale Element</tt> was called TrackTimecodeScale, and the
<tt>ReferenceTimestamp Element</tt> was called ReferenceTimeCode.</t> <tt>ReferenceTimestamp Element</tt> was called ReferenceTimeCode.</t>
<section anchor="timestamp-ticks"><name>Timestamp Ticks</name> <section anchor="timestamp-ticks"><name>Timestamp Ticks</name>
<t>All timestamp values in Matroska are expressed in multiples of a tick. <t>All timestamp values in Matroska are expressed in multiples of a tick.
They are usually stored as integers. They are usually stored as integers.
There are three types of ticks possible:</t>
There are three types of ticks possible: Matroska Ticks, Segment Ticks, and Trac
k Ticks.</t>
<section anchor="matroska-ticks"><name>Matroska Ticks</name> <section anchor="matroska-ticks"><name>Matroska Ticks</name>
<t>For such elements, the timestamp value is stored directly in nanoseconds.</t> <t>The timestamp value is stored directly in nanoseconds.</t>
<t>The elements storing values in Matroska Ticks/nanoseconds are:</t> <t>The elements storing values in Matroska Ticks/nanoseconds are:</t>
<ul spacing="compact"> <ul>
<li><tt>TrackEntry\DefaultDuration</tt>; defined in <xref target="defaultduratio n-element"></xref></li> <li><tt>TrackEntry\DefaultDuration</tt>; defined in <xref target="defaultduratio n-element"></xref></li>
<li><tt>TrackEntry\DefaultDecodedFieldDuration</tt>; defined in <xref target="de faultdecodedfieldduration-element"></xref></li> <li><tt>TrackEntry\DefaultDecodedFieldDuration</tt>; defined in <xref target="de faultdecodedfieldduration-element"></xref></li>
<li><tt>TrackEntry\SeekPreRoll</tt>; defined in <xref target="seekpreroll-elemen t"></xref></li> <li><tt>TrackEntry\SeekPreRoll</tt>; defined in <xref target="seekpreroll-elemen t"></xref></li>
<li><tt>TrackEntry\CodecDelay</tt>; defined in <xref target="codecdelay-element" ></xref></li> <li><tt>TrackEntry\CodecDelay</tt>; defined in <xref target="codecdelay-element" ></xref></li>
<li><tt>BlockGroup\DiscardPadding</tt>; defined in <xref target="discardpadding- element"></xref></li> <li><tt>BlockGroup\DiscardPadding</tt>; defined in <xref target="discardpadding- element"></xref></li>
<li><tt>ChapterAtom\ChapterTimeStart</tt>; defined in <xref target="chaptertimes tart-element"></xref></li> <li><tt>ChapterAtom\ChapterTimeStart</tt>; defined in <xref target="chaptertimes tart-element"></xref></li>
<li><tt>ChapterAtom\ChapterTimeEnd</tt>; defined in <xref target="chaptertimeend -element"></xref></li> <li><tt>ChapterAtom\ChapterTimeEnd</tt>; defined in <xref target="chaptertimeend -element"></xref></li>
<li><tt>CuePoint\CueTime</tt>; defined in <xref target="cuetime-element"></xref>
</li> <!-- [cellar] changed CueTime from Matroska Ticks to Segment Ticks
<li><tt>CueReference\CueRefTime</tt>; defined in <xref target="cuetime-element">
</xref></li> It was brought to our attention after our last submission that this was mistaken
for a Matroska Tick. We fix the issue in our repository in https://github.com/ie
tf-wg-cellar/matroska-specification/pull/814
-->
<!-- [cellar] changed CueRefTime from Matroska Ticks to Segment Ticks
It was brought to our attention after our last submission that this was mistaken
for a Matroska Tick. We fix the issue in our repository in https://github.com/ie
tf-wg-cellar/matroska-specification/pull/815
-->
</ul> </ul>
</section> </section>
<section anchor="segment-ticks"><name>Segment Ticks</name> <section anchor="segment-ticks"><name>Segment Ticks</name>
<t>Elements in Segment Ticks involve the use of the <tt>TimestampScale Element</ tt> of the Segment to get the timestamp <t>Elements in Segment Ticks involve the use of the <tt>TimestampScale Element</ tt> of the <tt>Segment</tt> to get the timestamp
in nanoseconds of the element, with the following formula:</t> in nanoseconds of the element, with the following formula:</t>
<artwork>timestamp in nanosecond = element value * TimestampScale <artwork>timestamp in nanosecond = element value * TimestampScale
</artwork> </artwork>
<t>This allows storing smaller integer values in the elements.</t> <t>This allows for storage of smaller integer values in the elements.</t>
<t>When using the default value of <tt>TimestampScale</tt> of &quot;1,000,000&qu <t>When using the default value of "1,000,000" for <tt>TimestampScale</tt>, one
ot;, one Segment Tick represents one millisecond.</t> Segment Tick represents one millisecond.</t>
<t>The elements storing values in Segment Ticks are:</t> <t>The elements storing values in Segment Ticks are:</t>
<ul spacing="compact"> <ul>
<li><tt>Cluster\Timestamp</tt>; defined in <xref target="timestamp-element"></xr ef></li> <li><tt>Cluster\Timestamp</tt>; defined in <xref target="timestamp-element"></xr ef></li>
<li><tt>Info\Duration</tt> is stored as a floating-point but the same formula ap <li><tt>Info\Duration</tt> is stored as a floating-point, but the same formula a
plies; defined in <xref target="duration-element"></xref></li> pplies; defined in <xref target="duration-element"></xref></li>
<li><tt>CuePoint\CueTime</tt>; defined in <xref target="cuetime-element"></xref>
</li>
<!-- [cellar] changed CueTime from Matroska Ticks to Segment Ticks
It was brought to our attention after our last submission that this was mistaken
for a Matroska Tick. We fix the issue in our repository in https://github.com/ie
tf-wg-cellar/matroska-specification/pull/814
-->
<li><tt>CuePoint\CueTrackPositions\CueDuration</tt>; defined in <xref target="cu eduration-element"></xref></li> <li><tt>CuePoint\CueTrackPositions\CueDuration</tt>; defined in <xref target="cu eduration-element"></xref></li>
<li><tt>CueReference\CueRefTime</tt>; defined in <xref target="cuetime-element">
</xref></li>
<!-- [cellar] changed CueRefTime from Matroska Ticks to Segment Ticks
It was brought to our attention after our last submission that this was mistaken
for a Matroska Tick. We fix the issue in our repository in https://github.com/ie
tf-wg-cellar/matroska-specification/pull/815
-->
</ul> </ul>
</section> </section>
<section anchor="track-ticks"><name>Track Ticks</name> <section anchor="track-ticks"><name>Track Ticks</name>
<t>Elements in Track Ticks involve the use of the <tt>TimestampScale Element</tt > of the Segment and the <tt>TrackTimestampScale Element</tt> of the Track <t>Elements in Track Ticks involve the use of the <tt>TimestampScale Element</tt > of the <tt>Segment</tt> and the <tt>TrackTimestampScale Element</tt> of the Tr ack
to get the timestamp in nanoseconds of the element, with the following formula:< /t> to get the timestamp in nanoseconds of the element, with the following formula:< /t>
<artwork>timestamp in nanoseconds = <artwork>timestamp in nanoseconds =
element value * TrackTimestampScale * TimestampScale element value * TrackTimestampScale * TimestampScale
</artwork> </artwork>
<t>This allows storing smaller integer values in the elements. <t>This allows for storage of smaller integer values in the elements.
The resulting floating-point values of the timestamps are still expressed in nan oseconds.</t> The resulting floating-point values of the timestamps are still expressed in nan oseconds.</t>
<t>When using the default values for <tt>TimestampScale</tt> and <tt>TrackTimest ampScale</tt> of &quot;1,000,000&quot; and of &quot;1.0&quot; respectively, one Track Tick represents one millisecond.</t> <t>When using the default values of "1,000,000" for <tt>TimestampScale</tt> and "1.0" for <tt>TrackTimestampScale</tt>, one Track Tick represents one millisecon d.</t>
<t>The elements storing values in Track Ticks are:</t> <t>The elements storing values in Track Ticks are:</t>
<ul spacing="compact"> <ul>
<li><tt>Cluster\BlockGroup\Block</tt> and <tt>Cluster\SimpleBlock</tt> timestamp s; detailed in <xref target="block-timestamps"></xref></li> <li><tt>Cluster\BlockGroup\Block</tt> and <tt>Cluster\SimpleBlock</tt> timestamp s; detailed in <xref target="block-timestamps"></xref></li>
<li><tt>Cluster\BlockGroup\BlockDuration</tt>; defined in <xref target="blockdur ation-element"></xref></li> <li><tt>Cluster\BlockGroup\BlockDuration</tt>; defined in <xref target="blockdur ation-element"></xref></li>
<li><tt>Cluster\BlockGroup\ReferenceBlock</tt>; defined in <xref target="referen ceblock-element"></xref></li> <li><tt>Cluster\BlockGroup\ReferenceBlock</tt>; defined in <xref target="referen ceblock-element"></xref></li>
</ul> </ul>
<t>When the <tt>TrackTimestampScale</tt> is interpreted as &quot;1.0&quot;, Trac k Ticks are equivalent to Segment Ticks <t>When the <tt>TrackTimestampScale</tt> is interpreted as "1.0", Track Ticks ar e equivalent to Segment Ticks
and give an integer value in nanoseconds. This is the most common case as <tt>Tr ackTimestampScale</tt> is usually omitted.</t> and give an integer value in nanoseconds. This is the most common case as <tt>Tr ackTimestampScale</tt> is usually omitted.</t>
<t>A value of <tt>TrackTimestampScale</tt> other than &quot;1.0&quot; <bcp14>MAY </bcp14> be used <t>A value of <tt>TrackTimestampScale</tt> other than "1.0" <bcp14>MAY</bcp14> b e used
to scale the timestamps more in tune with each Track sampling frequency. to scale the timestamps more in tune with each Track sampling frequency.
For historical reasons, a lot of Matroska readers don't take the <tt>TrackTimest For historical reasons, a lot of Matroska Readers don't take the <tt>TrackTimest
ampScale</tt> value in account. ampScale</tt> value into account. Thus, using a value other than "1.0" might not
So using a value other than &quot;1.0&quot; might not work in many places.</t> work in many places.</t>
</section> </section>
</section> </section>
<section anchor="block-timestamps"><name>Block Timestamps</name> <section anchor="block-timestamps"><name>Block Timestamps</name>
<t>A <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> timestamp is the ti me when the decoded data of the first <t>A <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> timestamp is the ti me when the decoded data of the first
frame in the Block/SimpleBlock <bcp14>MUST</bcp14> be presented, if the track of that Block/SimpleBlock is selected for playback. frame in the <tt>Block</tt>/<tt>SimpleBlock</tt> <bcp14>MUST</bcp14> be presente d if the track of that <tt>Block</tt>/<tt>SimpleBlock</tt> is selected for playb ack.
This is also known as the Presentation Timestamp (PTS).</t> This is also known as the Presentation Timestamp (PTS).</t>
<t>The <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> store their times tamps as signed integers, relative <t>The <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> store their times tamps as signed integers, relative
to the <tt>Cluster\Timestamp</tt> value of the <tt>Cluster</tt> they are stored in. to the <tt>Cluster\Timestamp</tt> value of the <tt>Cluster</tt> they are stored in.
To get the timestamp of a <tt>Block</tt> or <tt>SimpleBlock</tt> in nanoseconds To get the timestamp of a <tt>Block</tt> or <tt>SimpleBlock</tt> in nanoseconds,
you have to use the following formula:</t> the following formula is used:</t>
<artwork>( Cluster\Timestamp + ( block timestamp * TrackTimestampScale ) ) * <artwork>( Cluster\Timestamp + ( block timestamp * TrackTimestampScale ) ) *
TimestampScale TimestampScale
</artwork> </artwork>
<t>The <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> store their times <t>The <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> store their times
tamps as 16bit signed integers, tamps as 16-bit signed integers,
allowing a range from &quot;-32768&quot; to &quot;+32767&quot; Track Ticks. allowing a range from "-32768" to "+32767" Track Ticks.
Although these values can be negative, when added to the <tt>Cluster\Timestamp</ tt>, the resulting frame timestamp <bcp14>SHOULD NOT</bcp14> be negative.</t> Although these values can be negative, when added to the <tt>Cluster\Timestamp</ tt>, the resulting frame timestamp <bcp14>SHOULD NOT</bcp14> be negative.</t>
<t>When a <tt>CodecDelay Element</tt> is set, its value <bcp14>MUST</bcp14> be s ubstracted from each Block timestamp of that track. <t>When a <tt>CodecDelay Element</tt> is set, its value <bcp14>MUST</bcp14> be s ubstracted from each <tt>Block</tt> timestamp of that track.
To get the timestamp in nanoseconds of the first frame in a <tt>Block</tt> or <t t>SimpleBlock</tt>, the formula becomes:</t> To get the timestamp in nanoseconds of the first frame in a <tt>Block</tt> or <t t>SimpleBlock</tt>, the formula becomes:</t>
<artwork>( ( Cluster\Timestamp + ( block timestamp * TrackTimestampScale ) ) * <artwork>( ( Cluster\Timestamp + ( block timestamp * TrackTimestampScale ) ) *
TimestampScale ) - CodecDelay TimestampScale ) - CodecDelay
</artwork> </artwork>
<t>The resulting frame timestamp <bcp14>SHOULD NOT</bcp14> be negative.</t> <t>The resulting frame timestamp <bcp14>SHOULD NOT</bcp14> be negative.</t>
<t>During playback, when a frame has a negative timestamp, the content <bcp14>MU ST</bcp14> be decoded by the decoder but not played to the user.</t> <t>During playback, when a frame has a negative timestamp, the content <bcp14>MU ST</bcp14> be decoded by the decoder but not played to the user.</t>
</section> </section>
<section anchor="timestampscale-rounding"><name>TimestampScale Rounding</name> <section anchor="timestampscale-rounding"><name>TimestampScale Rounding</name>
<t>The default Track Tick duration is one millisecond.</t> <t>The default Track Tick duration is one millisecond.</t>
<t>The <tt>TimestampScale</tt> is a floating-point value, which is usually 1.0. <t>The <tt>TimestampScale</tt> is a floating-point value that is usually "1.0".
But when it's not, the multiplied But when it's not, the multiplied
Block Timestamp is a floating-point value in nanoseconds. <tt>Block</tt> Timestamp is a floating-point value in nanoseconds.
The <tt>Matroska Reader</tt> <bcp14>SHOULD</bcp14> use the nearest rounding valu The Matroska Reader <bcp14>SHOULD</bcp14> use the nearest rounding value in nano
e in nanosecond to get seconds to get
the proper nanosecond timestamp of a Block. This allows some clever <tt>Timestam pScale</tt> values the proper nanosecond timestamp of a Block. This allows some clever <tt>Timestam pScale</tt> values
to have more refined timestamp precision per frame.</t> to have a more refined timestamp precision per frame.</t>
</section> </section>
</section> </section>
<section anchor="language-codes"><name>Language Codes</name> <section anchor="language-codes"><name>Language Codes</name>
<t>Matroska from version 1 through 3 uses language codes that can be either the
3 letters <t>Matroska versions 1 through 3 use language codes that can be either the three
bibliographic ISO-639-2 form <xref target="ISO639-2"></xref> (like &quot;fre&quo -letter
t; for French), bibliographic ISO 639-2 form <xref target="ISO639-2"></xref> (like "fre" for Fre
or such a language code followed by a dash and a country code for specialities i nch)
n languages (like &quot;fre-ca&quot; for Canadian French). or such a language code followed by a dash and a country code for specialities i
The <tt>ISO 639-2 Language Elements</tt> are &quot;Language Element&quot;, &quot n languages (like "fre-ca" for Canadian French).
;TagLanguage Element&quot;, and &quot;ChapLanguage Element&quot;.</t> The <tt>ISO 639-2 Language Elements</tt> are "<tt>Language</tt> Element", "<tt>T
<t>Starting in Matroska version 4, either <xref target="ISO639-2"></xref> or <xr agLanguage</tt> Element", and "<tt>ChapLanguage</tt> Element".</t>
ef target="BCP47"></xref> <bcp14>MAY</bcp14> be used,
although <tt>BCP 47</tt> is <bcp14>RECOMMENDED</bcp14>. The <tt>BCP 47 Language <t>Starting in Matroska version 4, the forms defined in either <xref target="ISO
Elements</tt> are &quot;LanguageBCP47 Element&quot;, 639-2"></xref> or
&quot;TagLanguageBCP47 Element&quot;, and &quot;ChapLanguageBCP47 Element&quot;. <xref target="RFC5646"></xref> <bcp14>MAY</bcp14> be used, although the form in
If a <tt>BCP 47 Language Element</tt> and an <tt>ISO 639-2 Language Element</tt <xref target="RFC5646"></xref> is <bcp14>RECOMMENDED</bcp14>. The <tt>Language E
> lements</tt> in the <xref target="RFC5646"></xref> form
are used within the same <tt>Parent Element</tt>, then the <tt>ISO 639-2 Languag are "<tt>LanguageBCP47</tt> Element", "<tt>TagLanguageBCP47</tt> Element", and
e Element</tt> <bcp14>MUST</bcp14> be ignored and precedence given to the <tt>BC "<tt>ChapLanguageBCP47</tt> Element". If both an <tt><xref target="ISO639-2"></x
P 47 Language Element</tt>.</t> ref> Language Element</tt> and an <tt><xref target="RFC5646"></xref> Language El
ement</tt> are used within the same <tt>Parent
Element</tt>, then the <tt>Language Element</tt> in the <xref target="ISO639-2">
</xref> form <bcp14>MUST</bcp14>
be ignored and precedence given to the <tt>Language Element</tt> in the <xref ta
rget="RFC5646"></xref> form.</t>
<t>In this document, "BCP47" in element names refers specifically to
<xref target="RFC5646"/>, which is part of BCP 47.</t>
</section> </section>
<section anchor="country-codes"><name>Country Codes</name> <section anchor="country-codes"><name>Country Codes</name>
<t>Country codes are the <xref target="BCP47"></xref> two-letter region subtag, without the UK exception.</t> <t>Country codes are the <xref target="RFC5646"></xref> two-letter region subtag s, without the UK exception.</t>
</section> </section>
<section anchor="encryption"><name>Encryption</name> <section anchor="encryption"><name>Encryption</name>
<t>This Matroska specification provides no interoperable solution for securing t
he <t>This Matroska specification provides no interoperable solution for
data container with any assurances of confidentiality, integrity, authenticity, securing the data container with any assurances of confidentiality, integrity,
or to provide authorization. The <tt>ContentEncryption Element</tt> (<xref targe authenticity, or authorization. The <tt>ContentEncryption Element</tt> (<xref
t="contentencryption-element"></xref>) target="contentencryption-element"></xref>) and associated sub-fields (<xref
and associated sub-fields (<xref target="contentencalgo-element"></xref> to <xre target="contentencalgo-element"></xref> to <xref
f target="aessettingsciphermode-element"></xref>) are defined target="aessettingsciphermode-element"></xref>) are defined only for the
only for the benefit of implementers to construct their own proprietary solution benefit of implementers to construct their own proprietary solution or as the
or as the basis for further standardization activities. How to use these basis for further standardization activities. How to use these fields to
fields to secure a Matroska data container is out of scope, as are any related secure a Matroska data container is out of scope, as are any related issues
issues such as key management and distribution.</t> such as key management and distribution.</t>
<t>A <tt>Matroska Reader</tt> who encounters containers that use the fields defi <t>A Matroska Reader who encounters containers that use the fields defined in th
ned in this is
section <bcp14>MUST</bcp14> rely on out-of-scope guidance to decode the associat ed content.</t> section <bcp14>MUST</bcp14> rely on out-of-scope guidance to decode the associat ed content.</t>
<t>Because encryption occurs within the <tt>Block Element</tt>, it is possible t o manipulate <t>Because encryption occurs within the <tt>Block Element</tt>, it is possible t o manipulate
encrypted streams without decrypting them. The streams could potentially be copi ed, encrypted streams without decrypting them. The streams could potentially be copi ed,
deleted, cut, appended, or any number of other possible editing techniques witho ut deleted, cut, appended, or any number of other possible editing techniques witho ut
decryption. The data can be used without having to expose it or go through the d ecrypting process.</t> decryption. The data can be used without having to expose it or go through the d ecrypting process.</t>
<t>Encryption can also be layered within Matroska. This means that two completel y different <t>Encryption can also be layered within Matroska. This means that two completel y different
types of encryption can be used, requiring two separate keys to be able to decry pt a stream.</t> types of encryption can be used, requiring two separate keys to be able to decry pt a stream.</t>
<t>Encryption information is stored in the <tt>ContentEncodings Element</tt> und er the <tt>ContentEncryption Element</tt>.</t> <t>Encryption information is stored in the <tt>ContentEncodings Element</tt> und er the <tt>ContentEncryption Element</tt>.</t>
<t>For encryption systems sharing public/private keys, the creation of the keys and the exchange of keys <t>For encryption systems sharing public/private keys, the creation of the keys and the exchange of keys
are not covered by this document. They have to be handled by the system using Ma troska.</t> are not covered by this document. They have to be handled by the system using Ma troska.</t>
<t>The algorithms described in <xref target="ContentEncAlgoValues"></xref> suppo rt <t>The algorithms described in <xref target="ContentEncAlgoValues"></xref> suppo rt
different modes of operations and key sizes. The specification of these different modes of operations and key sizes. The specification of these
parameters is required for a complete solution, but is out of scope of this parameters is required for a complete solution but is out of scope of this
document and left to the proprietary implementations using them or subsequent document and left to the proprietary implementations using them or subsequent
profiles of this document.</t> profiles of this document.</t>
<t>The <tt>ContentEncodingScope Element</tt> gives an idea of which part of the <t>The <tt>ContentEncodingScope Element</tt> gives an idea of which part of the
track are encrypted. track is encrypted, but each <tt>ContentEncAlgo Element</tt> and its sub-element
But each <tt>ContentEncAlgo Element</tt> and its sub elements like <tt>AESSettin s (like <tt>AESSettingsCipherMode</tt>)
gsCipherMode</tt> really define exactly how the encrypted track should be interpreted.</t>
define how the encrypted should be exactly interpreted.</t>
<t>An example of an extension that builds upon these security-related fields in this specification is <xref target="WebM-Enc"></xref>. <t>An example of an extension that builds upon these security-related fields in this specification is <xref target="WebM-Enc"></xref>.
It uses AES-CTR, <tt>ContentEncAlgo</tt> = 5 (<xref target="contentencalgo-eleme It uses AES-CTR, <tt>ContentEncAlgo</tt> = 5 (<xref target="contentencalgo-eleme
nt"></xref>) and <tt>AESSettingsCipherMode</tt> = 1 (<xref target="aessettingsci nt"></xref>), and <tt>AESSettingsCipherMode</tt> = 1 (<xref target="aessettingsc
phermode-element"></xref>).</t> iphermode-element"></xref>).</t>
<t>A <tt>Matroska Writer</tt> <bcp14>MUST NOT</bcp14> use insecure cryptographic <t>A Matroska Writer <bcp14>MUST NOT</bcp14> use insecure cryptographic algorith
algorithms to create new ms to create new
archives or streams, but a <tt>Matroska Reader</tt> <bcp14>MAY</bcp14> support t archives or streams, but a Matroska Reader <bcp14>MAY</bcp14> support these algo
hese algorithms to read rithms to read
previously made archives or stream.</t> previously made archives or streams.</t>
</section> </section>
<section anchor="image-presentation"><name>Image Presentation</name> <section anchor="image-presentation"><name>Image Presentation</name>
<section anchor="cropping"><name>Cropping</name> <section anchor="cropping"><name>Cropping</name>
<t>The <tt>PixelCrop Elements</tt> (<tt>PixelCropTop</tt>, <tt>PixelCropBottom</ tt>, <tt>PixelCropRight</tt>, and <tt>PixelCropLeft</tt>) <t>The <tt>PixelCrop Elements</tt> (<tt>PixelCropTop</tt>, <tt>PixelCropBottom</ tt>, <tt>PixelCropRight</tt>, and <tt>PixelCropLeft</tt>)
indicate when, and by how much, encoded videos frames <bcp14>SHOULD</bcp14> be c indicate when, and by how much, encoded video frames <bcp14>SHOULD</bcp14> be cr
ropped for display. opped for display.
These Elements allow edges of the frame that are not intended for display, such These Elements allow edges of the frame that are not intended for display (such
as the as the
sprockets of a full-frame film scan or the VANC area of a digitized analog video sprockets of a full-frame film scan or the Video ANCillary (VANC) area of a digi
tape, tized analog videotape) to be stored but hidden. <tt>PixelCropTop</tt> and <tt>
to be stored but hidden. <tt>PixelCropTop</tt> and <tt>PixelCropBottom</tt> stor PixelCropBottom</tt> store an integer of how many
e an integer of how many rows of pixels <bcp14>SHOULD</bcp14> be cropped from the top and bottom of the i
rows of pixels <bcp14>SHOULD</bcp14> be cropped from the top and bottom of the i mage, respectively.
mage (respectively).
<tt>PixelCropLeft</tt> and <tt>PixelCropRight</tt> store an integer of how many columns of pixels <tt>PixelCropLeft</tt> and <tt>PixelCropRight</tt> store an integer of how many columns of pixels
<bcp14>SHOULD</bcp14> be cropped from the left and right of the image (respecti vely).</t> <bcp14>SHOULD</bcp14> be cropped from the left and right of the image, respecti vely.</t>
<t>For example, <t>For example,
a pillar-boxed video that stores a 1440x1080 visual image within the center of a padded a pillar-boxed video that stores a 1440x1080 visual image within the center of a padded
1920x1080 encoded image may set both <tt>PixelCropLeft</tt> and <tt>PixelCropRi 1920x1080 encoded image may set both <tt>PixelCropLeft</tt> and <tt>PixelCropRi
ght</tt> to &quot;240&quot;, ght</tt> to "240",
so that a <tt>Matroska Player</tt> should crop off 240 columns of pixels from t so a Matroska Player should crop off 240 columns of pixels from the left and
he left and
right of the encoded image to present the image with the pillar-boxes hidden.</ t> right of the encoded image to present the image with the pillar-boxes hidden.</ t>
<t>Cropping has to be performed before resizing and the display dimensions given by <t>Cropping has to be performed before resizing and the display dimensions given by
<tt>DisplayWidth</tt>, <tt>DisplayHeight</tt> and <tt>DisplayUnit</tt> apply to the already cropped image.</t> <tt>DisplayWidth</tt>, <tt>DisplayHeight</tt>, and <tt>DisplayUnit</tt> apply t o the already-cropped image.</t>
</section> </section>
<section anchor="rotation"><name>Rotation</name> <section anchor="rotation"><name>Rotation</name>
<t>The ProjectionPoseRoll Element (see <xref target="projectionposeroll-element" ></xref>) can be used to indicate <t>The <tt>ProjectionPoseRoll </tt>Element (<xref target="projectionposeroll-ele ment"></xref>) can be used to indicate
that the image from the associated video track <bcp14>SHOULD</bcp14> be rotated for presentation. that the image from the associated video track <bcp14>SHOULD</bcp14> be rotated for presentation.
For instance, the following representation of the Projection Element <xref targe For instance, the following example of the <tt>Projection</tt> Element (<xref t
t="projection-element"></xref>) arget="projection-element"></xref>)
and the ProjectionPoseRoll Element represents a video track where the image <bcp and the <tt>ProjectionPoseRoll</tt> Element represents a video track where the i
14>SHOULD</bcp14> be mage <bcp14>SHOULD</bcp14> be
presented with a 90-degree counter-clockwise rotation, with the EBML tree shown presented with a 90-degree counter-clockwise rotation, with the EBML tree shown
as XML :</t> as XML:</t>
<figure><name>Rotation example. <figure><name>Rotation Example
</name> </name>
<sourcecode type="xml">&lt;Projection&gt; <sourcecode type="xml">&lt;Projection&gt;
&lt;ProjectionPoseRoll&gt;90&lt;/ProjectionPoseRoll&gt; &lt;ProjectionPoseRoll&gt;90&lt;/ProjectionPoseRoll&gt;
&lt;/Projection&gt; &lt;/Projection&gt;
</sourcecode> </sourcecode>
</figure> </figure>
</section> </section>
</section> </section>
<section anchor="segment-position"><name>Segment Position</name> <section anchor="segment-position"><name>Segment Position</name>
<t>The <tt>Segment Position</tt> of an <tt>Element</tt> refers to the position o
f the first octet of the <t>The <tt>Segment Position</tt> of an Element refers to the position of the fir
<tt>Element ID</tt> of that <tt>Element</tt>, measured in octets, from the begin st octet of the
ning of the <tt>Element Data</tt> <tt>Element ID</tt> of that Element, measured in octets, from the beginning of t
he <tt>Element Data</tt>
section of the containing <tt>Segment Element</tt>. In other words, the <tt>Segm ent Position</tt> of an section of the containing <tt>Segment Element</tt>. In other words, the <tt>Segm ent Position</tt> of an
<tt>Element</tt> is the distance in octets from the beginning of its containing <tt>Segment Element</tt> Element is the distance in octets from the beginning of its containing <tt>Segme nt Element</tt>
minus the size of the <tt>Element ID</tt> and <tt>Element Data Size</tt> of that <tt>Segment Element</tt>. minus the size of the <tt>Element ID</tt> and <tt>Element Data Size</tt> of that <tt>Segment Element</tt>.
The <tt>Segment Position</tt> of the first <tt>Child Element</tt> of the <tt>Seg ment Element</tt> is 0. The <tt>Segment Position</tt> of the first <tt>Child Element</tt> of the <tt>Seg ment Element</tt> is 0.
An <tt>Element</tt> which is not stored within a <tt>Segment Element</tt>, such as the <tt>Elements</tt> of An Element that is not stored within a <tt>Segment Element</tt>, such as the <tt >Elements</tt> of
the <tt>EBML Header</tt>, do not have a <tt>Segment Position</tt>.</t> the <tt>EBML Header</tt>, do not have a <tt>Segment Position</tt>.</t>
<section anchor="segment-position-exception"><name>Segment Position Exception</n ame> <section anchor="segment-position-exception"><name>Segment Position Exception</n ame>
<t><tt>Elements</tt> that are defined to store a <tt>Segment Position</tt> <bcp1 4>MAY</bcp14> define reserved values to <t><tt>Elements</tt> that are defined to store a <tt>Segment Position</tt> <bcp1 4>MAY</bcp14> define reserved values to
indicate a special meaning.</t> indicate a special meaning.</t>
</section> </section>
<section anchor="example-of-segment-position"><name>Example of Segment Position< /name> <section anchor="example-of-segment-position"><name>Example of Segment Position< /name>
<t>This table presents an example of <tt>Segment Position</tt> by showing a hexa decimal representation <t>This table presents an example of <tt>Segment Position</tt> by showing a hexa decimal representation
of a very small Matroska file with labels to show the offsets in octets. The fil e contains of a very small Matroska file with labels to show the offsets in octets. The fil e contains
a <tt>Segment Element</tt> with an <tt>Element ID</tt> of &quot;0x18538067&quot; and a <tt>MuxingApp Element</tt> with an <tt>Element ID</tt> of &quot;0x4D80&qu ot;.</t> a <tt>Segment Element</tt> with an <tt>Element ID</tt> of "0x18538067" and a <tt >MuxingApp Element</tt> with an <tt>Element ID</tt> of "0x4D80".</t>
<artwork> 0 1 2 <artwork>
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 0 1 2
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
0 |1A|45|DF|A3|8B|42|82|88|6D|61|74|72|6F|73|6B|61| +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
^ EBML Header 0 |1A|45|DF|A3|8B|42|82|88|6D|61|74|72|6F|73|6B|61|
0 | |18|53|80|67| ^ EBML Header
^ Segment ID 0 | |18|53|80|67|
20 |93| ^ Segment ID
^ Segment Data Size 20 |93|
20 | |15|49|A9|66|8E|4D|80|84|69|65|74|66|57|41|84|69|65|74|66| ^ Segment Data Size
^ Start of Segment data 20 | |15|49|A9|66|8E|4D|80|84|69|65|74|66|57|41|84|69|65|74|66|
20 | |4D|80|84|69|65|74|66|57|41|84|69|65|74|66| ^ Start of Segment data
^ MuxingApp start 20 | |4D|80|84|69|65|74|66|57|41|84|69|65|74|66|
^ MuxingApp start
</artwork> </artwork>
<t>In the above example, the <tt>Element ID</tt> of the <tt>Segment Element</tt> is stored at offset 16, <t>In the above example, the <tt>Element ID</tt> of the <tt>Segment Element</tt> is stored at offset 16,
the <tt>Element Data Size</tt> of the <tt>Segment Element</tt> is stored at offs et 20, and the the <tt>Element Data Size</tt> of the <tt>Segment Element</tt> is stored at offs et 20, and the
<tt>Element Data</tt> of the <tt>Segment Element</tt> is stored at offset 21.</t > <tt>Element Data</tt> of the <tt>Segment Element</tt> is stored at offset 21.</t >
<t>The <tt>MuxingApp Element</tt> is stored at offset 26. Since the <tt>Segment Position</tt> of <t>The <tt>MuxingApp Element</tt> is stored at offset 26. Since the <tt>Segment Position</tt> of
an <tt>Element</tt> is calculated by subtracting the position of the <tt>Element an Element is calculated by subtracting the position of the <tt>Element Data</tt
Data</tt> of > of
the containing <tt>Segment Element</tt> from the position of that <tt>Element</t the containing <tt>Segment Element</tt> from the position of that Element, the <
t>, the <tt>Segment Position</tt> tt>Segment Position</tt>
of <tt>MuxingApp Element</tt> in the above example is '26 - 21' or '5'.</t> of the <tt>MuxingApp Element</tt> in the above example is "26 - 21" or "5".</t>
</section> </section>
</section> </section>
<section anchor="linked-segments"><name>Linked Segments</name> <section anchor="linked-segments"><name>Linked Segments</name>
<t>Matroska provides several methods to link two or more <tt>Segment Elements</t t> together to create <t>Matroska provides several methods to link two or more <tt>Segment Elements</t t> together to create
a <tt>Linked Segment</tt>. A <tt>Linked Segment</tt> is a set of multiple <tt>Se gments</tt> linked together into a <tt>Linked Segment</tt>. A <tt>Linked Segment</tt> is a set of multiple <tt>Se gments</tt> linked together into
a single presentation by using Hard Linking or Medium Linking.</t> a single presentation by using Hard Linking or Medium Linking.</t>
<t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>MUST</bcp14> ha ve a <tt>SegmentUUID</tt>.</t> <t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>MUST</bcp14> ha ve a <tt>SegmentUUID</tt>.</t>
<t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>SHOULD</bcp14> be stored within the same directory <t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>SHOULD</bcp14> be stored within the same directory
or be accessible quickly based on their <tt>SegmentUUID</tt> or be quickly accessible based on their <tt>SegmentUUID</tt>
in order to have seamless transition between segments.</t> in order to have a seamless transition between segments.</t>
<t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>MAY</bcp14> set a <tt>SegmentFamily</tt> with a common value to make <t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>MAY</bcp14> set a <tt>SegmentFamily</tt> with a common value to make
it easier for a <tt>Matroska Player</tt> to know which <tt>Segments</tt> are mea it easier for a Matroska Player to know which <tt>Segments</tt> are meant to be
nt to be played together.</t> played together.</t>
<t>The <tt>SegmentFilename</tt>, <tt>PrevFilename</tt> and <tt>NextFilename</tt> <t>The <tt>SegmentFilename</tt>, <tt>PrevFilename</tt>, and <tt>NextFilename</tt
elements <bcp14>MAY</bcp14> also give hints on > elements <bcp14>MAY</bcp14> also give hints on
the original filenames that were used when the Segment links were created, in ca the original filenames that were used when the <tt>Segment</tt> links were creat
se some <tt>SegmentUUID</tt> are damaged.</t> ed, in case some <tt>SegmentUUIDs</tt> are damaged.</t>
<section anchor="hard-linking"><name>Hard Linking</name> <section anchor="hard-linking"><name>Hard Linking</name>
<t>Hard Linking, also called splitting, is the process of creating a <tt>Linked Segment</tt> <t>Hard Linking, also called "splitting", is the process of creating a <tt>Linke d Segment</tt>
by linking multiple <tt>Segment Elements</tt> using the <tt>NextUUID</tt> and <t t>PrevUUID</tt> Elements.</t> by linking multiple <tt>Segment Elements</tt> using the <tt>NextUUID</tt> and <t t>PrevUUID</tt> Elements.</t>
<t>All <tt>Segments</tt> within a <tt>Hard Linked Segment</tt> <bcp14>MUST</bcp1 4> use the same <tt>Tracks</tt> list and <tt>TimestampScale</tt>.</t> <t>All <tt>Segments</tt> within a <tt>Hard Linked Segment</tt> <bcp14>MUST</bcp1 4> use the same <tt>Tracks</tt> list and <tt>TimestampScale</tt>.</t>
<t>Within a <tt>Linked Segment</tt>, the timestamps of <tt>Block</tt> and <tt>Si mpleBlock</tt> <bcp14>MUST</bcp14> follow consecutively <t>Within a <tt>Linked Segment</tt>, the timestamps of <tt>Block</tt> and <tt>Si mpleBlock</tt> <bcp14>MUST</bcp14> consecutively follow
the timestamps of <tt>Block</tt> and <tt>SimpleBlock</tt> from the previous <tt> Segment</tt> in linking order.</t> the timestamps of <tt>Block</tt> and <tt>SimpleBlock</tt> from the previous <tt> Segment</tt> in linking order.</t>
<t>With Hard Linking, the chapters of any <tt>Segment</tt> within the <tt>Linked Segment</tt> <bcp14>MUST</bcp14> only reference the current <tt>Segment</tt>. <t>With Hard Linking, the chapters of any <tt>Segment</tt> within the <tt>Linked Segment</tt> <bcp14>MUST</bcp14> only reference the current <tt>Segment</tt>.
The <tt>NextUUID</tt> and <tt>PrevUUID</tt> reference the respective <tt>Segment UUID</tt> values of the next and previous <tt>Segments</tt>.</t> The <tt>NextUUID</tt> and <tt>PrevUUID</tt> reference the respective <tt>Segment UUID</tt> values of the next and previous <tt>Segments</tt>.</t>
<t>The first <tt>Segment</tt> of a <tt>Linked Segment</tt> <bcp14>MUST NOT</bcp1 4> have a <tt>PrevUUID Element</tt>. <t>The first <tt>Segment</tt> of a <tt>Linked Segment</tt> <bcp14>MUST NOT</bcp1 4> have a <tt>PrevUUID Element</tt>.
The last <tt>Segment</tt> of a <tt>Linked Segment</tt> <bcp14>MUST NOT</bcp14> h ave a <tt>NextUUID Element</tt>.</t> The last <tt>Segment</tt> of a <tt>Linked Segment</tt> <bcp14>MUST NOT</bcp14> h ave a <tt>NextUUID Element</tt>.</t>
<t>For each node of the chain of <tt>Segments</tt> of a <tt>Linked Segment</tt>
at least one <tt>Segment</tt> <bcp14>MUST</bcp14> reference the other <tt>Segmen <t>For each node of the chain of <tt>Segments</tt> of a <tt>Linked Segment</tt>,
t</tt> within the chain.</t> at least one <tt>Segment</tt> <bcp14>MUST</bcp14> reference the other <tt>Segme
<t>In a chain of <tt>Segments</tt> of a <tt>Linked Segment</tt> the <tt>NextUUID nt</tt> within the chain.</t>
</tt> always takes precedence over the <tt>PrevUUID</tt>. <t>In a chain of <tt>Segments</tt> of a <tt>Linked Segment</tt>, the <tt>NextUUI
So if SegmentA has a <tt>NextUUID</tt> to SegmentB and SegmentB has a <tt>PrevUU D</tt> always takes precedence over the <tt>PrevUUID</tt>.
ID</tt> to SegmentC, Thus, if SegmentA has a <tt>NextUUID</tt> to SegmentB and SegmentB has a <tt>Pre
the link to use is <tt>NextUUID</tt> between SegmentA and SegmentB, SegmentC is vUUID</tt> to SegmentC,
not part of the Linked Segment.</t> the link to use is <tt>NextUUID</tt> between SegmentA and SegmentB, and SegmentC
<t>If SegmentB has a <tt>PrevUUID</tt> to SegmentA but SegmentA has no <tt>NextU is not part of the <tt>Linked Segment</tt>.</t>
UID</tt>, then the Matroska Player <t>If SegmentB has a <tt>PrevUUID</tt> to SegmentA, but SegmentA has no <tt>Next
<bcp14>MAY</bcp14> consider these two Segments linked as SegmentA followed by Se UUID</tt>, then the Matroska Player
gmentB.</t> <bcp14>MAY</bcp14> consider these two <tt>Segments</tt> linked as SegmentA follo
wed by SegmentB.</t>
<t>As an example, three <tt>Segments</tt> can be Hard Linked as a <tt>Linked Seg ment</tt> through <t>As an example, three <tt>Segments</tt> can be Hard Linked as a <tt>Linked Seg ment</tt> through
cross-referencing each other with <tt>SegmentUUID</tt>, <tt>PrevUUID</tt>, and < tt>NextUUID</tt>, as in this table:</t> cross-referencing each other with <tt>SegmentUUID</tt>, <tt>PrevUUID</tt>, and < tt>NextUUID</tt> as shown in this table:</t>
<table anchor="hardLinkingUIDs"><name>Usual Hard Linking UIDs</name> <table anchor="hardLinkingUIDs"><name>Usual Hard Linking UIDs</name>
<thead> <thead>
<tr> <tr>
<th align="left">file name</th> <th align="left">file name</th>
<th align="left"><tt>SegmentUUID</tt></th> <th align="left"><tt>SegmentUUID</tt></th>
<th align="left"><tt>PrevUUID</tt></th> <th align="left"><tt>PrevUUID</tt></th>
<th align="left"><tt>NextUUID</tt></th> <th align="left"><tt>NextUUID</tt></th>
</tr> </tr>
</thead> </thead>
skipping to change at line 6239 skipping to change at line 6473
<td align="left">6c92285fa6d3e827 b198d120ea3ac674</td> <td align="left">6c92285fa6d3e827 b198d120ea3ac674</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>end.mkv</tt></td> <td align="left"><tt>end.mkv</tt></td>
<td align="left">6c92285fa6d3e827 b198d120ea3ac674</td> <td align="left">6c92285fa6d3e827 b198d120ea3ac674</td>
<td align="left">a77b3598941cb803 eac0fcdafe44fac9</td> <td align="left">a77b3598941cb803 eac0fcdafe44fac9</td>
<td align="left">Invalid</td> <td align="left">Invalid</td>
</tr> </tr>
</tbody> </tbody>
</table><t>An other example where only the <tt>NextUUID</tt> Element is used:</t > </table><t>An example where only the <tt>NextUUID</tt> Element is used:</t>
<table anchor="hardLinkingWoPrevUUID"><name>Hard Linking without PrevUUID</name> <table anchor="hardLinkingWoPrevUUID"><name>Hard Linking without PrevUUID</name>
<thead> <thead>
<tr> <tr>
<th align="left">file name</th> <th align="left">file name</th>
<th align="left"><tt>SegmentUUID</tt></th> <th align="left"><tt>SegmentUUID</tt></th>
<th align="left"><tt>PrevUUID</tt></th> <th align="left"><tt>PrevUUID</tt></th>
<th align="left"><tt>NextUUID</tt></th> <th align="left"><tt>NextUUID</tt></th>
</tr> </tr>
</thead> </thead>
skipping to change at line 6305 skipping to change at line 6539
<td align="left">n/a</td> <td align="left">n/a</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>end.mkv</tt></td> <td align="left"><tt>end.mkv</tt></td>
<td align="left">6c92285fa6d3e827 b198d120ea3ac674</td> <td align="left">6c92285fa6d3e827 b198d120ea3ac674</td>
<td align="left">a77b3598941cb803 eac0fcdafe44fac9</td> <td align="left">a77b3598941cb803 eac0fcdafe44fac9</td>
<td align="left">Invalid</td> <td align="left">Invalid</td>
</tr> </tr>
</tbody> </tbody>
</table><t>In this example only the <tt>middle.mkv</tt> is using the <tt>PrevUUI </table><t>An example where only the <tt>middle.mkv</tt> is using the <tt>PrevUU
D</tt> and <tt>NextUUID</tt> Elements:</t> ID</tt> and <tt>NextUUID</tt> Elements:</t>
<table anchor="hardLinkingMixedUIDs"><name>Hard Linking with mixed UID links</na <table anchor="hardLinkingMixedUIDs"><name>Hard Linking with Mixed UID Links</na
me> me>
<thead> <thead>
<tr> <tr>
<th align="left">file name</th> <th align="left">file name</th>
<th align="left"><tt>SegmentUUID</tt></th> <th align="left"><tt>SegmentUUID</tt></th>
<th align="left"><tt>PrevUUID</tt></th> <th align="left"><tt>PrevUUID</tt></th>
<th align="left"><tt>NextUUID</tt></th> <th align="left"><tt>NextUUID</tt></th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
skipping to change at line 6341 skipping to change at line 6575
<tr> <tr>
<td align="left"><tt>end.mkv</tt></td> <td align="left"><tt>end.mkv</tt></td>
<td align="left">6c92285fa6d3e827 b198d120ea3ac674</td> <td align="left">6c92285fa6d3e827 b198d120ea3ac674</td>
<td align="left">n/a</td> <td align="left">n/a</td>
<td align="left">Invalid</td> <td align="left">Invalid</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
<section anchor="medium-linking"><name>Medium Linking</name> <section anchor="medium-linking"><name>Medium Linking</name>
<t>Medium Linking creates relationships between <tt>Segments</tt> using Ordered <t>Medium Linking creates relationships between <tt>Segments</tt> using <tt>Orde
Chapters (<xref target="editionflagordered"></xref>) and the red Chapters</tt> (<xref target="editionflagordered"></xref>) and the
<tt>ChapterSegmentUUID Element</tt>. A <tt>Chapter Edition</tt> with Ordered Cha <tt>ChapterSegmentUUID Element</tt>. A <tt>Chapter Edition</tt> with <tt>Ordered
pters <bcp14>MAY</bcp14> contain Chapters</tt> <bcp14>MAY</bcp14> contain
Chapter elements that reference timestamp ranges from other <tt>Segments</tt>. T <tt>Chapters</tt> elements that reference timestamp ranges from other <tt>Segmen
he <tt>Segment</tt> ts</tt>. The <tt>Segment</tt>
referenced by the Ordered Chapter via the <tt>ChapterSegmentUUID Element</tt> <b referenced by the <tt>Ordered Chapter</tt> via the <tt>ChapterSegmentUUID Elemen
cp14>SHOULD</bcp14> be played as t</tt> <bcp14>SHOULD</bcp14> be played as
part of a Linked Segment.</t> part of a <tt>Linked Segment</tt>.</t>
<t>The timestamps of Segment content referenced by Ordered Chapters <t>The timestamps of <tt>Segment</tt> content referenced by <tt>Ordered Chapters
<bcp14>MUST</bcp14> be adjusted according to the cumulative duration of the prev </tt>
ious Ordered Chapters.</t> <bcp14>MUST</bcp14> be adjusted according to the cumulative duration of the prev
<t>As an example a file named <tt>intro.mkv</tt> could have a <tt>SegmentUUID</t ious <tt>Ordered Chapters</tt>.</t>
t> of &quot;0xb16a58609fc7e60653a60c984fc11ead&quot;. <t>As an example, a file named <tt>intro.mkv</tt> could have a <tt>SegmentUUID</
Another file called <tt>program.mkv</tt> could use a Chapter Edition that contai tt> of "0xb16a58609fc7e60653a60c984fc11ead".
ns two Ordered Chapters. Another file called <tt>program.mkv</tt> could use a <tt>Chapter Edition</tt> th
at contains two <tt>Ordered Chapters</tt>.
The first chapter references the <tt>Segment</tt> of <tt>intro.mkv</tt> with the use of a <tt>ChapterSegmentUUID</tt>, The first chapter references the <tt>Segment</tt> of <tt>intro.mkv</tt> with the use of a <tt>ChapterSegmentUUID</tt>,
<tt>ChapterSegmentEditionUID</tt>, <tt>ChapterTimeStart</tt>, and optionally a < <tt>ChapterSegmentEditionUID</tt>, <tt>ChapterTimeStart</tt>, and an optional <t
tt>ChapterTimeEnd</tt> element. t>ChapterTimeEnd</tt> element.
The second chapter references content within the <tt>Segment</tt> of <tt>program The second chapter references content within the <tt>Segment</tt> of <tt>program
.mkv</tt>. A <tt>Matroska Player</tt> .mkv</tt>. A Matroska Player
<bcp14>SHOULD</bcp14> recognize the <tt>Linked Segment</tt> created by the use o f <tt>ChapterSegmentUUID</tt> in an enabled <bcp14>SHOULD</bcp14> recognize the <tt>Linked Segment</tt> created by the use o f <tt>ChapterSegmentUUID</tt> in an enabled
<tt>Edition</tt> and present the reference content of the two <tt>Segments</tt> as a single presentation.</t> <tt>Edition</tt> and present the reference content of the two <tt>Segments</tt> as a single presentation.</t>
<t>The <tt>ChapterSegmentUUID</tt> represents the Segment that holds the content to play in place of the <tt>Linked Chapter</tt>. <t>The <tt>ChapterSegmentUUID</tt> represents the <tt>Segment</tt> that holds th e content to play in place of the <tt>Linked Chapter</tt>.
The <tt>ChapterSegmentUUID</tt> <bcp14>MUST NOT</bcp14> be the <tt>SegmentUUID</ tt> of its own <tt>Segment</tt>.</t> The <tt>ChapterSegmentUUID</tt> <bcp14>MUST NOT</bcp14> be the <tt>SegmentUUID</ tt> of its own <tt>Segment</tt>.</t>
<t>There are 2 ways to use a chapter link:</t>
<t>There are two ways to use a chapter link:</t>
<ul> <ul>
<li><t>Linked-Duration linking,</t> <li><t>Linked-Duration linking</t>
</li> </li>
<li><t>Linked-Edition linking</t> <li><t>Linked-Edition linking</t>
</li> </li>
</ul> </ul>
<section anchor="linked-duration"><name>Linked-Duration</name> <section anchor="linked-duration"><name>Linked-Duration</name>
<t>A <tt>Matroska Player</tt> <bcp14>MUST</bcp14> play the content of the linked <t>A Matroska Player <bcp14>MUST</bcp14> play the content of the <tt>Linked Segm
Segment ent</tt>
from the <tt>ChapterTimeStart</tt> until <tt>ChapterTimeEnd</tt> timestamp in pl from the <tt>ChapterTimeStart</tt> until the <tt>ChapterTimeEnd</tt> timestamp i
ace of the <tt>Linked Chapter</tt>.</t> n place of the <tt>Linked Chapter</tt>.</t>
<t><tt>ChapterTimeStart</tt> and <tt>ChapterTimeEnd</tt> represent timestamps in <t><tt>ChapterTimeStart</tt> and <tt>ChapterTimeEnd</tt> represent timestamps in
the Linked Segment matching the value of <tt>ChapterSegmentUUID</tt>. the <tt>Linked Segment</tt> matching the value of <tt>ChapterSegmentUUID</tt>.
Their values <bcp14>MUST</bcp14> be in the range of the linked Segment duration. Their values <bcp14>MUST</bcp14> be in the range of the <tt>Linked Segment</tt>
</t> duration.</t>
<t>The <tt>ChapterTimeEnd</tt> value <bcp14>MUST</bcp14> be set when using linke <t>The <tt>ChapterTimeEnd</tt> value <bcp14>MUST</bcp14> be set when using Linke
d-duration chapter linking. d-Duration chapter linking.
<tt>ChapterSegmentEditionUID</tt> <bcp14>MUST NOT</bcp14> be set.</t> <tt>ChapterSegmentEditionUID</tt> <bcp14>MUST NOT</bcp14> be set.</t>
</section> </section>
<section anchor="linked-edition"><name>Linked-Edition</name> <section anchor="linked-edition"><name>Linked-Edition</name>
<t>A <tt>Matroska Player</tt> <bcp14>MUST</bcp14> play the whole linked <tt>Edit <t>A Matroska Player <bcp14>MUST</bcp14> play the whole Linked <tt>Edition</tt>
ion</tt> of the linked Segment in place of the <tt>Linked Chapter</tt>.</t> of the <tt>Linked Segment</tt> in place of the <tt>Linked Chapter</tt>.</t>
<t><tt>ChapterSegmentEditionUID</tt> represents a valid Edition from the Linked <t><tt>ChapterSegmentEditionUID</tt> represents a valid <tt>Edition</tt> from th
Segment matching the value of <tt>ChapterSegmentUUID</tt>.</t> e <tt>Linked Segment</tt> matching the value of <tt>ChapterSegmentUUID</tt>.</t>
<t>When using linked-edition chapter linking. <tt>ChapterTimeEnd</tt> is <bcp14> <t>When using Linked-Edition chapter linking, <tt>ChapterTimeEnd</tt> is <bcp14>
OPTIONAL</bcp14>.</t> OPTIONAL</bcp14>.</t>
</section> </section>
</section> </section>
</section> </section>
<section anchor="track-flags"><name>Track Flags</name> <section anchor="track-flags"><name>Track Flags</name>
<section anchor="default-flag"><name>Default flag</name> <section anchor="default-flag"><name>Default Flag</name>
<t>The &quot;default track&quot; flag is a hint for a <tt>Matroska Player</tt> i <t>The Default flag is a hint for a Matroska Player indicating that a given trac
ndicating that a given track k
<bcp14>SHOULD</bcp14> be eligible to be automatically selected as the default tr ack for a given <bcp14>SHOULD</bcp14> be eligible to be automatically selected as the default tr ack for a given
language. If no tracks in a given language have the default track flag set, then all tracks language. If no tracks in a given language have the Default flag set, then all t racks
in that language are eligible for automatic selection. This can be used to indic ate that in that language are eligible for automatic selection. This can be used to indic ate that
a track provides &quot;regular service&quot; suitable for users with default set a track provides "regular service" that is suitable for users with default setti
tings, as opposed to ngs, as opposed to
specialized services, such as commentary, hearing-impaired captions, or descript specialized services, such as commentary, captions for users with hearing impair
ive audio.</t> ments, or descriptive audio.</t>
<t>The <tt>Matroska Player</tt> <bcp14>MAY</bcp14> override the &quot;default tr <t>The Matroska Player <bcp14>MAY</bcp14> override the Default flag for any reas
ack&quot; flag for any reason, including on, including
user preferences to prefer tracks providing accessibility services.</t> user preferences to prefer tracks providing accessibility services.</t>
</section> </section>
<section anchor="forced-flag"><name>Forced flag</name> <section anchor="forced-flag"><name>Forced Flag</name>
<t>The &quot;forced&quot; flag tells the <tt>Matroska Player</tt> that it <bcp14 <t>The Forced flag tells the Matroska Player that it <bcp14>SHOULD</bcp14> displ
>SHOULD</bcp14> display this subtitle track, ay this subtitle track,
even if user preferences usually would not call for any subtitles to be displaye d alongside even if user preferences usually would not call for any subtitles to be displaye d alongside
the current selected audio track. This can be used to indicate that a track cont the audio track that is currently selected. This can be used to indicate that a
ains translations track contains translations
of onscreen text, or of dialogue spoken in a different language than the track's of on-screen text or dialogue spoken in a different language than the track's pr
primary one.</t> imary language.</t>
</section> </section>
<section anchor="hearing-impaired-flag"><name>Hearing-impaired flag</name> <section anchor="hearing-impaired-flag"><name>Hearing-Impaired Flag</name>
<t>The &quot;hearing impaired&quot; flag tells the <tt>Matroska Player</tt> that <t>The Hearing-Impaired flag tells the Matroska Player that it <bcp14>SHOULD</bc
it <bcp14>SHOULD</bcp14> prefer this track p14> prefer this track
when selecting a default track for a hearing-impaired user, and that it <bcp14>M when selecting a default track for a user with a hearing impairment and that it
AY</bcp14> prefer to select <bcp14>MAY</bcp14> prefer to select
a different track when selecting a default track for a non-hearing-impaired user a different track when selecting a default track for a user that is not hearing
.</t> impaired.</t>
</section> </section>
<section anchor="visual-impaired-flag"><name>Visual-impaired flag</name> <section anchor="visual-impaired-flag"><name>Visual-Impaired Flag</name>
<t>The &quot;visual impaired&quot; flag tells the <tt>Matroska Player</tt> that
it <bcp14>SHOULD</bcp14> prefer this track <t>The Visual-Impaired flag tells the Matroska Player that it <bcp14>SHOULD</bcp
when selecting a default track for a visually-impaired user, and that it <bcp14> 14> prefer this track
MAY</bcp14> prefer to select when selecting a default track for a user with a visual impairment and that it <
a different track when selecting a default track for a non-visually-impaired use bcp14>MAY</bcp14> prefer to select
r.</t> a different track when selecting a default track for a user that is not visually
impaired.</t>
</section> </section>
<section anchor="descriptions-flag"><name>Descriptions flag</name> <section anchor="descriptions-flag"><name>Descriptions Flag</name>
<t>The &quot;descriptions&quot; flag tells the <tt>Matroska Player</tt> that thi <t>The Descriptions flag tells the Matroska Player that this track
s track is suitable to play via is suitable to play via a text-to-speech system for a user with a visual impairm
a text-to-speech system for a visually-impaired user, and that it <bcp14>SHOULD ent
NOT</bcp14> automatically and that it <bcp14>SHOULD NOT</bcp14> automatically select this track when
select this track when selecting a default track for a non-visually-impaired use selecting a default track for a user that is not visually impaired.</t>
r.</t>
</section> </section>
<section anchor="original-flag"><name>Original flag</name> <section anchor="original-flag"><name>Original Flag</name>
<t>The &quot;original&quot; flag tells the <tt>Matroska Player</tt> that this tr <t>The Original flag tells the Matroska Player that this track is in the
ack is in the original language, original language and that it <bcp14>SHOULD</bcp14> prefer this track if
and that it <bcp14>SHOULD</bcp14> prefer it if configured to prefer original-lan configured to prefer original-language tracks of this track's type.</t>
guage tracks of this
track's type.</t>
</section> </section>
<section anchor="commentary-flag"><name>Commentary flag</name> <section anchor="commentary-flag"><name>Commentary Flag</name>
<t>The &quot;commentary&quot; flag tells the <tt>Matroska Player</tt> that this <t>The Commentary flag tells the Matroska Player that this track contains commen
track contains commentary on tary on
the content.</t> the content.</t>
</section> </section>
<section anchor="track-operation"><name>Track Operation</name> <section anchor="track-operation"><name>Track Operation</name>
<t><tt>TrackOperation</tt> allows combining multiple tracks to make a virtual on <t><tt>TrackOperation</tt> allows for the combination of multiple tracks to make
e. It uses a virtual one. It uses
two separate system to combine tracks. One to create a 3D &quot;composition&quot two separate system to combine tracks. One to create a 3D "composition" (left/ri
; (left/right/background planes) ght/background planes)
and one to simplify join two tracks together to make a single track.</t> and one to simplify join two tracks together to make a single track.</t>
<t>A track created with <tt>TrackOperation</tt> is a proper track with a UID and all its flags. <t>A track created with <tt>TrackOperation</tt> is a proper track with a UID and all its flags.
However, the codec ID is meaningless because each &quot;sub&quot; track needs to However, the codec ID is meaningless because each "sub" track needs to be decode
be decoded by its d by its
own decoder before the &quot;operation&quot; is applied. The <tt>Cues Elements</ own decoder before the "operation" is applied. The <tt>Cues Elements</tt> corres
tt> corresponding to such ponding to such
a virtual track <bcp14>SHOULD</bcp14> be the union of the <tt>Cues Elements</tt> for each of the tracks it's composed of (when the <tt>Cues</tt> are defined per track).</t> a virtual track <bcp14>SHOULD</bcp14> be the union of the <tt>Cues Elements</tt> for each of the tracks it's composed of (when the <tt>Cues</tt> are defined per track).</t>
<t>In the case of <tt>TrackJoinBlocks</tt>, the <tt>Block Elements</tt> (from <t t>BlockGroup</tt> and <tt>SimpleBlock</tt>) <t>In the case of <tt>TrackJoinBlocks</tt>, the <tt>Block Elements</tt> (from <t t>BlockGroup</tt> and <tt>SimpleBlock</tt>)
of all the tracks <bcp14>SHOULD</bcp14> be used as if they were defined for this new virtual <tt>Track</tt>. of all the tracks <bcp14>SHOULD</bcp14> be used as if they were defined for this new virtual <tt>Track</tt>.
When two <tt>Block Elements</tt> have overlapping start or end timestamps, it's up to the underlying When two <tt>Block Elements</tt> have overlapping start or end timestamps, it's up to the underlying
system to either drop some of these frames or render them the way they overlap. system to either drop some of these frames or render them the way they overlap.
This situation <bcp14>SHOULD</bcp14> be avoided when creating such tracks as you can never be sure This situation <bcp14>SHOULD</bcp14> be avoided when creating such tracks, as yo u can never be sure
of the end result on different platforms.</t> of the end result on different platforms.</t>
</section> </section>
<section anchor="overlay-track"><name>Overlay Track</name> <section anchor="overlay-track"><name>Overlay Track</name>
<t>Overlay tracks <bcp14>SHOULD</bcp14> be rendered in the same channel as the t
rack it's linked to. <t>An overlay track <bcp14>SHOULD</bcp14> be rendered in the same channel as the
track it's linked to.
When content is found in such a track, it <bcp14>SHOULD</bcp14> be played on the rendering channel When content is found in such a track, it <bcp14>SHOULD</bcp14> be played on the rendering channel
instead of the original track.</t> instead of the original track.</t>
</section> </section>
<section anchor="multi-planar-and-3d-videos"><name>Multi-planar and 3D videos</n ame> <section anchor="multi-planar-and-3d-videos"><name>Multi-planar and 3D Videos</n ame>
<t>There are two different ways to compress 3D videos: have each eye track in a separate track <t>There are two different ways to compress 3D videos: have each eye track in a separate track
and have one track have both eyes combined inside (which is more efficient, comp ression-wise). and have one track have both eyes combined inside (which is more efficient compr ession-wise).
Matroska supports both ways.</t> Matroska supports both ways.</t>
<t>For the single track variant, there is the <tt>StereoMode Element</tt>, which <t>For the single-track variant, there is the <tt>StereoMode Element</tt>, which
defines how planes are defines how planes are
assembled in the track (mono or left-right combined). Odd values of StereoMode m assembled in the track (mono or left-right combined). Odd values of <tt>StereoMo
eans the left de</tt> means the left
plane comes first for more convenient reading. The pixel count of the track (<tt >PixelWidth</tt>/<tt>PixelHeight</tt>) plane comes first for more convenient reading. The pixel count of the track (<tt >PixelWidth</tt>/<tt>PixelHeight</tt>)
is the raw amount of pixels, for example 3840x1080 for full HD side by side, and is the raw number of pixels (for example, 3840x1080 for full HD side by side), a
the <tt>DisplayWidth</tt>/<tt>DisplayHeight</tt> nd the
in pixels is the amount of pixels for one plane (1920x1080 for that full HD stre <tt>DisplayWidth</tt>/<tt>DisplayHeight</tt>
am). in pixels is the number of pixels for one plane (1920x1080 for that full HD stre
Old stereo 3D were displayed using anaglyph (cyan and red colors separated). am).
For compatibility with such movies, there is a value of the StereoMode that corr
esponds to AnaGlyph.</t> Old stereo 3D movies were displayed using anaglyph (cyan and red colors separate
<t>There is also a &quot;packed&quot; mode (values 13 and 14) which consists of d).
packing two frames together For compatibility with such movies, there is a value of the <tt>StereoMode</tt>
in a <tt>Block</tt> using lacing. The first frame is the left eye and the other that corresponds to anaglyph.</t>
frame is the right eye <t>There is also a "packed" mode (values 13 and 14) that consists of packing two
frames together
in a <tt>Block</tt> that uses lacing. The first frame is the left eye and the ot
her frame is the right eye
(or vice versa). The frames <bcp14>SHOULD</bcp14> be decoded in that order and a re possibly dependent (or vice versa). The frames <bcp14>SHOULD</bcp14> be decoded in that order and a re possibly dependent
on each other (P and B frames).</t> on each other (P and B frames).</t>
<t>For separate tracks, Matroska needs to define exactly which track does what. <t>For separate tracks, Matroska needs to define exactly which track does what.
<tt>TrackOperation</tt> with <tt>TrackCombinePlanes</tt> do that. For more detai <tt>TrackOperation</tt> with <tt>TrackCombinePlanes</tt> does that. For more det
ls look at ails, see
<xref target="track-operation"></xref> on how TrackOperation works.</t> <xref target="track-operation"></xref> on how <tt>TrackOperation</tt> works.</t>
<t>The 3D support is still in infancy and may evolve to support more features.</ t> <t>The 3D support is still in infancy and may evolve to support more features.</ t>
<t>The StereoMode used to be part of Matroska v2 but it didn't meet the requirem <t>The <tt>StereoMode</tt> used to be part of Matroska v2, but it didn't meet th
ent e
for multiple tracks. There was also a bug in libmatroska prior to 0.9.0 that wou requirement for multiple tracks. There was also a bug in <xref
ld save/read target="libmatroska"></xref> prior to 0.9.0 that would save/read it as
it as <tt>0x53B9</tt> instead of <tt>0x53B8</tt>; see OldStereoMode (<xref targe <tt>0x53B9</tt> instead of <tt>0x53B8</tt>; see <tt>OldStereoMode</tt> (<xref
t="oldstereomode-element"></xref>). <tt>Matroska Readers</tt> <bcp14>MAY</bcp14> target="oldstereomode-element"></xref>). <tt>Matroska Readers</tt>
support these legacy files by checking <bcp14>MAY</bcp14> support these legacy files by checking Matroska v2 or
Matroska v2 or <tt>0x53B9</tt>. <tt>0x53B9</tt>. The older values of <tt>StereoMode</tt> were 0 (mono), 1 (righ
The older values of StereoMode were 0: mono, 1: right eye, 2: left eye, 3: both t eye),
eyes, the only values that can be found in OldStereoMode. 2 (left eye), and 3 (both eyes); these are the only values that can be found
They are not compatible with the StereoMode values found in Matroska v3 and abov in <tt>OldStereoMode</tt>. They are not compatible with the <tt>StereoMode</tt>
e.</t> values found in
Matroska v3 and above.</t>
</section> </section>
</section> </section>
<section anchor="default-track-selection"><name>Default track selection</name> <section anchor="default-track-selection"><name>Default Track Selection</name>
<t>This section provides some example sets of Tracks and hypothetical user setti <t>This section provides some example sets of <tt>Tracks</tt> and hypothetical u
ngs, along with ser settings, along with
indications of which ones a similarly-configured <tt>Matroska Player</tt> <bcp14 indications of which ones a similarly configured Matroska Player <bcp14>SHOULD</
>SHOULD</bcp14> automatically bcp14> automatically
select for playback by default in such a situation. A player <bcp14>MAY</bcp14> provide additional settings select for playback by default in such a situation. A player <bcp14>MAY</bcp14> provide additional settings
with more detailed controls for more nuanced scenarios. These examples are provi ded as guidelines with more detailed controls for more nuanced scenarios. These examples are provi ded as guidelines
to illustrate the intended usages of the various supported Track flags, and thei r expected behaviors.</t> to illustrate the intended usages of the various supported Track flags and their expected behaviors.</t>
<t>Track names are shown in English for illustrative purposes; actual files may have titles <t>Track names are shown in English for illustrative purposes; actual files may have titles
in the language of each track, or provide titles in multiple languages.</t> in the language of each track or provide titles in multiple languages.</t>
<section anchor="audio-selection"><name>Audio Selection</name> <section anchor="audio-selection"><name>Audio Selection</name>
<t>Example track set:</t> <t>Example track set:</t>
<table anchor="audioTrackSelection"><name>Audio Tracks for default selection</na me> <table anchor="audioTrackSelection"><name>Audio Tracks for Default Selection</na me>
<thead> <thead>
<tr> <tr>
<th>No.</th> <th>No.</th>
<th>Type</th> <th>Type</th>
<th>Lang</th> <th>Lang</th>
<th>Layout</th> <th>Layout</th>
<th>Original</th> <th>Original</th>
<th>Default</th> <th>Default</th>
<th>Other flags</th> <th>Other Flags</th>
<th>Name</th> <th>Name</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td>1</td> <td>1</td>
<td>Video</td> <td>Video</td>
<td>und</td> <td>und</td>
<td>N/A</td> <td>N/A</td>
skipping to change at line 6548 skipping to change at line 6792
<td></td> <td></td>
</tr> </tr>
<tr> <tr>
<td>4</td> <td>4</td>
<td>Audio</td> <td>Audio</td>
<td>eng</td> <td>eng</td>
<td>2.0</td> <td>2.0</td>
<td>1</td> <td>1</td>
<td>0</td> <td>0</td>
<td>Visual-impaired</td> <td>Visual-Impaired</td>
<td>Descriptive audio</td> <td>Descriptive audio</td>
</tr> </tr>
<tr> <tr>
<td>5</td> <td>5</td>
<td>Audio</td> <td>Audio</td>
<td>esp</td> <td>esp</td>
<td>5.1</td> <td>5.1</td>
<td>0</td> <td>0</td>
<td>1</td> <td>1</td>
skipping to change at line 6570 skipping to change at line 6814
<td></td> <td></td>
</tr> </tr>
<tr> <tr>
<td>6</td> <td>6</td>
<td>Audio</td> <td>Audio</td>
<td>esp</td> <td>esp</td>
<td>2.0</td> <td>2.0</td>
<td>0</td> <td>0</td>
<td>0</td> <td>0</td>
<td>Visual-impaired</td> <td>Visual-Impaired</td>
<td>Descriptive audio</td> <td>Descriptive audio</td>
</tr> </tr>
<tr> <tr>
<td>7</td> <td>7</td>
<td>Audio</td> <td>Audio</td>
<td>eng</td> <td>eng</td>
<td>2.0</td> <td>2.0</td>
<td>1</td> <td>1</td>
<td>0</td> <td>0</td>
skipping to change at line 6596 skipping to change at line 6840
<td>8</td> <td>8</td>
<td>Audio</td> <td>Audio</td>
<td>eng</td> <td>eng</td>
<td>2.0</td> <td>2.0</td>
<td>1</td> <td>1</td>
<td>0</td> <td>0</td>
<td>None</td> <td>None</td>
<td>Karaoke</td> <td>Karaoke</td>
</tr> </tr>
</tbody> </tbody>
</table><t>Here we have a file with 7 audio tracks, of which 5 are in English an d 2 are in Spanish.</t> </table><t>The table above shows a file with seven audio tracks -- five in Engli sh and two in Spanish.</t>
<t>The English tracks all have the Original flag, indicating that English is the original content language.</t> <t>The English tracks all have the Original flag, indicating that English is the original content language.</t>
<t>Generally the player will first consider the track languages: if the player h <t>Generally, the player will first consider the track languages. If the player
as an option to prefer has an option to prefer
original-language audio and the user has enabled it, then it should prefer one o original-language audio and the user has enabled it, then it should prefer one o
f the Original-flagged tracks. f the tracks with the Original flag.
If configured to specifically prefer audio tracks in English or Spanish, the pla If the user has configured to specifically prefer audio tracks in English or
yer should select one of Spanish, the player should select one of the tracks in the corresponding
the tracks in the corresponding language. The player may also wish to prefer an language. The player may also wish to prefer a track with the Original flag if
Original-flagged track no tracks matching any of the user's explicitly preferred languages are
if no tracks matching any of the user's explicitly-preferred languages are avail available.</t>
able.</t> <t>Two of the tracks have the Visual-Impaired flag. If the player has been confi
<t>Two of the tracks have the Visual-impaired flag. If the player has been confi gured to prefer such tracks,
gured to prefer such tracks,
it should select one; otherwise, it should avoid them if possible.</t> it should select one; otherwise, it should avoid them if possible.</t>
<t>If selecting an English track, when other settings have left multiple possibl e options, <t>If selecting an English track, when other settings have left multiple possibl e options,
it may be useful to exclude the tracks that lack the Default flag: here, one pro it may be useful to exclude the tracks that lack the Default flag. Here, one pro
vides descriptive service for vides descriptive service for
the visually impaired (which has its own flag and may be automatically selected individuals with visual impairments (which has its own flag and may be automatic
by user configuration, ally selected by user configuration
but is unsuitable for users with default-configured players), one is a commentar y track but is unsuitable for users with default-configured players), one is a commentar y track
(which has its own flag, which the player may or may not have specialized handli (which has its own flag and the player may or may not have specialized handling
ng for), for),
and the last contains karaoke versions of the music that plays during the film, and the last contains karaoke versions of the music that plays during the film (
which is an unusual which is an unusual
specialized audio service that Matroska has no built-in support for indicating, so it's indicated specialized audio service that Matroska has no built-in support for indicating, so it's indicated
in the track name instead. By not setting the Default flag on these specialized tracks, the file's author in the track name instead). By not setting the Default flag on these specialized tracks, the file's author
hints that they should not be automatically selected by a default-configured pla yer.</t> hints that they should not be automatically selected by a default-configured pla yer.</t>
<t>Having narrowed its choices down, our example player now may have to select b etween tracks 2 and 3. <t>Having narrowed its choices down, the example player now may have to select b etween tracks 2 and 3.
The only difference between these tracks is their channel layouts: 2 is 5.1 surr ound, while 3 is stereo. The only difference between these tracks is their channel layouts: 2 is 5.1 surr ound, while 3 is stereo.
If the player is aware that the output device is a pair of headphones or stereo speakers, it may wish If the player is aware that the output device is a pair of headphones or stereo speakers, it may wish
to prefer the stereo mix automatically. On the other hand, if it knows that the device is a surround system, to prefer the stereo mix automatically. On the other hand, if it knows that the device is a surround system,
it may wish to prefer the surround mix.</t> it may wish to prefer the surround mix.</t>
<t>If the player finishes analyzing all of the available audio tracks and finds that multiple seems equally <t>If the player finishes analyzing all of the available audio tracks and finds that more than one seem equally
and maximally preferable, it <bcp14>SHOULD</bcp14> default to the first of the g roup.</t> and maximally preferable, it <bcp14>SHOULD</bcp14> default to the first of the g roup.</t>
</section> </section>
<section anchor="subtitle-selection"><name>Subtitle selection</name> <section anchor="subtitle-selection"><name>Subtitle Selection</name>
<t>Example track set:</t> <t>Example track set:</t>
<table anchor="subtitleTrackSelection"><name>Subtitle Tracks for default selecti on</name> <table anchor="subtitleTrackSelection"><name>Subtitle Tracks for Default Selecti on</name>
<thead> <thead>
<tr> <tr>
<th>No.</th> <th>No.</th>
<th>Type</th> <th>Type</th>
<th>Lang</th> <th>Lang</th>
<th>Original</th> <th>Original</th>
<th>Default</th> <th>Default</th>
<th>Forced</th> <th>Forced</th>
<th>Other flags</th> <th>Other Flags</th>
<th>Name</th> <th>Name</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td>1</td> <td>1</td>
<td>Video</td> <td>Video</td>
<td>und</td> <td>und</td>
<td>N/A</td> <td>N/A</td>
skipping to change at line 6691 skipping to change at line 6937
<td></td> <td></td>
</tr> </tr>
<tr> <tr>
<td>5</td> <td>5</td>
<td>Subtitles</td> <td>Subtitles</td>
<td>fra</td> <td>fra</td>
<td>1</td> <td>1</td>
<td>0</td> <td>0</td>
<td>0</td> <td>0</td>
<td>Hearing-impaired</td> <td>Hearing-Impaired</td>
<td>Captions for the hearing-impaired</td> <td>Captions for users with hearing impairments</td>
</tr> </tr>
<tr> <tr>
<td>6</td> <td>6</td>
<td>Subtitles</td> <td>Subtitles</td>
<td>por</td> <td>por</td>
<td>0</td> <td>0</td>
<td>1</td> <td>1</td>
<td>0</td> <td>0</td>
<td>None</td> <td>None</td>
skipping to change at line 6724 skipping to change at line 6970
<td>Signs</td> <td>Signs</td>
</tr> </tr>
<tr> <tr>
<td>8</td> <td>8</td>
<td>Subtitles</td> <td>Subtitles</td>
<td>por</td> <td>por</td>
<td>0</td> <td>0</td>
<td>0</td> <td>0</td>
<td>0</td> <td>0</td>
<td>Hearing-impaired</td> <td>Hearing-Impaired</td>
<td>SDH</td> <td>SDH</td>
</tr> </tr>
</tbody> </tbody>
</table><t>Here we have 2 audio tracks and 5 subtitle tracks. As we can see, Fre </table><t>The table above shows two audio tracks and five subtitle tracks. As w
nch is the original language.</t> e can see, French is the original language.</t>
<t>We'll start by discussing the case where the user prefers French (or Original <t>We'll start by discussing the case where the user prefers French (or original
-language) -language)
audio (or has explicitly selected the French audio track), and also prefers Fren audio (or has explicitly selected the French audio track) and also prefers Frenc
ch subtitles.</t> h subtitles.</t>
<t>In this case, if the player isn't configured to display captions when the aud io matches their <t>In this case, if the player isn't configured to display captions when the aud io matches their
preferred subtitle languages, the player doesn't need to select a subtitle track at all.</t> preferred subtitle languages, the player doesn't need to select a subtitle track at all.</t>
<t>If the user <em>has</em> indicated that they want captions to be displayed, t he selection simply <t>If the user <em>has</em> indicated that they want captions to be displayed, t he selection simply
comes down to whether Hearing-impaired subtitles are preferred.</t> comes down to whether hearing-impaired subtitles are preferred.</t>
<t>The situation for a user who prefers Portuguese subtitles starts out somewhat analogous. <t>The situation for a user who prefers Portuguese subtitles starts out somewhat analogous.
If they select the original French audio (either by explicit audio language pref erence, If they select the original French audio (either by explicit audio language pref erence,
preference for Original-language tracks, or by explicitly selecting that track), then the preference for original-language tracks, or explicitly selecting that track), th en the
selection once again comes down to the hearing-impaired preference.</t> selection once again comes down to the hearing-impaired preference.</t>
<t>However, the case where the Portuguese audio track is selected has an importa nt catch: <t>However, the case where the Portuguese audio track is selected has an importa nt catch:
a Forced track in Portuguese is present. This may contain translations of onscre a Forced track in Portuguese is present. This may contain translations of on-scr
en text een text
from the video track, or of portions of the audio that are not translated (music from the video track or of portions of the audio that are not translated (music,
, for instance). for instance).
This means that even if the user's preferences wouldn't normally call for captio ns here, This means that even if the user's preferences wouldn't normally call for captio ns here,
the Forced track should be selected nonetheless, rather than selecting no track at all. the Forced track should be selected nonetheless, rather than selecting no track at all.
On the other hand, if the user's preferences <em>do</em> call for captions, the non-Forced tracks On the other hand, if the user's preferences <em>do</em> call for captions, the non-Forced tracks
should be preferred, as the Forced track will not contain captioning for the dia logue.</t> should be preferred, as the Forced track will not contain captioning for the dia logue.</t>
</section> </section>
</section> </section>
<section anchor="chapters"><name>Chapters</name> <section anchor="chapters"><name>Chapters</name>
<t>The Matroska Chapters system can have multiple <tt>Editions</tt> and each <tt <t>The Matroska <tt>Chapters</tt> system can have multiple <tt>Editions</tt>, an
>Edition</tt> can consist of d each <tt>Edition</tt> can consist of
<tt>Simple Chapters</tt> where a chapter start time is used as marker in the tim <tt>Simple Chapters</tt> where a chapter start time is used as a marker in the t
eline only. An imeline only. An
<tt>Edition</tt> can be more complex with <tt>Ordered Chapters</tt> where a chap <tt>Edition</tt> can be more complex with <tt>Ordered Chapters</tt> where a chap
ter end time stamp is additionally ter end timestamp is additionally
used or much more complex with <tt>Linked Chapters</tt>. The Matroska Chapters s used or much more complex with <tt>Linked Chapters</tt>. The Matroska <tt>Chapte
ystem can also have a menu rs</tt> system can also have a menu
structure, borrowed from the DVD menu system <xref target="DVD-Video"></xref>, o structure borrowed from the DVD-menu system <xref target="DVD-Video"></xref> or
r have its own built-in Matroska menu structure.</t> have its own built-in Matroska menu structure.</t>
<section anchor="editionentry"><name>EditionEntry</name> <section anchor="editionentry"><name>EditionEntry</name>
<t>The <tt>EditionEntry</tt> is also called an <tt>Edition</tt>. <t>The <tt>EditionEntry</tt> is also called an <tt>Edition</tt>.
An <tt>Edition</tt> contains a set of <tt>Edition</tt> flags and <bcp14>MUST</bc p14> contain at least one <tt>ChapterAtom Element</tt>. An <tt>Edition</tt> contains a set of <tt>Edition</tt> flags and <bcp14>MUST</bc p14> contain at least one <tt>ChapterAtom Element</tt>.
Chapters are always inside an <tt>Edition</tt> (or a Chapter itself part of an < <tt>Chapters</tt> are always inside an <tt>Edition</tt> (or a <tt>Chapter</tt> i
tt>Edition</tt>). tself is part of an <tt>Edition</tt>).
Multiple Editions are allowed. Some of these Editions <bcp14>MAY</bcp14> be orde Multiple <tt>Editions</tt> are allowed. Some of these <tt>Editions</tt> <bcp14>M
red and others not.</t> AY</bcp14> be ordered and others not.</t>
<section anchor="editionflagdefault"><name>EditionFlagDefault</name> <section anchor="editionflagdefault"><name>EditionFlagDefault</name>
<t>Only one <tt>Edition</tt> <bcp14>SHOULD</bcp14> have an <tt>EditionFlagDefaul t</tt> flag set to <tt>true</tt>.</t> <t>Only one <tt>Edition</tt> <bcp14>SHOULD</bcp14> have an <tt>EditionFlagDefaul t</tt> flag set to <tt>true</tt>.</t>
</section> </section>
<section anchor="default-edition"><name>Default Edition</name> <section anchor="default-edition"><name>Default Edition</name>
<t>The <tt>Default Edition</tt> is the <tt>Edition</tt> that a <tt>Matroska Play er</tt> <bcp14>SHOULD</bcp14> use for playback by default.</t> <t>The <tt>Default Edition</tt> is the <tt>Edition</tt> that a Matroska Player < bcp14>SHOULD</bcp14> use for playback by default.</t>
<t>The first <tt>Edition</tt> with the <tt>EditionFlagDefault</tt> flag set to < tt>true</tt> is the <tt>Default Edition</tt>.</t> <t>The first <tt>Edition</tt> with the <tt>EditionFlagDefault</tt> flag set to < tt>true</tt> is the <tt>Default Edition</tt>.</t>
<t>When all <tt>EditionFlagDefault</tt> flags are set to <tt>false</tt>, then th e first <tt>Edition</tt> <t>When all <tt>EditionFlagDefault</tt> flags are set to <tt>false</tt>, then th e first <tt>Edition</tt>
is the <tt>Default Edition</tt>.</t> is the <tt>Default Edition</tt>.</t>
<table anchor="defaultEditionAllDefault"><name>Default edition, all default</nam e> <table anchor="defaultEditionAllDefault"><name>Default Edition, All Default</nam e>
<thead> <thead>
<tr> <tr>
<th align="left">Edition</th> <th align="left">Edition</th>
<th align="left">FlagDefault</th> <th align="left">FlagDefault</th>
<th align="left">Default Edition</th> <th align="left">Default Edition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 6799 skipping to change at line 7045
<td align="left">true</td> <td align="left">true</td>
<td align="left"></td> <td align="left"></td>
</tr> </tr>
<tr> <tr>
<td align="left">Edition 3</td> <td align="left">Edition 3</td>
<td align="left">true</td> <td align="left">true</td>
<td align="left"></td> <td align="left"></td>
</tr> </tr>
</tbody> </tbody>
</table><table anchor="defaultEditionNoDefault"><name>Default edition, no defaul t</name> </table><table anchor="defaultEditionNoDefault"><name>Default Edition, No Defaul t</name>
<thead> <thead>
<tr> <tr>
<th align="left">Edition</th> <th align="left">Edition</th>
<th align="left">FlagDefault</th> <th align="left">FlagDefault</th>
<th align="left">Default Edition</th> <th align="left">Default Edition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 6827 skipping to change at line 7073
<td align="left">false</td> <td align="left">false</td>
<td align="left"></td> <td align="left"></td>
</tr> </tr>
<tr> <tr>
<td align="left">Edition 3</td> <td align="left">Edition 3</td>
<td align="left">false</td> <td align="left">false</td>
<td align="left"></td> <td align="left"></td>
</tr> </tr>
</tbody> </tbody>
</table><table anchor="defaultEditionWithDefault"><name>Default edition, with de fault</name> </table><table anchor="defaultEditionWithDefault"><name>Default Edition, With De fault</name>
<thead> <thead>
<tr> <tr>
<th align="left">Edition</th> <th align="left">Edition</th>
<th align="left">FlagDefault</th> <th align="left">FlagDefault</th>
<th align="left">Default Edition</th> <th align="left">Default Edition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 6858 skipping to change at line 7104
<tr> <tr>
<td align="left">Edition 3</td> <td align="left">Edition 3</td>
<td align="left">false</td> <td align="left">false</td>
<td align="left"></td> <td align="left"></td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
<section anchor="editionflagordered"><name>EditionFlagOrdered</name> <section anchor="editionflagordered"><name>EditionFlagOrdered</name>
<t>The <tt>EditionFlagOrdered Flag</tt> is a significant feature as it enables a <t>The <tt>EditionFlagOrdered</tt> flag is a significant feature, as it enables
n <tt>Edition</tt> an <tt>Edition</tt>
of <tt>Ordered Chapters</tt> which defines and arranges a virtual timeline rathe of <tt>Ordered Chapters</tt> that defines and arranges a virtual timeline rather
r than simply than simply
labeling points within the timeline. For example, with <tt>Editions</tt> of <tt> labeling points within the timeline. For example, with <tt>Editions</tt> of <tt>
Ordered Chapters</tt> Ordered Chapters</tt>,
a single <tt>Matroska file</tt> can present multiple edits of a film without dup licating content. a single <tt>Matroska file</tt> can present multiple edits of a film without dup licating content.
Alternatively, if a videotape is digitized in full, one <tt>Ordered Edition</tt> could present Alternatively, if a videotape is digitized in full, one <tt>Ordered Edition</tt> could present
the full content (including colorbars, countdown, slate, a feature presentation, and the full content (including colorbars, countdown, slate, a feature presentation, and
black frames), while another <tt>Edition</tt> of <tt>Ordered Chapters</tt> can u se <tt>Chapters</tt> that only black frames), while another <tt>Edition</tt> of <tt>Ordered Chapters</tt> can u se <tt>Chapters</tt> that only
mark the intended presentation with the colorbars and other ancillary visual inf ormation mark the intended presentation with the colorbars and other ancillary visual inf ormation
excluded. If an <tt>Edition</tt> of <tt>Ordered Chapters</tt> is enabled, then t excluded. If an <tt>Edition</tt> of <tt>Ordered Chapters</tt> is enabled, then t
he <tt>Matroska Player</tt> <bcp14>MUST</bcp14> he Matroska Player <bcp14>MUST</bcp14>
play those Chapters in their stored order from the timestamp marked in the play those <tt>Chapters</tt> in their stored order from the timestamp marked in
the
<tt>ChapterTimeStart Element</tt> to the timestamp marked in to <tt>ChapterTimeE nd Element</tt>.</t> <tt>ChapterTimeStart Element</tt> to the timestamp marked in to <tt>ChapterTimeE nd Element</tt>.</t>
<t>If the <tt>EditionFlagOrdered Flag</tt> evaluates to &quot;0&quot;, <tt>Simpl <t>If the <tt>EditionFlagOrdered</tt> flag evaluates to "0", <tt>Simple Chapters
e Chapters</tt> are used and </tt> are used and
only the <tt>ChapterTimeStart</tt> of a <tt>Chapter</tt> is used as chapter mark only the <tt>ChapterTimeStart</tt> of a <tt>Chapter</tt> is used as a chapter ma
to jump to the rk to jump to the
predefined point in the timeline. With <tt>Simple Chapters</tt>, a <tt>Matroska predefined point in the timeline. With <tt>Simple Chapters</tt>, a Matroska Play
Player</tt> <bcp14>MUST</bcp14> er <bcp14>MUST</bcp14>
ignore certain <tt>Chapter Elements</tt>. In that case these elements are inform ignore certain elements inside a <tt>Chapters Element</tt>. In that case, these
ational only.</t> elements are informational only.</t>
<t>The following list shows the different Chapter elements only found in <tt>Ord <t>The following list shows the different <tt>Chapters</tt> elements only found
ered Chapters</tt>.</t> in <tt>Ordered Chapters</tt>.</t>
<table anchor="orderedOnly"><name>elements only found in ordered chapters</name>
<thead>
<tr>
<th align="left">Ordered Chapter elements</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">ChapterAtom/ChapterSegmentUUID</td>
</tr>
<tr>
<td align="left">ChapterAtom/ChapterSegmentEditionUID</td>
</tr>
<tr>
<td align="left">ChapterAtom/ChapterTrack</td>
</tr>
<tr>
<td align="left">ChapterAtom/ChapProcess</td>
</tr>
<tr>
<td align="left">Info/ChapterTranslate</td>
</tr>
<tr>
<td align="left">TrackEntry/TrackTranslate</td>
</tr>
</tbody>
</table><t>Furthermore, there are other EBML <tt>Elements</tt> which could be us
ed if the <tt>EditionFlagOrdered</tt>
evaluates to &quot;1&quot;.</t>
<section anchor="ordered-edition-and-matroska-segment-linking"><name>Ordered-Edi
tion and Matroska Segment-Linking</name>
<ul> <ul>
<li><t>Hard Linking: <tt>Ordered-Chapters</tt> supersedes the <tt>Hard Linking</ <li><tt>ChapterAtom/ChapterSegmentUUID</tt></li>
tt>.</t> <li><tt>ChapterAtom/ChapterSegmentEditionUID</tt></li>
</li> <li><tt>ChapterAtom/ChapterTrack</tt></li>
<li><t>Medium Linking: <tt>Ordered Chapters</tt> are used in a normal way and ca <li><tt>ChapterAtom/ChapProcess</tt></li>
n be combined <li><tt>Info/ChapterTranslate</tt></li>
with the <tt>ChapterSegmentUUID</tt> element which establishes a link to another <li><tt>TrackEntry/TrackTranslate</tt></li>
Segment.</t>
</li>
</ul> </ul>
<t>See <xref target="linked-segments"></xref> on the Linked Segments for more in <t>Furthermore, there are other EBML <tt>Elements</tt> that could be used if the
formation <tt>EditionFlagOrdered</tt>
evaluates to "1".</t>
<section anchor="ordered-edition-and-matroska-segment-linking"><name>Ordered-Edi
tion and Matroska Segment Linking</name>
<dl>
<dt>Hard Linking:</dt><dd><tt>Ordered Chapters</tt> supersede the <tt>Hard Linki
ng</tt>.</dd>
<dt>Medium Linking:</dt><dd><tt>Ordered Chapters</tt> are used in a normal way a
nd can be combined
with the <tt>ChapterSegmentUUID</tt> element, which establishes a link to anothe
r <tt>Segment</tt>.</dd>
</dl>
<t>See <xref target="linked-segments"></xref> on <tt>Linked Segment</tt>s for mo
re information
about <tt>Hard Linking</tt> and <tt>Medium Linking</tt>.</t> about <tt>Hard Linking</tt> and <tt>Medium Linking</tt>.</t>
</section> </section>
</section> </section>
</section> </section>
<section anchor="chapteratom"><name>ChapterAtom</name> <section anchor="chapteratom"><name>ChapterAtom</name>
<t>The <tt>ChapterAtom</tt> is also called a <tt>Chapter</tt>.</t> <t>The <tt>ChapterAtom</tt> is also called a <tt>Chapter</tt>.</t>
<section anchor="chaptertimestart"><name>ChapterTimeStart</name> <section anchor="chaptertimestart"><name>ChapterTimeStart</name>
<t>The timestamp of the start of <tt>Chapter</tt> with nanosecond accuracy, not <t><tt>ChapterTimeStart</tt> is the timestamp of the start of <tt>Chapter</tt> w
scaled by TimestampScale. ith nanosecond accuracy and is not scaled by <tt>TimestampScale</tt>.
For <tt>Simple Chapters</tt> this is the position of the chapter markers in the For <tt>Simple Chapters</tt>, this is the position of the chapter markers in the
timeline.</t> timeline.</t>
</section> </section>
<section anchor="chaptertimeend"><name>ChapterTimeEnd</name> <section anchor="chaptertimeend"><name>ChapterTimeEnd</name>
<t>The timestamp of the end of <tt>Chapter</tt> with nanosecond accuracy, not sc aled by TimestampScale. <t><tt>ChapterTimeEnd</tt> is the timestamp of the end of <tt>Chapter</tt> with nanosecond accuracy and is not scaled by <tt>TimestampScale</tt>.
The timestamp defined by the <tt>ChapterTimeEnd</tt> is not part of the <tt>Chap ter</tt>. The timestamp defined by the <tt>ChapterTimeEnd</tt> is not part of the <tt>Chap ter</tt>.
A <tt>Matroska Player</tt> calculates the duration of this <tt>Chapter</tt> usin g the difference between the A Matroska Player calculates the duration of this <tt>Chapter</tt> using the dif ference between the
<tt>ChapterTimeEnd</tt> and <tt>ChapterTimeStart</tt>. <tt>ChapterTimeEnd</tt> and <tt>ChapterTimeStart</tt>.
The end timestamp <bcp14>MUST</bcp14> be greater than or equal to the start time stamp.</t> The end timestamp <bcp14>MUST</bcp14> be greater than or equal to the start time stamp.</t>
<t>When the <tt>ChapterTimeEnd</tt> timestamp is equal to the <tt>ChapterTimeSta rt</tt> timestamp, <t>When the <tt>ChapterTimeEnd</tt> timestamp is equal to the <tt>ChapterTimeSta rt</tt> timestamp,
the timestamps is included in the <tt>Chapter</tt>. It can be useful to put mark ers in the timestamp is included in the <tt>Chapter</tt>. It can be useful to put marke rs in
a file or add chapter commands with ordered chapter commands without having to p lay anything; a file or add chapter commands with ordered chapter commands without having to p lay anything;
see <xref target="chapprocess-element"></xref>.</t> see <xref target="chapprocess-element"></xref>.</t>
<table anchor="ChapterTimeEndUsage"><name>ChapterTimeEnd usage possibilities</na <table anchor="ChapterTimeEndUsage"><name>ChapterTimeEnd Usage
me> Possibilities</name>
<thead> <thead>
<tr> <tr>
<th align="left">Chapter</th> <th align="left">Chapter</th>
<th align="left">Start timestamp</th> <th align="left">Start timestamp</th>
<th align="left">End timestamp</th> <th align="left">End timestamp</th>
<th align="left">Duration</th> <th align="left">Duration</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
skipping to change at line 6985 skipping to change at line 7207
<td align="left">Chapter 4</td> <td align="left">Chapter 4</td>
<td align="left">9000000000</td> <td align="left">9000000000</td>
<td align="left">8000000000</td> <td align="left">8000000000</td>
<td align="left">Invalid (-1000000000)</td> <td align="left">Invalid (-1000000000)</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
<section anchor="nested-chapters"><name>Nested Chapters</name> <section anchor="nested-chapters"><name>Nested Chapters</name>
<t>A <tt>ChapterAtom</tt> element can contain other <tt>ChapterAtom</tt> element s. <t>A <tt>ChapterAtom</tt> element can contain other <tt>ChapterAtom</tt> element s.
That element is a <tt>Parent Chapter</tt> and the <tt>ChapterAtom</tt> elements That element is a <tt>Parent Chapter</tt>, and the <tt>ChapterAtom</tt> elements
it contains are <tt>Nested Chapters</tt>.</t> it contains are <tt>Nested Chapters</tt>.</t>
<t>Nested Chapters can be useful to tag small parts of a Segment that already ha <t><tt>Nested Chapters</tt> can be useful to tag small parts of a <tt>Segment</t
ve tags or t> that already have tags or
add Chapter Codec commands on smaller parts of a Segment that already have Chapt add Chapter Codec commands on smaller parts of a <tt>Segment</tt> that already h
er Codec commands.</t> ave Chapter Codec commands.</t>
<t>The <tt>ChapterTimeStart</tt> of a <tt>Nested Chapter</tt> <bcp14>MUST</bcp14 <t>The <tt>ChapterTimeStart</tt> of a <tt>Nested Chapter</tt> <bcp14>MUST</bcp14
> be greater than or equal to the <tt>ChapterTimeStart</tt> its <tt>Parent Chapt > be greater than or equal to the <tt>ChapterTimeStart</tt> of its <tt>Parent Ch
er</tt>.</t> apter</tt>.</t>
<t>If the <tt>Parent Chapter</tt> of a <tt>Nested Chapter</tt> has a <tt>Chapter TimeEnd</tt>, the <tt>ChapterTimeStart</tt> of that <tt>Nested Chapter</tt> <t>If the <tt>Parent Chapter</tt> of a <tt>Nested Chapter</tt> has a <tt>Chapter TimeEnd</tt>, the <tt>ChapterTimeStart</tt> of that <tt>Nested Chapter</tt>
<bcp14>MUST</bcp14> be smaller than or equal to the <tt>ChapterTimeEnd</tt> of t he <tt>Parent Chapter</tt>.</t> <bcp14>MUST</bcp14> be smaller than or equal to the <tt>ChapterTimeEnd</tt> of t he <tt>Parent Chapter</tt>.</t>
</section> </section>
<section anchor="nested-chapters-in-ordered-chapters"><name>Nested Chapters in O rdered Chapters</name> <section anchor="nested-chapters-in-ordered-chapters"><name>Nested Chapters in O rdered Chapters</name>
<t>The <tt>ChapterTimeEnd</tt> of the lowest level of <tt>Nested Chapters</tt> < <t>The <tt>ChapterTimeEnd</tt> of the lowest level of <tt>Nested Chapters</tt> <
bcp14>MUST</bcp14> be set for Ordered Chapters.</t> bcp14>MUST</bcp14> be set for <tt>Ordered Chapters</tt>.</t>
<t>When used with Ordered Chapters, the <tt>ChapterTimeEnd</tt> value of a <tt>P <t>When used with <tt>Ordered Chapters</tt>, the <tt>ChapterTimeEnd</tt> value o
arent Chapter</tt> is useless for playback f a <tt>Parent Chapter</tt> is useless for playback,
as the proper playback sections are described in its <tt>Nested Chapters</tt>. as the proper playback sections are described in its <tt>Nested Chapters</tt>.
The <tt>ChapterTimeEnd</tt> <bcp14>SHOULD NOT</bcp14> be set in <tt>Parent Chapt ers</tt> and <bcp14>MUST</bcp14> be ignored for playback.</t> The <tt>ChapterTimeEnd</tt> <bcp14>SHOULD NOT</bcp14> be set in <tt>Parent Chapt ers</tt> and <bcp14>MUST</bcp14> be ignored for playback.</t>
</section> </section>
<section anchor="chapterflaghidden"><name>ChapterFlagHidden</name> <section anchor="chapterflaghidden"><name>ChapterFlagHidden</name>
<t>Each Chapter <t> Each <tt>Chapter</tt>'s <tt>ChapterFlagHidden</tt> flag works independently
<tt>ChapterFlagHidden</tt> flag works independently of parent chapters. of <tt>Parent
A <tt>Nested Chapter</tt> with a <tt>ChapterFlagHidden</tt> that evaluates to &q Chapters</tt>. A <tt>Nested Chapter</tt> with a <tt>ChapterFlagHidden</tt> flag
uot;0&quot; remains visible in the user interface even if the that evaluates to
<tt>Parent Chapter</tt> <tt>ChapterFlagHidden</tt> flag is set to &quot;1&quot;. "0" remains visible in the user interface even if the <tt>Parent Chapter</tt>'s
</t> <tt>ChapterFlagHidden</tt> flag is set to "1".</t>
<table anchor="ChapterFlagHiddenNested"><name>ChapterFlagHidden nested visibilit
y</name> <table anchor="ChapterFlagHiddenNested"><name>ChapterFlagHidden Nested Visibilit
y</name>
<thead> <thead>
<tr> <tr>
<th align="left">Chapter + Nested Chapter</th> <th align="left">Chapter + Nested Chapter</th>
<th align="left">ChapterFlagHidden</th> <th align="left">ChapterFlagHidden</th>
<th align="left">visible</th> <th align="left">visible</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 7054 skipping to change at line 7277
<tr> <tr>
<td align="left">Nested Chapter 2.2</td> <td align="left">Nested Chapter 2.2</td>
<td align="left">1</td> <td align="left">1</td>
<td align="left">no</td> <td align="left">no</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
</section> </section>
<section anchor="menu-features"><name>Menu features</name> <section anchor="menu-features"><name>Menu Features</name>
<t>The menu features are handled like a <tt>chapter codec</tt>. That means each codec has a type, <t>The menu features are handled like a <tt>chapter codec</tt>. That means each codec has a type,
some private data and some data in the chapters.</t> some private data, and some data in the chapters.</t>
<t>The type of the menu system is defined by the <tt>ChapProcessCodecID</tt> par <t>The type of the menu system is defined by the <tt>ChapProcessCodecID</tt> par
ameter. For now, ameter.
only 2 values are supported : 0 matroska script, 1 menu borrowed from the DVD <x For now, only two values are supported: 0 (Matroska Script) and 1 (menu borrowed
ref target="DVD-Video"></xref>. from the DVD <xref target="DVD-Video"></xref>).
The private data depend on the type of menu system (stored in <tt>ChapProcessPri
vate</tt>), The private data stored in <tt>ChapProcessPrivate</tt> and
idem for the data in the chapters (stored in <tt>ChapProcessData</tt>).</t> <tt>ChapProcessData</tt> depends on the <tt>ChapProcessCodecID</tt> value.
<t>The menu system, as well as Chapter Codecs in general, can do actions on the </t><t>The menu system, as well as Chapter Codecs in general, can perform action
<tt>Matroska Player</tt> s on the Matroska Player, such as jumping to another <tt>Chapter</tt> or <tt>Edi
like jumping to another Chapter or Edition, selecting different tracks and possi tion</tt>, selecting different tracks, and possibly more.
bly more. The scope of all the possibilities of Chapter Codecs is not covered in this docu
The scope of all the possibilities of Chapter Codecs is not covered in this docu ment, as it
ment as it depends on the Chapter Codec features and its integration in a Matroska Player.<
depends on the Chapter Codec features and its integration in a <tt>Matroska Play /t>
er</tt>.</t>
</section> </section>
<section anchor="physical-types"><name>Physical Types</name> <section anchor="physical-types"><name>Physical Types</name>
<t>Each level can have different meanings for audio and video. The <tt>ORIGINAL_ MEDIA_TYPE</tt> tag <xref target="MatroskaTags"></xref> can be used to <t>Each level can have different meanings for audio and video. The <tt>ORIGINAL_ MEDIA_TYPE</tt> tag <xref target="I-D.ietf-cellar-tags"></xref> can be used to
specify a string for ChapterPhysicalEquiv = 60. Here is the list of possible lev els for both audio and video:</t> specify a string for ChapterPhysicalEquiv = 60. Here is the list of possible lev els for both audio and video:</t>
<table anchor="ChapterPhysicalEquivMeaning"><name>ChapterPhysicalEquiv meaning p er track type</name> <table anchor="ChapterPhysicalEquivMeaning"><name>ChapterPhysicalEquiv Meaning p er Track Type</name>
<thead> <thead>
<tr> <tr>
<th align="left">Value</th> <th align="left">Value</th>
<th align="left">Audio</th> <th align="left">Audio</th>
<th align="left">Video</th> <th align="left">Video</th>
<th align="left">Comment</th> <th align="left">Comment</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">70</td> <td align="left">70</td>
<td align="left">SET / PACKAGE</td> <td align="left">SET / PACKAGE</td>
<td align="left">SET / PACKAGE</td> <td align="left">SET / PACKAGE</td>
<td align="left">the collection of different media</td> <td align="left">the collection of different media</td>
</tr> </tr>
<tr> <tr>
<td align="left">60</td> <td align="left">60</td>
<td align="left">CD / 12&quot; / 10&quot; / 7&quot; / TAPE / MINIDISC / DAT</td> <td align="left">CD / 12" / 10" / 7" / TAPE / MINIDISC / DAT</td>
<td align="left">DVD / VHS / LASERDISC</td> <td align="left">DVD / VHS / LASERDISC</td>
<td align="left">the physical medium like a CD or a DVD</td> <td align="left">the physical medium like a CD or a DVD</td>
</tr> </tr>
<tr> <tr>
<td align="left">50</td> <td align="left">50</td>
<td align="left">SIDE</td> <td align="left">SIDE</td>
<td align="left">SIDE</td> <td align="left">SIDE</td>
<td align="left">when the original medium (LP/DVD) has different sides</td> <td align="left">when the original medium (LP/DVD) has different sides</td>
</tr> </tr>
skipping to change at line 7134 skipping to change at line 7357
<td align="left">10</td> <td align="left">10</td>
<td align="left">INDEX</td> <td align="left">INDEX</td>
<td align="left">-</td> <td align="left">-</td>
<td align="left">the first logical level of the side/medium</td> <td align="left">the first logical level of the side/medium</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
<section anchor="chapter-examples"><name>Chapter Examples</name> <section anchor="chapter-examples"><name>Chapter Examples</name>
<section anchor="example-1-basic-chaptering"><name>Example 1 : basic chaptering< <section anchor="example-1-basic-chaptering"><name>Example 1: Basic Chaptering</
/name> name>
<t>In this example a movie is split in different chapters. It could also just be <t>In this example, a movie is split in different chapters. It could also just b
an e an
audio file (album) on which each track corresponds to a chapter.</t> audio file (album) in which each track corresponds to a chapter.</t>
<ul spacing="compact"> <ul spacing="compact">
<li>00000 ms - 05000 ms : Intro</li> <li>00000 ms - 05000 ms: Intro</li>
<li>05000 ms - 25000 ms : Before the crime</li> <li>05000 ms - 25000 ms: Before the crime</li>
<li>25000 ms - 27500 ms : The crime</li> <li>25000 ms - 27500 ms: The crime</li>
<li>27500 ms - 38000 ms : The killer arrested</li> <li>27500 ms - 38000 ms: After the crime</li>
<li>38000 ms - 43000 ms : Credits</li> <li>38000 ms - 43000 ms: Credits</li>
</ul> </ul>
<t>This would translate in the following matroska form, with the EBML tree shown
as XML :</t> <t>This translates to Matroska form, with the EBML tree shown as follows in XML:
<figure><name>Basic Chapters Example. </t>
<figure><name>Basic Chapters Example
</name> </name>
<sourcecode type="xml">&lt;Chapters&gt; <sourcecode type="xml">&lt;Chapters&gt;
&lt;EditionEntry&gt; &lt;EditionEntry&gt;
&lt;EditionUID&gt;16603393396715046047&lt;/EditionUID&gt; &lt;EditionUID&gt;16603393396715046047&lt;/EditionUID&gt;
&lt;ChapterAtom&gt; &lt;ChapterAtom&gt;
&lt;ChapterUID&gt;1193046&lt;/ChapterUID&gt; &lt;ChapterUID&gt;1193046&lt;/ChapterUID&gt;
&lt;ChapterTimeStart&gt;0&lt;/ChapterTimeStart&gt; &lt;ChapterTimeStart&gt;0&lt;/ChapterTimeStart&gt;
&lt;ChapterTimeEnd&gt;5000000000&lt;/ChapterTimeEnd&gt; &lt;ChapterTimeEnd&gt;5000000000&lt;/ChapterTimeEnd&gt;
&lt;ChapterDisplay&gt; &lt;ChapterDisplay&gt;
&lt;ChapString&gt;Intro&lt;/ChapString&gt; &lt;ChapString&gt;Intro&lt;/ChapString&gt;
skipping to change at line 7213 skipping to change at line 7437
&lt;ChapString&gt;Generique&lt;/ChapString&gt; &lt;ChapString&gt;Generique&lt;/ChapString&gt;
&lt;ChapLanguage&gt;fra&lt;/ChapLanguage&gt; &lt;ChapLanguage&gt;fra&lt;/ChapLanguage&gt;
&lt;/ChapterDisplay&gt; &lt;/ChapterDisplay&gt;
&lt;/ChapterAtom&gt; &lt;/ChapterAtom&gt;
&lt;/EditionEntry&gt; &lt;/EditionEntry&gt;
&lt;/Chapters&gt; &lt;/Chapters&gt;
</sourcecode> </sourcecode>
</figure> </figure>
</section> </section>
<section anchor="example-2-nested-chapters"><name>Example 2 : nested chapters</n <section anchor="example-2-nested-chapters"><name>Example 2: Nested Chapters</na
ame> me>
<t>In this example an (existing) album is split into different chapters, and one <t>In this example, an (existing) album is split into different chapters, and on
e
of them contains another splitting.</t> of them contains another splitting.</t>
<section anchor="the-micronauts-bleep-to-bleep"><name>The Micronauts &quot;Bleep To Bleep&quot;</name> <section anchor="the-micronauts-bleep-to-bleep"><name>The Micronauts "Bleep To B leep"</name>
<ul spacing="compact"> <ul spacing="compact">
<li><t>00:00 - 12:28 : Baby Wants To Bleep/Rock</t> <li><t>00:00 - 12:28: Baby wants to Bleep/Rock</t>
<ul spacing="compact"> <ul spacing="compact">
<li>00:00 - 04:38 : Baby wants to bleep (pt.1)</li> <li>00:00 - 04:38: Baby wants to bleep (pt.1)</li>
<li>04:38 - 07:12 : Baby wants to rock</li> <li>04:38 - 07:12: Baby wants to rock</li>
<li>07:12 - 10:33 : Baby wants to bleep (pt.2)</li> <li>07:12 - 10:33: Baby wants to bleep (pt.2)</li>
<li>10:33 - 12:28 : Baby wants to bleep (pt.3)</li> <li>10:33 - 12:28: Baby wants to bleep (pt.3)</li>
</ul></li> </ul></li>
<li>12:30 - 19:38 : Bleeper_O+2</li> <li>12:30 - 19:38: Bleeper_O+2</li>
<li>19:40 - 22:20 : Baby wants to bleep (pt.4)</li> <li>19:40 - 22:20: Baby wants to bleep (pt.4)</li>
<li>22:22 - 25:18 : Bleep to bleep</li> <li>22:22 - 25:18: Bleep to bleep</li>
<li>25:20 - 33:35 : Baby wants to bleep (k)</li> <li>25:20 - 33:35: Baby wants to bleep (k)</li>
<li>33:37 - 44:28 : Bleeper</li> <li>33:37 - 44:28: Bleeper</li>
</ul> </ul>
<t>This would translate in the following matroska form, with the EBML tree shown
as XML :</t> <t>This translates to Matroska form, with the EBML tree shown as follows in XML:
<figure><name>Nested Chapters Example. </t>
<figure><name>Nested Chapters Example
</name> </name>
<sourcecode type="xml">&lt;Chapters&gt; <sourcecode type="xml">&lt;Chapters&gt;
&lt;EditionEntry&gt; &lt;EditionEntry&gt;
&lt;EditionUID&gt;1281690858003401414&lt;/EditionUID&gt; &lt;EditionUID&gt;1281690858003401414&lt;/EditionUID&gt;
&lt;ChapterAtom&gt; &lt;ChapterAtom&gt;
&lt;ChapterUID&gt;1&lt;/ChapterUID&gt; &lt;ChapterUID&gt;1&lt;/ChapterUID&gt;
&lt;ChapterTimeStart&gt;0&lt;/ChapterTimeStart&gt; &lt;ChapterTimeStart&gt;0&lt;/ChapterTimeStart&gt;
&lt;ChapterTimeEnd&gt;748000000&lt;/ChapterTimeEnd&gt; &lt;ChapterTimeEnd&gt;748000000&lt;/ChapterTimeEnd&gt;
&lt;ChapterDisplay&gt; &lt;ChapterDisplay&gt;
&lt;ChapString&gt;Baby wants to Bleep/Rock&lt;/ChapString&gt; &lt;ChapString&gt;Baby wants to Bleep/Rock&lt;/ChapString&gt;
skipping to change at line 7331 skipping to change at line 7555
&lt;/Chapters&gt; &lt;/Chapters&gt;
</sourcecode> </sourcecode>
</figure> </figure>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
<section anchor="attachments-1"><name>Attachments</name> <section anchor="attachments-1"><name>Attachments</name>
<t>Matroska supports storage of related files and data in the <tt>Attachments El ement</tt> <t>Matroska supports storage of related files and data in the <tt>Attachments El ement</tt>
(a <tt>Top-Level Element</tt>). <tt>Attachment Elements</tt> can be used to stor (a <tt>Top-Level Element</tt>). An <tt>Attachments Element</tt> can be used to s
e related cover art, tore related cover art,
font files, transcripts, reports, error recovery files, picture, or text-based a font files, transcripts, reports, error recovery files, pictures, text-based ann
nnotations, otations,
copies of specifications, or other ancillary files related to the <tt>Segment</t t>.</t> copies of specifications, or other ancillary files related to the <tt>Segment</t t>.</t>
<t><tt>Matroska Readers</tt> <bcp14>MUST NOT</bcp14> execute files stored as <tt >Attachment Elements</tt>.</t> <t><tt>Matroska Readers</tt> <bcp14>MUST NOT</bcp14> execute files stored as an <tt>Attachments Element</tt>.</t>
<section anchor="cover-art"><name>Cover Art</name> <section anchor="cover-art"><name>Cover Art</name>
<t>This section defines a set of guidelines for the storage of cover art in Matr oska files. <t>This section defines a set of guidelines for the storage of cover art in Matr oska files.
A <tt>Matroska Reader</tt> <bcp14>MAY</bcp14> use embedded cover art to display a representational A Matroska Reader <bcp14>MAY</bcp14> use embedded cover art to display a represe ntational
still-image depiction of the multimedia contents of the Matroska file.</t> still-image depiction of the multimedia contents of the Matroska file.</t>
<t>Only <xref target="JPEG"></xref> and PNG <xref target="RFC2083"></xref> image formats <bcp14>SHOULD</bcp14> be used for cover art pictures.</t> <t>Only <xref target="JPEG"></xref> and PNG <xref target="RFC2083"></xref> image formats <bcp14>SHOULD</bcp14> be used for cover art pictures.</t>
<t>There can be two different covers for a movie/album: a portrait style (e.g., a DVD case) <t>There can be two different covers for a movie/album: a portrait style (e.g., a DVD case)
and a landscape style (e.g., a wide banner ad).</t> and a landscape style (e.g., a wide banner ad).</t>
<t>There can be two versions of the same cover, the <tt>normal cover</tt> and th <t>There can be two versions of the same cover: the <tt>normal cover</tt> and
e <tt>small cover</tt>. the <tt>small cover</tt>. The dimension of the <tt>normal cover</tt>
The dimension of the <tt>normal cover</tt> <bcp14>SHOULD</bcp14> be 600 pixels o <bcp14>SHOULD</bcp14> be 600 pixels on the smallest side (e.g., 960x600 for
n the smallest side -- for example, landscape, 600x800 for portrait, or 600x600 for square). The dimension of the
960x600 for landscape, 600x800 for portrait, or 600x600 for square. The dimensio <tt>small cover</tt> <bcp14>SHOULD</bcp14> be 120 pixels on the smallest side
n of (e.g., 192x120 or 120x160).</t>
the <tt>small cover</tt> <bcp14>SHOULD</bcp14> be 120 pixels on the smallest sid <t>Versions of cover art can be differentiated by the filename, which is
e -- for example, 192x120 or 120x160.</t> stored in the <tt>FileName Element</tt>. The default filename of the
<t>Versions of cover art can be differentiated by the filename, which is stored <tt>normal cover</tt> in square or portrait mode is
in the <tt>cover.(jpg|png)</tt>. When stored, the <tt>normal cover</tt>
<tt>FileName Element</tt>. The default filename of the <tt>normal cover</tt> in <bcp14>SHOULD</bcp14> be the first <tt>Attachments Element</tt> in storage
square or portrait mode order. The <tt>small cover</tt> <bcp14>SHOULD</bcp14> be prefixed with
is <tt>cover.(jpg|png)</tt>. When stored, the <tt>normal cover</tt> <bcp14>SHOUL "small_", such as <tt>small_cover.(jpg|png)</tt>. The landscape variant
D</bcp14> be the first Attachment in <bcp14>SHOULD</bcp14> be suffixed with "_land", such as
storage order. The <tt>small cover</tt> <bcp14>SHOULD</bcp14> be prefixed with & <tt>cover_land.(jpg|png)</tt>. The filenames are case-sensitive.</t>
quot;small_&quot;, such as <t>The following table provides examples of file names for cover art in <tt>Atta
<tt>small_cover.(jpg|png)</tt>. The landscape variant <bcp14>SHOULD</bcp14> be s chments</tt>.</t>
uffixed with &quot;_land&quot;,
such as <tt>cover_land.(jpg|png)</tt>. The filenames are case-sensitive.</t>
<t>The following table provides examples of file names for cover art in Attachme
nts.</t>
<table anchor="coverartFilenames"><name>Cover Art Filenames</name> <table anchor="coverartFilenames"><name>Cover Art Filenames</name>
<thead> <thead>
<tr> <tr>
<th>FileName</th> <th>File Name</th>
<th>Image Orientation</th> <th>Image Orientation</th>
<th>Pixel Length of Smallest Side</th> <th>Pixel Length of Smallest Side</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td>cover.jpg</td> <td>cover.jpg</td>
<td>Portrait or square</td> <td>Portrait or square</td>
<td>600</td> <td>600</td>
skipping to change at line 7390 skipping to change at line 7619
</tr> </tr>
<tr> <tr>
<td>small_cover_land.jpg</td> <td>small_cover_land.jpg</td>
<td>Landscape</td> <td>Landscape</td>
<td>120</td> <td>120</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
<section anchor="font-files"><name>Font files</name> <section anchor="font-files"><name>Font Files</name>
<t>Font files <bcp14>MAY</bcp14> be added to a Matroska file as Attachments so t hat the font file may be used <t>Font files <bcp14>MAY</bcp14> be added to a Matroska file as Attachments so t hat the font file may be used
to display an associated subtitle track. This allows the presentation of a Matro ska file to be to display an associated subtitle track. This allows the presentation of a Matro ska file to be
consistent in various environments where the needed fonts might not be available on the local system.</t> consistent in various environments where the needed fonts might not be available on the local system.</t>
<t>Depending on the font format in question, each font file can contain multiple font variants. <t>Depending on the font format in question, each font file can contain multiple font variants.
Each font variant has a name which will be referred to as Font Name from now on. Each font variant has a name that will be referred to as Font Name from now on.
This Font Name can be different from the Attachment's <tt>FileName</tt>, even wh en disregarding the extension. This Font Name can be different from the Attachment's <tt>FileName</tt>, even wh en disregarding the extension.
In order to select a font for display, a Matroska player <bcp14>SHOULD</bcp14> c In order to select a font for display, a Matroska Player <bcp14>SHOULD</bcp14> c
onsider both the Font Name onsider both the Font Name
and the base name of the Attachment's FileName, preferring the former when there and the base name of the Attachment's <tt>FileName</tt>, preferring the former w
are multiple matches.</t> hen there are multiple matches.</t>
<t>Subtitle codecs, such as SubStation Alpha (SSA/ASS), usually refer to a font <t>Subtitle codecs, such as SubStation Alpha (SSA) and Advanced SubStation Alpha
by its Font Name, not (ASS), usually refer to a font by its Font Name, not by its filename.
by its filename. If none of the Attachments are a match for the Font Name, the Matroska Player <b
If none of the Attachments are a match for the Font Name, the Matroska player <b cp14>SHOULD</bcp14>
cp14>SHOULD</bcp14>
attempt to find a system font whose Font Name matches the one used in the subtit le track.</t> attempt to find a system font whose Font Name matches the one used in the subtit le track.</t>
<t>Since loading fonts temporarily can take a while, a Matroska player usually <t>Since loading fonts temporarily can take a while, a Matroska Player usually
loads or installs all the fonts found in attachments so they are ready to be use d during playback. loads or installs all the fonts found in attachments so they are ready to be use d during playback.
Failure to use the font attachment might result in incorrect rendering of the su btitles.</t> Failure to use the font attachment might result in incorrect rendering of the su btitles.</t>
<t>If a selected subtitle track has some <tt>AttachmentLink</tt> elements, the p layer <bcp14>MAY</bcp14> restrict its font rendering to use only these fonts.</t > <t>If a selected subtitle track has some <tt>AttachmentLink</tt> elements, the p layer <bcp14>MAY</bcp14> restrict its font rendering to use only these fonts.</t >
<t>A Matroska player <bcp14>SHOULD</bcp14> handle the official font media types from <xref target="RFC8081"></xref> when the system can handle the type:</t> <t>A Matroska Player <bcp14>SHOULD</bcp14> handle the official font media types from <xref target="RFC8081"></xref> when the system can handle the type:</t>
<ul> <ul>
<li><t><tt>font/sfnt</tt>: Generic SFNT Font Type,</t> <li>font/sfnt: Generic SFNT Font Type</li>
</li> <li>font/ttf: TrueType Font (TTF) Font Type</li>
<li><t><tt>font/ttf</tt>: TTF Font Type,</t> <li>font/otf: OpenType Layout (OTF) Font Type</li>
</li> <li>font/collection: Collection Font Type</li>
<li><t><tt>font/otf</tt>: OpenType Layout (OTF) Font Type,</t> <li>font/woff: WOFF 1.0</li>
</li> <li>font/woff2: WOFF 2.0</li>
<li><t><tt>font/collection</tt>: Collection Font Type,</t>
</li>
<li><t><tt>font/woff</tt>: WOFF 1.0,</t>
</li>
<li><t><tt>font/woff2</tt>: WOFF 2.0.</t>
</li>
</ul> </ul>
<t>Fonts in Matroska existed long before <xref target="RFC8081"></xref>. A few u nofficial media types for fonts were used in existing files. <t>Fonts in Matroska existed long before <xref target="RFC8081"></xref>. A few u nofficial media types for fonts were used in existing files.
Therefore, it is <bcp14>RECOMMENDED</bcp14> for a Matroska player to support the following legacy media types for font attachments:</t> Therefore, it is <bcp14>RECOMMENDED</bcp14> for a Matroska Player to support the following legacy media types for font attachments:</t>
<ul> <ul>
<li><t><tt>application/x-truetype-font</tt>: Truetype fonts, equivalent to <tt>f <li>application/x-truetype-font: TrueType fonts, equivalent to <tt>font/ttf</tt>
ont/ttf</tt> and sometimes <tt>font/otf</tt>,</t> and sometimes <tt>font/otf</tt></li>
</li> <li>application/x-font-ttf: TrueType fonts, equivalent to <tt>font/ttf</tt></li>
<li><t><tt>application/x-font-ttf</tt>: TTF fonts, equivalent to <tt>font/ttf</t <li>application/vnd.ms-opentype: OpenType Layout fonts, equivalent to <tt>font/o
t>,</t> tf</tt></li>
</li> <li>application/font-sfnt: Generic SFNT Font Type, equivalent to <tt>font/sfnt</
<li><t><tt>application/vnd.ms-opentype</tt>: OpenType Layout fonts, equivalent t tt></li>
o <tt>font/otf</tt></t> <li>application/font-woff: WOFF 1.0, equivalent to <tt>font/woff</tt></li>
</li>
<li><t><tt>application/font-sfnt</tt>: Generic SFNT Font Type, equivalent to <tt
>font/sfnt</tt></t>
</li>
<li><t><tt>application/font-woff</tt>: WOFF 1.0, equivalent to <tt>font/woff</tt
></t>
</li>
</ul> </ul>
<t>There may also be some font attachments with the <tt>application/octet-stream </tt> media type. <t>There may also be some font attachments with the <tt>application/octet-stream </tt> media type.
In that case the Matroska player <bcp14>MAY</bcp14> try to guess the font type b y checking the file extension of the <tt>AttachedFile\FileName</tt> string. In that case, the Matroska Player <bcp14>MAY</bcp14> try to guess the font type by checking the file extension of the <tt>AttachedFile\FileName</tt> string.
Common file extensions for fonts are:</t> Common file extensions for fonts are:</t>
<ul> <ul>
<li><t><tt>.ttf</tt> for Truetype fonts, equivalent to <tt>font/ttf</tt>,</t> <li><t><tt>.ttf</tt> for TrueType fonts, equivalent to <tt>font/ttf</tt></t>
</li> </li>
<li><t><tt>.otf</tt> for OpenType Layout fonts, equivalent to <tt>font/otf</tt>, </t> <li><t><tt>.otf</tt> for OpenType Layout fonts, equivalent to <tt>font/otf</tt>< /t>
</li> </li>
<li><t><tt>.ttc</tt> for Collection fonts, equivalent to <tt>font/collection</tt ></t> <li><t><tt>.ttc</tt> for Collection fonts, equivalent to <tt>font/collection</tt ></t>
</li> </li>
</ul> </ul>
<t>The file extension check <bcp14>MUST</bcp14> be case-insensitive.</t> <t>The file extension check <bcp14>MUST</bcp14> be case-insensitive.</t>
<t>Matroska writers <bcp14>SHOULD</bcp14> use a valid font media type from <xref target="RFC8081"></xref> in the <tt>AttachedFile\FileMediaType</tt> of the font attachment. <t>Matroska Writers <bcp14>SHOULD</bcp14> use a valid font media type from <xref target="RFC8081"></xref> in the <tt>AttachedFile\FileMediaType</tt> of the font attachment.
They <bcp14>MAY</bcp14> use the media types found in older files when compatibil ity with older players is necessary.</t> They <bcp14>MAY</bcp14> use the media types found in older files when compatibil ity with older players is necessary.</t>
</section> </section>
</section> </section>
<section anchor="cues"><name>Cues</name> <section anchor="cues"><name>Cues</name>
<t>The <tt>Cues Element</tt> provides an index of certain <tt>Cluster Elements</ tt> to allow for optimized <t>The <tt>Cues Element</tt> provides an index of certain <tt>Cluster Elements</ tt> to allow for optimized
seeking to absolute timestamps within the <tt>Segment</tt>. The <tt>Cues Element </tt> contains one or seeking to absolute timestamps within the <tt>Segment</tt>. The <tt>Cues Element </tt> contains one or
many <tt>CuePoint Elements</tt> which each <bcp14>MUST</bcp14> reference an abso lute timestamp (via the many <tt>CuePoint Elements</tt>, each of which <bcp14>MUST</bcp14> reference an absolute timestamp (via the
<tt>CueTime Element</tt>), a <tt>Track</tt> (via the <tt>CueTrack Element</tt>), and a <tt>Segment Position</tt> <tt>CueTime Element</tt>), a <tt>Track</tt> (via the <tt>CueTrack Element</tt>), and a <tt>Segment Position</tt>
(via the <tt>CueClusterPosition Element</tt>). Additional non-mandated Elements are part of (via the <tt>CueClusterPosition Element</tt>). Additional non-mandated Elements are part of
the <tt>CuePoint Element</tt> such as <tt>CueDuration</tt>, <tt>CueRelativePosit the <tt>CuePoint Element</tt>, such as <tt>CueDuration</tt>, <tt>CueRelativePosi
ion</tt>, <tt>CueCodecState</tt> tion</tt>, <tt>CueCodecState</tt>,
and others which provide any <tt>Matroska Reader</tt> with additional informatio and others that provide any Matroska Reader with additional information to use i
n to use in n
the optimization of seeking performance.</t> the optimization of seeking performance.</t>
<section anchor="recommendations"><name>Recommendations</name> <section anchor="recommendations"><name>Recommendations</name>
<t>The following recommendations are provided to optimize Matroska performance.< /t> <t>The following recommendations are provided to optimize Matroska performance.< /t>
<ul> <ul>
<li><t>Unless Matroska is used as a live stream, it <bcp14>SHOULD</bcp14> contai n a <tt>Cues Element</tt>.</t> <li><t>Unless Matroska is used as a live stream, it <bcp14>SHOULD</bcp14> contai n a <tt>Cues Element</tt>.</t>
</li> </li>
<li><t>For each video track, each keyframe <bcp14>SHOULD</bcp14> be referenced b y a <tt>CuePoint Element</tt>.</t> <li><t>For each video track, each keyframe <bcp14>SHOULD</bcp14> be referenced b y a <tt>CuePoint Element</tt>.</t>
</li> </li>
<li><t>It is <bcp14>RECOMMENDED</bcp14> to not reference non-keyframes of video tracks in <tt>Cues</tt> unless <li><t>It is <bcp14>RECOMMENDED</bcp14> to not reference non-keyframes of video tracks in <tt>Cues</tt> unless
it references a <tt>Cluster Element</tt> which contains a <tt>CodecState Element </tt> but no keyframes.</t> it references a <tt>Cluster Element</tt> that contains a <tt>CodecState Element< /tt> but no keyframes.</t>
</li> </li>
<li><t>For each subtitle track present, each subtitle frame <bcp14>SHOULD</bcp14 > be referenced by a <li><t>For each subtitle track present, each subtitle frame <bcp14>SHOULD</bcp14 > be referenced by a
<tt>CuePoint Element</tt> with a <tt>CueDuration Element</tt>.</t> <tt>CuePoint Element</tt> with a <tt>CueDuration Element</tt>.</t>
</li> </li>
<li><t>References to audio tracks <bcp14>MAY</bcp14> be skipped in <tt>CuePoint Elements</tt> if a video track <li><t>References to audio tracks <bcp14>MAY</bcp14> be skipped in <tt>CuePoint Elements</tt> if a video track
is present. When included the <tt>CuePoint Elements</tt> <bcp14>SHOULD</bcp14> r is present. When included, the <tt>CuePoint Elements</tt> <bcp14>SHOULD</bcp14>
eference audio keyframes reference audio keyframes
at most once every 500 milliseconds.</t> once every 500 milliseconds at most.</t>
</li> </li>
<li><t>If the referenced frame is not stored within the first <tt>SimpleBlock</t t>, or first <li><t>If the referenced frame is not stored within the first <tt>SimpleBlock</t t> or first
<tt>BlockGroup</tt> within its <tt>Cluster Element</tt>, then the <tt>CueRelativ ePosition Element</tt> <tt>BlockGroup</tt> within its <tt>Cluster Element</tt>, then the <tt>CueRelativ ePosition Element</tt>
<bcp14>SHOULD</bcp14> be written to reference where in the <tt>Cluster</tt> the reference frame is stored.</t> <bcp14>SHOULD</bcp14> be written to reference where in the <tt>Cluster</tt> the reference frame is stored.</t>
</li> </li>
<li><t>If a <tt>CuePoint Element</tt> references <tt>Cluster Element</tt> that i ncludes a <tt>CodecState Element</tt>, <li><t>If a <tt>CuePoint Element</tt> references a <tt>Cluster Element</tt> that includes a <tt>CodecState Element</tt>,
then that <tt>CuePoint Element</tt> <bcp14>MUST</bcp14> use a <tt>CueCodecState Element</tt>.</t> then that <tt>CuePoint Element</tt> <bcp14>MUST</bcp14> use a <tt>CueCodecState Element</tt>.</t>
</li> </li>
<li><t><tt>CuePoint Elements</tt> <bcp14>SHOULD</bcp14> be numerically sorted in storage order by the value of the <tt>CueTime Element</tt>.</t> <li><t><tt>CuePoint Elements</tt> <bcp14>SHOULD</bcp14> be numerically sorted in storage order by the value of the <tt>CueTime Element</tt>.</t>
</li> </li>
</ul> </ul>
</section> </section>
</section> </section>
<section anchor="matroska-streaming"><name>Matroska Streaming</name> <section anchor="matroska-streaming"><name>Matroska Streaming</name>
<t>In Matroska, there are two kinds of streaming: file access and livestreaming. </t> <t>In Matroska, there are two kinds of streaming: file access and livestreaming. </t>
<section anchor="file-access"><name>File Access</name> <section anchor="file-access"><name>File Access</name>
<t>File access can simply be reading a file located on your computer, but also i <t>File access can simply be reading a file located on your computer, but it als
ncludes o includes
accessing a file from an HTTP (web) server or CIFS (Windows share) server. These accessing a file from an HTTP (web) server or Common Internet File System (CIFS)
protocols (Windows share) server. These protocols
are usually safe from reading errors and seeking in the stream is possible. Howe are usually safe from reading errors, and seeking in the stream is possible. How
ver, ever,
when a file is stored far away or on a slow server, seeking can be an expensive operation when a file is stored far away or on a slow server, seeking can be an expensive operation
and should be avoided. The guidelines in <xref target="implementation-recommenda and should be avoided.
tions"></xref>, when followed, help reduce the number When followed, the guidelines in <xref
of seeking operations for regular playback and also have the playback start quic target="implementation-recommendations"></xref> help reduce the number of
kly without seeking operations for regular playback and also have the playback start
a lot of data needed to read first (like a <tt>Cues Element</tt>, <tt>Attachment quickly without needing to read lot of data first (like a <tt>Cues Element</tt>,
Element</tt> or <tt>SeekHead Element</tt>).</t> <tt>Attachments Element</tt>, or <tt>SeekHead Element</tt>).</t>
<t>Matroska, having a small overhead, is well suited for storing music/videos on file <t>Matroska, having a small overhead, is well suited for storing music/videos on file
servers without a big impact on the bandwidth used. Matroska does not require th e index servers without a big impact on the bandwidth used. Matroska does not require th e index
to be loaded before playing, which allows playback to start very quickly. The in dex can to be loaded before playing, which allows playback to start very quickly. The in dex can
be loaded only when seeking is requested the first time.</t> be loaded only when seeking is requested the first time.</t>
</section> </section>
<section anchor="livestreaming"><name>Livestreaming</name> <section anchor="livestreaming"><name>Livestreaming</name>
<t>Livestreaming is the equivalent of television broadcasting on the internet. T <t>Livestreaming is the equivalent of television broadcasting on the Internet. T
here are 2 here are two
families of servers for livestreaming: RTP/RTSP and HTTP. Matroska is not meant families of servers for livestreaming: RTP / Real-Time Streaming Protocol (RTSP)
to be and HTTP. Matroska is not meant to be
used over RTP. RTP already has timing and channel mechanisms that would be waste d if doubled used over RTP. RTP already has timing and channel mechanisms that would be waste d if doubled
in Matroska. Additionally, having the same information at the RTP and Matroska l evel would in Matroska. Additionally, having the same information at the RTP and Matroska l evel would
be a source of confusion if they do not match. be a source of confusion if they do not match.
Livestreaming of Matroska over file-like protocols like HTTP, QUIC, etc. is poss ible.</t> Livestreaming of Matroska over file-like protocols like HTTP, QUIC, etc., is pos sible.</t>
<t>A live Matroska stream is different from a file because it usually has no kno wn end <t>A live Matroska stream is different from a file because it usually has no kno wn end
(only ending when the client disconnects). For this, all bits of the &quot;size& quot; portion (only ending when the client disconnects). For this, all bits of the "size" port ion
of the <tt>Segment Element</tt> <bcp14>MUST</bcp14> be set to 1. Another option is to concatenate <tt>Segment Elements</tt> of the <tt>Segment Element</tt> <bcp14>MUST</bcp14> be set to 1. Another option is to concatenate <tt>Segment Elements</tt>
with known sizes, one after the other. This solution allows a change of codec/re solution with known sizes, one after the other. This solution allows a change of codec/re solution
between each segment. For example, this allows for a switch between 4:3 and 16:9 in a television program.</t> between each segment. For example, this allows for a switch between 4:3 and 16:9 in a television program.</t>
<t>When <tt>Segment Elements</tt> are continuous, certain <tt>Elements</tt>, lik <t>When <tt>Segment Elements</tt> are continuous, certain <tt>Elements</tt> (lik
e <tt>SeekHead</tt>, <tt>Cues</tt>, e <tt>SeekHead</tt>, <tt>Cues</tt>,
<tt>Chapters</tt>, and <tt>Attachments</tt>, <bcp14>MUST NOT</bcp14> be used.</t <tt>Chapters</tt>, and <tt>Attachments</tt>) <bcp14>MUST NOT</bcp14> be used.</t
> >
<t>It is possible for a <tt>Matroska Player</tt> to detect that a stream is not <t>It is possible for a Matroska Player to detect that a stream is not seekable.
seekable.
If the stream has neither a <tt>SeekHead</tt> list nor a <tt>Cues</tt> list at t he beginning of the stream, If the stream has neither a <tt>SeekHead</tt> list nor a <tt>Cues</tt> list at t he beginning of the stream,
it <bcp14>SHOULD</bcp14> be considered non-seekable. Even though it is possible to seek forward it <bcp14>SHOULD</bcp14> be considered non-seekable. Even though it is possible to seek forward
in the stream, it is <bcp14>NOT RECOMMENDED</bcp14>.</t> in the stream, it is <bcp14>NOT RECOMMENDED</bcp14>.</t>
<t>In the context of live radio or web TV, it is possible to &quot;tag&quot; the content while it is <t>In the context of live radio or web TV, it is possible to "tag" the content w hile it is
playing. The <tt>Tags Element</tt> can be placed between <tt>Clusters</tt> each time it is necessary. playing. The <tt>Tags Element</tt> can be placed between <tt>Clusters</tt> each time it is necessary.
In that case, the new <tt>Tags Element</tt> <bcp14>MUST</bcp14> reset the previo usly encountered <tt>Tags Elements</tt> In that case, the new <tt>Tags Element</tt> <bcp14>MUST</bcp14> reset the previo usly encountered <tt>Tags Elements</tt>
and use the new values instead.</t> and use the new values instead.</t>
</section> </section>
</section> </section>
<section anchor="tags-1"><name>Tags</name> <section anchor="tags-1"><name>Tags</name>
<section anchor="tags-precedence"><name>Tags Precedence</name> <section anchor="tags-precedence"><name>Tags Precedence</name>
<t>Tags allow tagging all kinds of Matroska parts with very detailed metadata in multiple languages.</t> <t>Tags allow tagging all kinds of Matroska parts with very detailed metadata in multiple languages.</t>
<t>Some Matroska elements also contain their own string value like the Track Nam e (<xref target="name-element"></xref>) or the Chapter String (<xref target="cha pstring-element"></xref>).</t> <t>Some Matroska elements also contain their own string value, like the <tt>Name </tt> element (<xref target="name-element"></xref>) or the <tt>ChapString</tt> e lement (<xref target="chapstring-element"></xref>).</t>
<t>The following Matroska elements can also be defined with tags:</t> <t>The following Matroska elements can also be defined with tags:</t>
<ul> <ul>
<li><t>The Track Name Element (<xref target="name-element"></xref>) corresponds to a tag with the TagTrackUID (<xref target="tagtrackuid-element"></xref>) set t o the given track, a TagName of <tt>TITLE</tt> (<xref target="tagname-element">< /xref>) and a TagLanguage (<xref target="taglanguage-element"></xref>) or TagLan guageBCP47 (<xref target="taglanguagebcp47-element"></xref>) of &quot;und&quot;. </t> <li><t>The <tt>Name</tt> Element (<xref target="name-element"></xref>) correspon ds to a tag with the <tt>TagTrackUID</tt> (<xref target="tagtrackuid-element"></ xref>) set to the given track, a <tt>TagName</tt> of <tt>TITLE</tt> (<xref targe t="tagname-element"></xref>), and a <tt>TagLanguage</tt> (<xref target="taglangu age-element"></xref>) or <tt>TagLanguageBCP47</tt> (<xref target="taglanguagebcp 47-element"></xref>) of "und".</t>
</li> </li>
<li><t>The Chapter String Element (<xref target="chapstring-element"></xref>) co rresponds to a tag with the TagChapterUID (<xref target="tagchapteruid-element"> </xref>) set to the same chapter UID, a TagName of <tt>TITLE</tt> (<xref target= "tagname-element"></xref>) and a TagLanguage (<xref target="taglanguage-element" ></xref>) or TagLanguageBCP47 (<xref target="taglanguagebcp47-element"></xref>) matching the ChapLanguage (<xref target="chaplanguage-element"></xref>) or ChapL anguageBCP47 (<xref target="chaplanguagebcp47-element"></xref>) respectively.</t > <li><t>The <tt>ChapString</tt> Element (<xref target="chapstring-element"></xref >) corresponds to a tag with the <tt>TagChapterUID</tt> (<xref target="tagchapte ruid-element"></xref>) set to the same chapter UID, a <tt>TagName</tt> of <tt>TI TLE</tt> (<xref target="tagname-element"></xref>), and a <tt>TagLanguage</tt> (< xref target="taglanguage-element"></xref>) or <tt>TagLanguageBCP47</tt> (<xref t arget="taglanguagebcp47-element"></xref>) matching the <tt>ChapLanguage</tt> (<x ref target="chaplanguage-element"></xref>) or <tt>ChapLanguageBCP47</tt> (<xref target="chaplanguagebcp47-element"></xref>), respectively.</t>
</li> </li>
<li><t>The FileDescription Element (<xref target="filedescription-element"></xre f>) of an attachment corresponds to a tag with the TagAttachmentUID (<xref targe t="tagattachmentuid-element"></xref>) set to the given attachment, a TagName of <tt>TITLE</tt> (<xref target="tagname-element"></xref>) and a TagLanguage (<xref target="taglanguage-element"></xref>) or TagLanguageBCP47 (<xref target="taglan guagebcp47-element"></xref>) of &quot;und&quot;.</t> <li><t>The <tt>FileDescription</tt> Element (<xref target="filedescription-eleme nt"></xref>) of an attachment corresponds to a tag with the <tt>TagAttachmentUID </tt> (<xref target="tagattachmentuid-element"></xref>) set to the given attachm ent, a <tt>TagName</tt> of <tt>TITLE</tt> (<xref target="tagname-element"></xref >), and a <tt>TagLanguage</tt> (<xref target="taglanguage-element"></xref>) or < tt>TagLanguageBCP47</tt> (<xref target="taglanguagebcp47-element"></xref>) of "u nd".</t>
</li> </li>
</ul> </ul>
<t>When both values exist in the file, the value found in Tags takes precedence <t>When both values exist in the file, the value found in Tags takes precedence
over the value found in original location of the element. over the value found in the original location of the element.
For example, if you have a <tt>TrackEntry\Name</tt> element and Tag <tt>TITLE</t For example, if you have a <tt>TrackEntry\Name</tt> element and Tag <tt>TITLE</t
t> for that track in a Matroska Segment, the Tag string <bcp14>SHOULD</bcp14> be t> for that track in a Matroska <tt>Segment</tt>, the Tag string <bcp14>SHOULD</
used and not the <tt>TrackEntry\Name</tt> string to identify the track.</t> bcp14> be used instead of the <tt>TrackEntry\Name</tt> string to identify the tr
ack.</t>
<t>As the Tag element is optional, a lot of <tt>Matroska Readers</tt> do not han dle it and will not use the tags value when it's found. <t>As the Tag element is optional, a lot of <tt>Matroska Readers</tt> do not han dle it and will not use the tags value when it's found.
So for maximum compatibility, it's usually better to put the strings in the <tt> TrackEntry</tt>, <tt>ChapterAtom</tt> and <tt>Attachment</tt> Thus, for maximum compatibility, it's usually better to put the strings in the < tt>TrackEntry</tt>, <tt>ChapterAtom</tt>, and <tt>Attachments Element</tt>
and keep the tags matching these values if tags are also used.</t> and keep the tags matching these values if tags are also used.</t>
</section> </section>
<section anchor="tag-levels"><name>Tag Levels</name> <section anchor="tag-levels"><name>Tag Levels</name>
<t>Tag elements allow tagging information on multiple levels, each level having a <tt>TargetTypeValue</tt> <xref target="targettypevalue-element"></xref>. <t>Tag elements allow tagging information on multiple levels, with each level ha ving a <tt>TargetTypeValue</tt> <xref target="targettypevalue-element"></xref>.
An element for a given <tt>TargetTypeValue</tt> also applies to the lower levels denoted by smaller <tt>TargetTypeValue</tt> values. If an upper value An element for a given <tt>TargetTypeValue</tt> also applies to the lower levels denoted by smaller <tt>TargetTypeValue</tt> values. If an upper value
doesn't apply to a level but the actual value to use is not known, doesn't apply to a level but the actual value to use is not known,
an empty <tt>TagString</tt> (<xref target="tagstring-element"></xref>) or an emp an empty <tt>TagString</tt> (<xref target="tagstring-element"></xref>) or an emp
ty <tt>TagBinary</tt> (<xref target="tagbinary-element"></xref>) element <bcp14> ty <tt>TagBinary</tt> (<xref target="tagbinary-element"></xref>) <bcp14>MUST</bc
MUST</bcp14> be used as the tag value for this level.</t> p14> be used as the tag value for this level.</t>
<t>See <xref target="MatroskaTags"></xref> for more details on common tag names, <t>See <xref target="I-D.ietf-cellar-tags"></xref> for more details on common ta
types and descriptions.</t> g names, types, and descriptions.</t>
</section> </section>
</section> </section>
<section anchor="implementation-recommendations"><name>Implementation Recommenda tions</name> <section anchor="implementation-recommendations"><name>Implementation Recommenda tions</name>
<section anchor="cluster"><name>Cluster</name> <section anchor="cluster"><name>Cluster</name>
<t>It is <bcp14>RECOMMENDED</bcp14> that each individual <tt>Cluster Element</tt <t>It is <bcp14>RECOMMENDED</bcp14> that each individual <tt>Cluster Element</tt
> contains no more than > contain no more than
5 seconds or 5 megabytes of content.</t> five seconds or five megabytes of content.</t>
</section> </section>
<section anchor="seekhead-1"><name>SeekHead</name> <section anchor="seekhead-1"><name>SeekHead</name>
<t>It is <bcp14>RECOMMENDED</bcp14> that the first <tt>SeekHead Element</tt> be followed by a <tt>Void Element</tt> to <t>It is <bcp14>RECOMMENDED</bcp14> that the first <tt>SeekHead Element</tt> be followed by a <tt>Void Element</tt> to
allow for the <tt>SeekHead Element</tt> to be expanded to cover new <tt>Top-Leve l Elements</tt> allow for the <tt>SeekHead Element</tt> to be expanded to cover new <tt>Top-Leve l Elements</tt>
that could be added to the Matroska file, such as <tt>Tags</tt>, <tt>Chapters</t t>, and <tt>Attachments</tt> Elements.</t> that could be added to the Matroska file, such as <tt>Tags</tt>, <tt>Chapters</t t>, and <tt>Attachments</tt> Elements.</t>
<t>The size of this <tt>Void Element</tt> should be adjusted depending on the Ma <t>The size of this <tt>Void Element</tt> should be adjusted depending on the <t
troska file already having t>Tags</tt>,
<tt>Tags</tt>, <tt>Chapters</tt>, and <tt>Attachments</tt> Elements.</t> <tt>Chapters</tt>, and <tt>Attachments</tt> Elements in the Matroska file.</t>
</section> </section>
<section anchor="optimum-layouts"><name>Optimum Layouts</name> <section anchor="optimum-layouts"><name>Optimum Layouts</name>
<t>While there can be <tt>Top-Level Elements</tt> in any order, some ordering of <t>While there can be <tt>Top-Level Elements</tt> in any order, some orderings o
Elements are better than others. f Elements are better than others.
Here are few optimum layouts for different use case:</t> The following subsections detail optimum layouts for different use cases.</t>
<section anchor="optimum-layout-for-a-muxer"><name>Optimum layout for a muxer</n <section anchor="optimum-layout-for-a-muxer"><name>Optimum Layout for a Muxer</n
ame> ame>
<t>This is the basic layout muxers should be using for an efficient playback exp <t>This is the basic layout muxers should be using for an efficient playback exp
erience.</t> erience:</t>
<ul spacing="compact"> <ul spacing="compact">
<li>SeekHead</li> <li><tt>SeekHead</tt></li>
<li>Info</li> <li><tt>Info</tt></li>
<li>Tracks</li> <li><tt>Tracks</tt></li>
<li>Chapters</li> <li><tt>Chapters</tt></li>
<li>Attachments</li> <li><tt>Attachments</tt></li>
<li>Tags</li> <li><tt>Tags</tt></li>
<li>Clusters</li> <li><tt>Clusters</tt></li>
<li>Cues</li> <li><tt>Cues</tt></li>
</ul> </ul>
</section> </section>
<section anchor="optimum-layout-after-editing-tags"><name>Optimum layout after e diting tags</name> <section anchor="optimum-layout-after-editing-tags"><name>Optimum Layout after E diting Tags</name>
<t>When tags from the previous layout need to be extended, they are moved to the end with the extra information. <t>When tags from the previous layout need to be extended, they are moved to the end with the extra information.
The location where the old tags were located is voided.</t> The location where the old tags were located is voided.</t>
<ul spacing="compact"> <ul spacing="compact">
<li>SeekHead</li> <li><tt>SeekHead</tt></li>
<li>Info</li> <li><tt>Info</tt></li>
<li>Tracks</li> <li><tt>Tracks</tt></li>
<li>Chapters</li> <li><tt>Chapters</tt></li>
<li>Attachments</li> <li><tt>Attachments</tt></li>
<li>Void</li> <li><tt>Void</tt></li>
<li>Clusters</li> <li><tt>Clusters</tt></li>
<li>Cues</li> <li><tt>Cues</tt></li>
<li>Tags</li> <li><tt>Tags</tt></li>
</ul> </ul>
</section> </section>
<section anchor="optimum-layout-with-cues-at-the-front"><name>Optimum layout wit <section anchor="optimum-layout-with-cues-at-the-front"><name>Optimum Layout wit
h Cues at the front</name> h Cues at the Front</name>
<t>Cues are usually a big chunk of data referencing a lot of locations in the fi <t><tt>Cues</tt> are usually a big chunk of data referencing a lot of locations
le. in the file.
For players that want to seek in the file they need to seek to the end of the fi Players that want to seek in the file need to seek to the end of the file
le
to access these locations. It is often better if they are placed early in the fi le. to access these locations. It is often better if they are placed early in the fi le.
On the other hand that means players that don't intend to seek will have to read /skip On the other hand, that means players that don't intend to seek will have to rea d/skip
these data no matter what.</t> these data no matter what.</t>
<t>Because the Cues reference locations further in the file, it's often complica ted to <t>Because the <tt>Cues</tt> reference locations further in the file, it's often complicated to
allocate the proper space for that element before all the locations are known. allocate the proper space for that element before all the locations are known.
Therefore, this layout is rarely used.</t> Therefore, this layout is rarely used:</t>
<ul spacing="compact"> <ul spacing="compact">
<li>SeekHead</li> <li><tt>SeekHead</tt></li>
<li>Info</li> <li><tt>Info</tt></li>
<li>Tracks</li> <li><tt>Tracks</tt></li>
<li>Chapters</li> <li><tt>Chapters</tt></li>
<li>Attachments</li> <li><tt>Attachments</tt></li>
<li>Tags</li> <li><tt>Tags</tt></li>
<li>Cues</li> <li><tt>Cues</tt></li>
<li>Clusters</li> <li><tt>Clusters</tt></li>
</ul> </ul>
</section> </section>
<section anchor="optimum-layout-for-livestreaming"><name>Optimum layout for live <section anchor="optimum-layout-for-livestreaming"><name>Optimum Layout for Live
streaming</name> streaming</name>
<t>In Livestreaming (<xref target="livestreaming"></xref>) only a few elements m <t>In livestreaming (<xref target="livestreaming"></xref>), only a few elements
ake sense. SeekHead and Cues are useless for example. make sense. For example, <tt>SeekHead</tt> and <tt>Cues</tt> are useless.
All elements other than the Clusters <bcp14>MUST</bcp14> be placed before the Cl All elements other than the <tt>Clusters</tt> <bcp14>MUST</bcp14> be placed befo
usters.</t> re the <tt>Clusters</tt>.</t>
<ul spacing="compact"> <ul spacing="compact">
<li>Info</li> <li><tt>Info</tt></li>
<li>Tracks</li> <li><tt>Tracks</tt></li>
<li>Attachments (rare)</li> <li><tt>Attachments</tt> (rare)</li>
<li>Tags</li> <li><tt>Tags</tt></li>
<li>Clusters</li> <li><tt>Clusters</tt></li>
</ul> </ul>
</section> </section>
</section> </section>
</section> </section>
<section anchor="security-considerations"><name>Security Considerations</name> <section anchor="security-considerations"><name>Security Considerations</name>
<t>Matroska inherits security considerations from EBML.</t> <t>Matroska inherits security considerations from EBML <xref target="RFC8794"/>.
<t>Attacks on a <tt>Matroska Reader</tt> could include:</t> </t>
<t>Attacks on a Matroska Reader could include:</t>
<ul> <ul>
<li><t>Storage of an arbitrary and potentially executable data within an <tt>Att <li><t>Storage of an arbitrary and potentially executable data within an <tt>Att
achment Element</tt>. achments Element</tt>.
<tt>Matroska Readers</tt> that extract or use data from Matroska Attachments <bc <tt>Matroska Readers</tt> that extract or use data from <tt>Matroska Attachments
p14>SHOULD</bcp14> </tt> <bcp14>SHOULD</bcp14>
check that the data adheres to expectations or not use the attachement.</t> check that the data adheres to expectations or not use the attachment.</t>
</li> </li>
<li><t>A <tt>Matroska Attachment</tt> with an inaccurate media type.</t> <li><t>A <tt>Matroska Attachment</tt> with an inaccurate media type.</t>
</li> </li>
<li><t>Damage to the Encryption and Compression fields (<xref target="encryption "></xref>) that would result in bogus binary data <li><t>Damage to the Encryption and Compression fields (<xref target="encryption "></xref>) that would result in bogus binary data
interpreted by the decoder.</t> interpreted by the decoder.</t>
</li> </li>
<li><t>Chapter Codecs running unwanted commands on the host system.</t> <li><t>Chapter Codecs running unwanted commands on the host system.</t>
</li> </li>
</ul> </ul>
<t>The same error handling done for EBML applies to Matroska files. <t>The same error handling done for EBML applies to Matroska files.
Particular error handling is not covered in this specification as this is depend Particular error handling is not covered in this specification, as this is
s on the goal of the <tt>Matroska Readers</tt>. depends on the goal of the <tt>Matroska Readers</tt>. <tt>Matroska
It is up to the decision of the <tt>Matroska Readers</tt> on how to handle the e Readers</tt> decide how to handle the errors whether or not they are
rrors if they are recoverable in their code or not. recoverable in their code.
For example, if the checksum of the <tt>\Segment\Tracks</tt> is invalid some cou For example, if the checksum of the <tt>\Segment\Tracks</tt> is invalid, some
ld decide to try to read the data anyway, could decide to try to read the data anyway, some will just reject the file,
some will just reject the file, most will not even check it.</t> and most will not even check it.</t>
<t><tt>Matroska Reader</tt> implementations need to be robust against malicious <t>Matroska Reader implementations need to be robust against malicious payloads.
payloads. Those related to denial of service are outlined in <xref target="RFC4732" secti
Those related to denial of service are outlined in Section 2.1 of [RFC4732].<br onFormat="of" section="2.1"/>.</t>
/>
Although rarer, the same may apply to a <tt>Matroska Writer</tt>. Malicious str <t>Although rarer, the same may apply to a Matroska Writer. Malicious stream da
eam data ta
must not cause the Writer to misbehave, as this might allow an attacker access must not cause the Matroska Writer to misbehave, as this might allow an attacker
access
to transcoding gateways.</t> to transcoding gateways.</t>
<t>As an audio and visual container format, a Matroska file or stream will
<t>As an audio/video container format, a Matroska file or stream will
potentially encapsulate numerous byte streams created with a variety of potentially encapsulate numerous byte streams created with a variety of
codecs. Implementers will need to consider the security considerations of codecs. Implementers will need to consider the security considerations of
these encapsulated formats.</t> these encapsulated formats.</t>
</section> </section>
<section anchor="iana-considerations"><name>IANA Considerations</name> <section anchor="iana-considerations"><name>IANA Considerations</name>
<!-- [rfced]
g) Section 27.2 notes this:
Original:
The values correspond to the unsigned
integer ChapProcessCodecID value described in Section 5.1.7.1.4.15.
...
ChapProcessCodecID values of "0" and "1" are RESERVED to the IETF for
future use.
Values 0 and 1 in the registry are listed as Reserved, with this document as a
reference. See
https://www.iana.org/assignments/matroska/matroska.xhtml#matroska-chapter-codec-
ids.
However, Section 5.1.7.1.4.15 notes this about values "0" and "1" for ChapProces
sCodecID:
Original:
definition: Contains the type of the codec used for the processing.
A value of 0 means built-in Matroska processing (to be defined), a
value of 1 means the DVD command set is used; see Section 20.3 on
DVD menus. More codec IDs can be added later.
Please review and let us know if any updates are needed.
-->
<!-- [cellar] values 0 and 1 are indeed for Matroska Script and DVD-Menu.
Should we update the text in this document to reflect that, given the IANA doesn
't have the names yet ?
The IANA will be update the names when the chapter-codec document is finalized,
but should it be done before ? -->
<section anchor="matroska-element-ids-registry"><name>Matroska Element IDs Regis try</name> <section anchor="matroska-element-ids-registry"><name>Matroska Element IDs Regis try</name>
<t>This document creates a new IANA registry called the &quot;Matroska Element I Ds&quot; <t>IANA has created a new registry called the "Matroska Element IDs"
registry.</t> registry.</t>
<t>To register a new Element ID in this registry, one needs an Element ID, <t>To register a new Element ID in this registry, one needs an Element ID, an
a Change Controller (IETF or email of registrant) and Element Name, a Change Controller (IETF or email of registrant), and an
an optional Reference to a document describing the Element ID.</t> optional Reference to a document describing the Element ID.</t>
<t>Element IDs are encoded <t>Element IDs are encoded
using the VINT mechanism described in Section 4 of <xref target="RFC8794"></xref using the VINT mechanism described in <xref target="RFC8794" sectionFormat="of"
> and can be between section="4"></xref> and can be between
one and five octets long. Five-octet-long Element IDs are possible one and five octets long. Five-octet Element IDs are possible
only if declared in the EBML header.</t> only if declared in the EBML Header.</t>
<t>Element IDs are described in Section 5 of <xref target="RFC8794"></xref> with <t>Element IDs are described in <xref target="RFC8794" sectionFormat="of" sectio
errata 7189 and 7191.</t> n="5"></xref>, with the changes in <xref target="Err7189"/> and <xref target="Er
<t>One-octet Matroska Element IDs are to be allocated according to the &quot;RFC r7191"/>.</t>
Required&quot; policy <xref target="RFC8126"></xref>.</t> <t>One-octet Matroska Element IDs (range 0x00-0xFF) are to be allocated accordin
<t>Two-octet Matroska Element IDs are to be allocated according to the &quot;Spe g to the "RFC Required" policy <xref target="RFC8126"></xref>.</t>
cification Required&quot; policy <xref target="RFC8126"></xref>.</t> <t>Two-octet Matroska Element IDs (range 0x0100-0xFFFF) are to be allocated acco
<t>Three-octet and four-octet Matroska Element IDs are to be allocated according rding to the "Specification Required" policy <xref target="RFC8126"></xref>.</t>
to the &quot;First Come First Served&quot; policy <xref target="RFC8126"></xref <t>Three-octet and four-octet Matroska Element IDs (range 0x00010000-0xFFFFFFFF)
>.</t> are to be allocated according to the "First Come First Served" policy <xref tar
<t>The allowed values in the Elements IDs registry are similar to the ones found get="RFC8126"></xref>.</t>
in the EBML Element IDs registry defined in Section 17.1 of <xref target="RFC879 <t>The allowed values in the "Matroska Element IDs" registry are similar to the
4"></xref>.</t> ones found
<t>EBML IDs defined for the EBML Header -- as defined in Section 17.1 of <xref t in the "EBML Element IDs" registry defined in <xref target="RFC8794" sectionForm
arget="RFC8794"></xref> -- at="of" section="17.1"></xref>.</t>
<bcp14>MUST NOT</bcp14> be used as Matroska Element IDs.</t> <t>EBML Element IDs defined for the EBML Header -- as defined in <xref target="R
<t>Given the scarcity of the One-octet Element IDs, they should only be created FC8794" sectionFormat="of" section="17.1"></xref> -- <bcp14>MUST NOT</bcp14> be
to save space for elements found many times in a file. used as Matroska Element IDs.</t>
For example, within a BlockGroup or Chapters. The Four-octet Element IDs are mos
tly for synchronization of large elements. <t>Given the scarcity of one-octet Element IDs, they should only be created
They should only be used for such high level elements. to save space for elements found many times in a file (for example, <tt>BlockGro
Elements that are not expected to be used often should use Three-octet Element I up</tt>
Ds.</t> or <tt>Chapters</tt>). The four-octet Element IDs are mostly for synchronization
<t>Elements found in <xref target="annex-a-historic-deprecated-elements"></xref> of
have an assigned Matroska Element ID for historical reasons. large elements. They should only be used for such high-level elements.
These elements are not in use and <bcp14>SHOULD NOT</bcp14> be reused unless the Elements that are not expected to be used often should use three-octet Element
re is no other IDs available with the desired size. IDs.</t>
Such IDs are considered as <tt>reclaimed</tt> to the IANA registry as they could <t>Elements found in <xref target="appendix-a-historic-deprecated-elements"></xr
be used for other things in the future.</t> ef> have an assigned Matroska Element ID for historical reasons.
<t>Matroska Element IDs Values found in this document are assigned as initial va These elements are not in use and <bcp14>SHOULD NOT</bcp14> be reused unless the
lues as follows:</t> re are no other IDs available with the desired size.
<table><name>IDs and Names for Matroska Element IDs assigned by this document Such IDs are marked as "Reclaimed" in the "Matroska Element IDs" registry, as th
ey could be used for other things in the future.</t>
<t><xref target="iana-table"></xref> shows the initial contents of the
"Matroska Element IDs" registry. Note that the Change Controller for all
entries in <xref target="iana-table"/> is "IETF".</t>
<table anchor="iana-table"><name>Initial Contents of "Matroska Element IDs" Regi
stry
</name> </name>
<thead> <thead>
<tr> <tr>
<th align="right">Element ID</th> <th align="right">Element ID</th>
<th align="left">Element Name</th> <th align="left">Element Name</th>
<th align="left">Reference</th> <th align="left">Reference</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="right">0x80</td> <td align="right">0x80</td>
<td align="left">ChapterDisplay</td> <td align="left">ChapterDisplay</td>
<td align="left">Described in <xref target="chapterdisplay-element"></xref></td> <td align="left">RFC 9559, <xref target="chapterdisplay-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x83</td> <td align="right">0x83</td>
<td align="left">TrackType</td> <td align="left">TrackType</td>
<td align="left">Described in <xref target="tracktype-element"></xref></td> <td align="left">RFC 9559, <xref target="tracktype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x85</td> <td align="right">0x85</td>
<td align="left">ChapString</td> <td align="left">ChapString</td>
<td align="left">Described in <xref target="chapstring-element"></xref></td> <td align="left">RFC 9559, <xref target="chapstring-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x86</td> <td align="right">0x86</td>
<td align="left">CodecID</td> <td align="left">CodecID</td>
<td align="left">Described in <xref target="codecid-element"></xref></td> <td align="left">RFC 9559, <xref target="codecid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x88</td> <td align="right">0x88</td>
<td align="left">FlagDefault</td> <td align="left">FlagDefault</td>
<td align="left">Described in <xref target="flagdefault-element"></xref></td> <td align="left">RFC 9559, <xref target="flagdefault-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x8E</td> <td align="right">0x8E</td>
<td align="left">Slices</td> <td align="left">Slices</td>
<td align="left">Reclaimed (<xref target="slices-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="slices-element"></xref>)</td >
</tr> </tr>
<tr> <tr>
<td align="right">0x91</td> <td align="right">0x91</td>
<td align="left">ChapterTimeStart</td> <td align="left">ChapterTimeStart</td>
<td align="left">Described in <xref target="chaptertimestart-element"></xref></t d> <td align="left">RFC 9559, <xref target="chaptertimestart-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x92</td> <td align="right">0x92</td>
<td align="left">ChapterTimeEnd</td> <td align="left">ChapterTimeEnd</td>
<td align="left">Described in <xref target="chaptertimeend-element"></xref></td> <td align="left">RFC 9559, <xref target="chaptertimeend-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x96</td> <td align="right">0x96</td>
<td align="left">CueRefTime</td> <td align="left">CueRefTime</td>
<td align="left">Described in <xref target="cuereftime-element"></xref></td> <td align="left">RFC 9559, <xref target="cuereftime-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x97</td> <td align="right">0x97</td>
<td align="left">CueRefCluster</td> <td align="left">CueRefCluster</td>
<td align="left">Reclaimed (<xref target="cuerefcluster-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="cuerefcluster-element"></xre f>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x98</td> <td align="right">0x98</td>
<td align="left">ChapterFlagHidden</td> <td align="left">ChapterFlagHidden</td>
<td align="left">Described in <xref target="chapterflaghidden-element"></xref></ td> <td align="left">RFC 9559, <xref target="chapterflaghidden-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x9A</td> <td align="right">0x9A</td>
<td align="left">FlagInterlaced</td> <td align="left">FlagInterlaced</td>
<td align="left">Described in <xref target="flaginterlaced-element"></xref></td> <td align="left">RFC 9559, <xref target="flaginterlaced-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x9B</td> <td align="right">0x9B</td>
<td align="left">BlockDuration</td> <td align="left">BlockDuration</td>
<td align="left">Described in <xref target="blockduration-element"></xref></td> <td align="left">RFC 9559, <xref target="blockduration-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x9C</td> <td align="right">0x9C</td>
<td align="left">FlagLacing</td> <td align="left">FlagLacing</td>
<td align="left">Described in <xref target="flaglacing-element"></xref></td> <td align="left">RFC 9559, <xref target="flaglacing-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x9D</td> <td align="right">0x9D</td>
<td align="left">FieldOrder</td> <td align="left">FieldOrder</td>
<td align="left">Described in <xref target="fieldorder-element"></xref></td> <td align="left">RFC 9559, <xref target="fieldorder-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x9F</td> <td align="right">0x9F</td>
<td align="left">Channels</td> <td align="left">Channels</td>
<td align="left">Described in <xref target="channels-element"></xref></td> <td align="left">RFC 9559, <xref target="channels-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA0</td> <td align="right">0xA0</td>
<td align="left">BlockGroup</td> <td align="left">BlockGroup</td>
<td align="left">Described in <xref target="blockgroup-element"></xref></td> <td align="left">RFC 9559, <xref target="blockgroup-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA1</td> <td align="right">0xA1</td>
<td align="left">Block</td> <td align="left">Block</td>
<td align="left">Described in <xref target="block-element"></xref></td> <td align="left">RFC 9559, <xref target="block-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA2</td> <td align="right">0xA2</td>
<td align="left">BlockVirtual</td> <td align="left">BlockVirtual</td>
<td align="left">Reclaimed (<xref target="blockvirtual-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="blockvirtual-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA3</td> <td align="right">0xA3</td>
<td align="left">SimpleBlock</td> <td align="left">SimpleBlock</td>
<td align="left">Described in <xref target="simpleblock-element"></xref></td> <td align="left">RFC 9559, <xref target="simpleblock-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA4</td> <td align="right">0xA4</td>
<td align="left">CodecState</td> <td align="left">CodecState</td>
<td align="left">Described in <xref target="codecstate-element"></xref></td> <td align="left">RFC 9559, <xref target="codecstate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA5</td> <td align="right">0xA5</td>
<td align="left">BlockAdditional</td> <td align="left">BlockAdditional</td>
<td align="left">Described in <xref target="blockadditional-element"></xref></td > <td align="left">RFC 9559, <xref target="blockadditional-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA6</td> <td align="right">0xA6</td>
<td align="left">BlockMore</td> <td align="left">BlockMore</td>
<td align="left">Described in <xref target="blockmore-element"></xref></td> <td align="left">RFC 9559, <xref target="blockmore-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA7</td> <td align="right">0xA7</td>
<td align="left">Position</td> <td align="left">Position</td>
<td align="left">Described in <xref target="position-element"></xref></td> <td align="left">RFC 9559, <xref target="position-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xAA</td> <td align="right">0xAA</td>
<td align="left">CodecDecodeAll</td> <td align="left">CodecDecodeAll</td>
<td align="left">Reclaimed (<xref target="codecdecodeall-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="codecdecodeall-element"></xr ef>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xAB</td> <td align="right">0xAB</td>
<td align="left">PrevSize</td> <td align="left">PrevSize</td>
<td align="left">Described in <xref target="prevsize-element"></xref></td> <td align="left">RFC 9559, <xref target="prevsize-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xAE</td> <td align="right">0xAE</td>
<td align="left">TrackEntry</td> <td align="left">TrackEntry</td>
<td align="left">Described in <xref target="trackentry-element"></xref></td> <td align="left">RFC 9559, <xref target="trackentry-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xAF</td> <td align="right">0xAF</td>
<td align="left">EncryptedBlock</td> <td align="left">EncryptedBlock</td>
<td align="left">Reclaimed (<xref target="encryptedblock-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="encryptedblock-element"></xr ef>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB0</td> <td align="right">0xB0</td>
<td align="left">PixelWidth</td> <td align="left">PixelWidth</td>
<td align="left">Described in <xref target="pixelwidth-element"></xref></td> <td align="left">RFC 9559, <xref target="pixelwidth-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB2</td> <td align="right">0xB2</td>
<td align="left">CueDuration</td> <td align="left">CueDuration</td>
<td align="left">Described in <xref target="cueduration-element"></xref></td> <td align="left">RFC 9559, <xref target="cueduration-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB3</td> <td align="right">0xB3</td>
<td align="left">CueTime</td> <td align="left">CueTime</td>
<td align="left">Described in <xref target="cuetime-element"></xref></td> <td align="left">RFC 9559, <xref target="cuetime-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB5</td> <td align="right">0xB5</td>
<td align="left">SamplingFrequency</td> <td align="left">SamplingFrequency</td>
<td align="left">Described in <xref target="samplingfrequency-element"></xref></ td> <td align="left">RFC 9559, <xref target="samplingfrequency-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB6</td> <td align="right">0xB6</td>
<td align="left">ChapterAtom</td> <td align="left">ChapterAtom</td>
<td align="left">Described in <xref target="chapteratom-element"></xref></td> <td align="left">RFC 9559, <xref target="chapteratom-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB7</td> <td align="right">0xB7</td>
<td align="left">CueTrackPositions</td> <td align="left">CueTrackPositions</td>
<td align="left">Described in <xref target="cuetrackpositions-element"></xref></ td> <td align="left">RFC 9559, <xref target="cuetrackpositions-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB9</td> <td align="right">0xB9</td>
<td align="left">FlagEnabled</td> <td align="left">FlagEnabled</td>
<td align="left">Described in <xref target="flagenabled-element"></xref></td> <td align="left">RFC 9559, <xref target="flagenabled-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xBA</td> <td align="right">0xBA</td>
<td align="left">PixelHeight</td> <td align="left">PixelHeight</td>
<td align="left">Described in <xref target="pixelheight-element"></xref></td> <td align="left">RFC 9559, <xref target="pixelheight-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xBB</td> <td align="right">0xBB</td>
<td align="left">CuePoint</td> <td align="left">CuePoint</td>
<td align="left">Described in <xref target="cuepoint-element"></xref></td> <td align="left">RFC 9559, <xref target="cuepoint-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC0</td> <td align="right">0xC0</td>
<td align="left">TrickTrackUID</td> <td align="left">TrickTrackUID</td>
<td align="left">Reclaimed (<xref target="tricktrackuid-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="tricktrackuid-element"></xre f>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC1</td> <td align="right">0xC1</td>
<td align="left">TrickTrackSegmentUID</td> <td align="left">TrickTrackSegmentUID</td>
<td align="left">Reclaimed (<xref target="tricktracksegmentuid-element"></xref>) </td> <td align="left">Reclaimed (RFC 9559, <xref target="tricktracksegmentuid-element "></xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC4</td> <td align="right">0xC4</td>
<td align="left">TrickMasterTrackSegmentUID</td> <td align="left">TrickMasterTrackSegmentUID</td>
<td align="left">Reclaimed (<xref target="trickmastertracksegmentuid-element"></ xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="trickmastertracksegmentuid-e lement"></xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC6</td> <td align="right">0xC6</td>
<td align="left">TrickTrackFlag</td> <td align="left">TrickTrackFlag</td>
<td align="left">Reclaimed (<xref target="tricktrackflag-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="tricktrackflag-element"></xr ef>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC7</td> <td align="right">0xC7</td>
<td align="left">TrickMasterTrackUID</td> <td align="left">TrickMasterTrackUID</td>
<td align="left">Reclaimed (<xref target="trickmastertrackuid-element"></xref>)< /td> <td align="left">Reclaimed (RFC 9559, <xref target="trickmastertrackuid-element" ></xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC8</td> <td align="right">0xC8</td>
<td align="left">ReferenceFrame</td> <td align="left">ReferenceFrame</td>
<td align="left">Reclaimed (<xref target="referenceframe-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="referenceframe-element"></xr ef>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC9</td> <td align="right">0xC9</td>
<td align="left">ReferenceOffset</td> <td align="left">ReferenceOffset</td>
<td align="left">Reclaimed (<xref target="referenceoffset-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="referenceoffset-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCA</td> <td align="right">0xCA</td>
<td align="left">ReferenceTimestamp</td> <td align="left">ReferenceTimestamp</td>
<td align="left">Reclaimed (<xref target="referencetimestamp-element"></xref>)</ td> <td align="left">Reclaimed (RFC 9559, <xref target="referencetimestamp-element"> </xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCB</td> <td align="right">0xCB</td>
<td align="left">BlockAdditionID</td> <td align="left">BlockAdditionID</td>
<td align="left">Reclaimed (<xref target="blockadditionid-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="blockadditionid-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCC</td> <td align="right">0xCC</td>
<td align="left">LaceNumber</td> <td align="left">LaceNumber</td>
<td align="left">Reclaimed (<xref target="lacenumber-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="lacenumber-element"></xref>) </td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCD</td> <td align="right">0xCD</td>
<td align="left">FrameNumber</td> <td align="left">FrameNumber</td>
<td align="left">Reclaimed (<xref target="framenumber-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="framenumber-element"></xref> )</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCE</td> <td align="right">0xCE</td>
<td align="left">Delay</td> <td align="left">Delay</td>
<td align="left">Reclaimed (<xref target="delay-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="delay-element"></xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCF</td> <td align="right">0xCF</td>
<td align="left">SliceDuration</td> <td align="left">SliceDuration</td>
<td align="left">Reclaimed (<xref target="sliceduration-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="sliceduration-element"></xre f>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xD7</td> <td align="right">0xD7</td>
<td align="left">TrackNumber</td> <td align="left">TrackNumber</td>
<td align="left">Described in <xref target="tracknumber-element"></xref></td> <td align="left">RFC 9559, <xref target="tracknumber-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xDB</td> <td align="right">0xDB</td>
<td align="left">CueReference</td> <td align="left">CueReference</td>
<td align="left">Described in <xref target="cuereference-element"></xref></td> <td align="left">RFC 9559, <xref target="cuereference-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE0</td> <td align="right">0xE0</td>
<td align="left">Video</td> <td align="left">Video</td>
<td align="left">Described in <xref target="video-element"></xref></td> <td align="left">RFC 9559, <xref target="video-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE1</td> <td align="right">0xE1</td>
<td align="left">Audio</td> <td align="left">Audio</td>
<td align="left">Described in <xref target="audio-element"></xref></td> <td align="left">RFC 9559, <xref target="audio-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE2</td> <td align="right">0xE2</td>
<td align="left">TrackOperation</td> <td align="left">TrackOperation</td>
<td align="left">Described in <xref target="trackoperation-element"></xref></td> <td align="left">RFC 9559, <xref target="trackoperation-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE3</td> <td align="right">0xE3</td>
<td align="left">TrackCombinePlanes</td> <td align="left">TrackCombinePlanes</td>
<td align="left">Described in <xref target="trackcombineplanes-element"></xref>< /td> <td align="left">RFC 9559, <xref target="trackcombineplanes-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0xE4</td> <td align="right">0xE4</td>
<td align="left">TrackPlane</td> <td align="left">TrackPlane</td>
<td align="left">Described in <xref target="trackplane-element"></xref></td> <td align="left">RFC 9559, <xref target="trackplane-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE5</td> <td align="right">0xE5</td>
<td align="left">TrackPlaneUID</td> <td align="left">TrackPlaneUID</td>
<td align="left">Described in <xref target="trackplaneuid-element"></xref></td> <td align="left">RFC 9559, <xref target="trackplaneuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE6</td> <td align="right">0xE6</td>
<td align="left">TrackPlaneType</td> <td align="left">TrackPlaneType</td>
<td align="left">Described in <xref target="trackplanetype-element"></xref></td> <td align="left">RFC 9559, <xref target="trackplanetype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE7</td> <td align="right">0xE7</td>
<td align="left">Timestamp</td> <td align="left">Timestamp</td>
<td align="left">Described in <xref target="timestamp-element"></xref></td> <td align="left">RFC 9559, <xref target="timestamp-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE8</td> <td align="right">0xE8</td>
<td align="left">TimeSlice</td> <td align="left">TimeSlice</td>
<td align="left">Reclaimed (<xref target="timeslice-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="timeslice-element"></xref>)< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE9</td> <td align="right">0xE9</td>
<td align="left">TrackJoinBlocks</td> <td align="left">TrackJoinBlocks</td>
<td align="left">Described in <xref target="trackjoinblocks-element"></xref></td > <td align="left">RFC 9559, <xref target="trackjoinblocks-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xEA</td> <td align="right">0xEA</td>
<td align="left">CueCodecState</td> <td align="left">CueCodecState</td>
<td align="left">Described in <xref target="cuecodecstate-element"></xref></td> <td align="left">RFC 9559, <xref target="cuecodecstate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xEB</td> <td align="right">0xEB</td>
<td align="left">CueRefCodecState</td> <td align="left">CueRefCodecState</td>
<td align="left">Reclaimed (<xref target="cuerefcodecstate-element"></xref>)</td > <td align="left">Reclaimed (RFC 9559, <xref target="cuerefcodecstate-element"></ xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xED</td> <td align="right">0xED</td>
<td align="left">TrackJoinUID</td> <td align="left">TrackJoinUID</td>
<td align="left">Described in <xref target="trackjoinuid-element"></xref></td> <td align="left">RFC 9559, <xref target="trackjoinuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xEE</td> <td align="right">0xEE</td>
<td align="left">BlockAddID</td> <td align="left">BlockAddID</td>
<td align="left">Described in <xref target="blockaddid-element"></xref></td> <td align="left">RFC 9559, <xref target="blockaddid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xF0</td> <td align="right">0xF0</td>
<td align="left">CueRelativePosition</td> <td align="left">CueRelativePosition</td>
<td align="left">Described in <xref target="cuerelativeposition-element"></xref> </td> <td align="left">RFC 9559, <xref target="cuerelativeposition-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0xF1</td> <td align="right">0xF1</td>
<td align="left">CueClusterPosition</td> <td align="left">CueClusterPosition</td>
<td align="left">Described in <xref target="cueclusterposition-element"></xref>< /td> <td align="left">RFC 9559, <xref target="cueclusterposition-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0xF7</td> <td align="right">0xF7</td>
<td align="left">CueTrack</td> <td align="left">CueTrack</td>
<td align="left">Described in <xref target="cuetrack-element"></xref></td> <td align="left">RFC 9559, <xref target="cuetrack-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xFA</td> <td align="right">0xFA</td>
<td align="left">ReferencePriority</td> <td align="left">ReferencePriority</td>
<td align="left">Described in <xref target="referencepriority-element"></xref></ td> <td align="left">RFC 9559, <xref target="referencepriority-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xFB</td> <td align="right">0xFB</td>
<td align="left">ReferenceBlock</td> <td align="left">ReferenceBlock</td>
<td align="left">Described in <xref target="referenceblock-element"></xref></td> <td align="left">RFC 9559, <xref target="referenceblock-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xFD</td> <td align="right">0xFD</td>
<td align="left">ReferenceVirtual</td> <td align="left">ReferenceVirtual</td>
<td align="left">Reclaimed (<xref target="referencevirtual-element"></xref>)</td > <td align="left">Reclaimed (RFC 9559, <xref target="referencevirtual-element"></ xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x41A4</td> <td align="right">0x41A4</td>
<td align="left">BlockAddIDName</td> <td align="left">BlockAddIDName</td>
<td align="left">Described in <xref target="blockaddidname-element"></xref></td> <td align="left">RFC 9559, <xref target="blockaddidname-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x41E4</td> <td align="right">0x41E4</td>
<td align="left">BlockAdditionMapping</td> <td align="left">BlockAdditionMapping</td>
<td align="left">Described in <xref target="blockadditionmapping-element"></xref ></td> <td align="left">RFC 9559, <xref target="blockadditionmapping-element"></xref></ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x41E7</td> <td align="right">0x41E7</td>
<td align="left">BlockAddIDType</td> <td align="left">BlockAddIDType</td>
<td align="left">Described in <xref target="blockaddidtype-element"></xref></td> <td align="left">RFC 9559, <xref target="blockaddidtype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x41ED</td> <td align="right">0x41ED</td>
<td align="left">BlockAddIDExtraData</td> <td align="left">BlockAddIDExtraData</td>
<td align="left">Described in <xref target="blockaddidextradata-element"></xref> </td> <td align="left">RFC 9559, <xref target="blockaddidextradata-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x41F0</td> <td align="right">0x41F0</td>
<td align="left">BlockAddIDValue</td> <td align="left">BlockAddIDValue</td>
<td align="left">Described in <xref target="blockaddidvalue-element"></xref></td > <td align="left">RFC 9559, <xref target="blockaddidvalue-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4254</td> <td align="right">0x4254</td>
<td align="left">ContentCompAlgo</td> <td align="left">ContentCompAlgo</td>
<td align="left">Described in <xref target="contentcompalgo-element"></xref></td > <td align="left">RFC 9559, <xref target="contentcompalgo-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4255</td> <td align="right">0x4255</td>
<td align="left">ContentCompSettings</td> <td align="left">ContentCompSettings</td>
<td align="left">Described in <xref target="contentcompsettings-element"></xref> </td> <td align="left">RFC 9559, <xref target="contentcompsettings-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x437C</td> <td align="right">0x437C</td>
<td align="left">ChapLanguage</td> <td align="left">ChapLanguage</td>
<td align="left">Described in <xref target="chaplanguage-element"></xref></td> <td align="left">RFC 9559, <xref target="chaplanguage-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x437D</td> <td align="right">0x437D</td>
<td align="left">ChapLanguageBCP47</td> <td align="left">ChapLanguageBCP47</td>
<td align="left">Described in <xref target="chaplanguagebcp47-element"></xref></ td> <td align="left">RFC 9559, <xref target="chaplanguagebcp47-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x437E</td> <td align="right">0x437E</td>
<td align="left">ChapCountry</td> <td align="left">ChapCountry</td>
<td align="left">Described in <xref target="chapcountry-element"></xref></td> <td align="left">RFC 9559, <xref target="chapcountry-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4444</td> <td align="right">0x4444</td>
<td align="left">SegmentFamily</td> <td align="left">SegmentFamily</td>
<td align="left">Described in <xref target="segmentfamily-element"></xref></td> <td align="left">RFC 9559, <xref target="segmentfamily-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4461</td> <td align="right">0x4461</td>
<td align="left">DateUTC</td> <td align="left">DateUTC</td>
<td align="left">Described in <xref target="dateutc-element"></xref></td> <td align="left">RFC 9559, <xref target="dateutc-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x447A</td> <td align="right">0x447A</td>
<td align="left">TagLanguage</td> <td align="left">TagLanguage</td>
<td align="left">Described in <xref target="taglanguage-element"></xref></td> <td align="left">RFC 9559, <xref target="taglanguage-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x447B</td> <td align="right">0x447B</td>
<td align="left">TagLanguageBCP47</td> <td align="left">TagLanguageBCP47</td>
<td align="left">Described in <xref target="taglanguagebcp47-element"></xref></t d> <td align="left">RFC 9559, <xref target="taglanguagebcp47-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4484</td> <td align="right">0x4484</td>
<td align="left">TagDefault</td> <td align="left">TagDefault</td>
<td align="left">Described in <xref target="tagdefault-element"></xref></td> <td align="left">RFC 9559, <xref target="tagdefault-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4485</td> <td align="right">0x4485</td>
<td align="left">TagBinary</td> <td align="left">TagBinary</td>
<td align="left">Described in <xref target="tagbinary-element"></xref></td> <td align="left">RFC 9559, <xref target="tagbinary-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4487</td> <td align="right">0x4487</td>
<td align="left">TagString</td> <td align="left">TagString</td>
<td align="left">Described in <xref target="tagstring-element"></xref></td> <td align="left">RFC 9559, <xref target="tagstring-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4489</td> <td align="right">0x4489</td>
<td align="left">Duration</td> <td align="left">Duration</td>
<td align="left">Described in <xref target="duration-element"></xref></td> <td align="left">RFC 9559, <xref target="duration-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x44B4</td> <td align="right">0x44B4</td>
<td align="left">TagDefaultBogus</td> <td align="left">TagDefaultBogus</td>
<td align="left">Reclaimed (<xref target="tagdefaultbogus-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="tagdefaultbogus-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x450D</td> <td align="right">0x450D</td>
<td align="left">ChapProcessPrivate</td> <td align="left">ChapProcessPrivate</td>
<td align="left">Described in <xref target="chapprocessprivate-element"></xref>< /td> <td align="left">RFC 9559, <xref target="chapprocessprivate-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x45A3</td> <td align="right">0x45A3</td>
<td align="left">TagName</td> <td align="left">TagName</td>
<td align="left">Described in <xref target="tagname-element"></xref></td> <td align="left">RFC 9559, <xref target="tagname-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x45B9</td> <td align="right">0x45B9</td>
<td align="left">EditionEntry</td> <td align="left">EditionEntry</td>
<td align="left">Described in <xref target="editionentry-element"></xref></td> <td align="left">RFC 9559, <xref target="editionentry-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x45BC</td> <td align="right">0x45BC</td>
<td align="left">EditionUID</td> <td align="left">EditionUID</td>
<td align="left">Described in <xref target="editionuid-element"></xref></td> <td align="left">RFC 9559, <xref target="editionuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x45DB</td> <td align="right">0x45DB</td>
<td align="left">EditionFlagDefault</td> <td align="left">EditionFlagDefault</td>
<td align="left">Described in <xref target="editionflagdefault-element"></xref>< /td> <td align="left">RFC 9559, <xref target="editionflagdefault-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x45DD</td> <td align="right">0x45DD</td>
<td align="left">EditionFlagOrdered</td> <td align="left">EditionFlagOrdered</td>
<td align="left">Described in <xref target="editionflagordered-element"></xref>< /td> <td align="left">RFC 9559, <xref target="editionflagordered-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x465C</td> <td align="right">0x465C</td>
<td align="left">FileData</td> <td align="left">FileData</td>
<td align="left">Described in <xref target="filedata-element"></xref></td> <td align="left">RFC 9559, <xref target="filedata-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4660</td> <td align="right">0x4660</td>
<td align="left">FileMediaType</td> <td align="left">FileMediaType</td>
<td align="left">Described in <xref target="filemediatype-element"></xref></td> <td align="left">RFC 9559, <xref target="filemediatype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4661</td> <td align="right">0x4661</td>
<td align="left">FileUsedStartTime</td> <td align="left">FileUsedStartTime</td>
<td align="left">Reclaimed (<xref target="fileusedstarttime-element"></xref>)</t d> <td align="left">Reclaimed (RFC 9559, <xref target="fileusedstarttime-element">< /xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4662</td> <td align="right">0x4662</td>
<td align="left">FileUsedEndTime</td> <td align="left">FileUsedEndTime</td>
<td align="left">Reclaimed (<xref target="fileusedendtime-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="fileusedendtime-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x466E</td> <td align="right">0x466E</td>
<td align="left">FileName</td> <td align="left">FileName</td>
<td align="left">Described in <xref target="filename-element"></xref></td> <td align="left">RFC 9559, <xref target="filename-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4675</td> <td align="right">0x4675</td>
<td align="left">FileReferral</td> <td align="left">FileReferral</td>
<td align="left">Reclaimed (<xref target="filereferral-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="filereferral-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x467E</td> <td align="right">0x467E</td>
<td align="left">FileDescription</td> <td align="left">FileDescription</td>
<td align="left">Described in <xref target="filedescription-element"></xref></td > <td align="left">RFC 9559, <xref target="filedescription-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x46AE</td> <td align="right">0x46AE</td>
<td align="left">FileUID</td> <td align="left">FileUID</td>
<td align="left">Described in <xref target="fileuid-element"></xref></td> <td align="left">RFC 9559, <xref target="fileuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E1</td> <td align="right">0x47E1</td>
<td align="left">ContentEncAlgo</td> <td align="left">ContentEncAlgo</td>
<td align="left">Described in <xref target="contentencalgo-element"></xref></td> <td align="left">RFC 9559, <xref target="contentencalgo-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E2</td> <td align="right">0x47E2</td>
<td align="left">ContentEncKeyID</td> <td align="left">ContentEncKeyID</td>
<td align="left">Described in <xref target="contentenckeyid-element"></xref></td > <td align="left">RFC 9559, <xref target="contentenckeyid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E3</td> <td align="right">0x47E3</td>
<td align="left">ContentSignature</td> <td align="left">ContentSignature</td>
<td align="left">Reclaimed (<xref target="contentsignature-element"></xref>)</td > <td align="left">Reclaimed (RFC 9559, <xref target="contentsignature-element"></ xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E4</td> <td align="right">0x47E4</td>
<td align="left">ContentSigKeyID</td> <td align="left">ContentSigKeyID</td>
<td align="left">Reclaimed (<xref target="contentsigkeyid-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="contentsigkeyid-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E5</td> <td align="right">0x47E5</td>
<td align="left">ContentSigAlgo</td> <td align="left">ContentSigAlgo</td>
<td align="left">Reclaimed (<xref target="contentsigalgo-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="contentsigalgo-element"></xr ef>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E6</td> <td align="right">0x47E6</td>
<td align="left">ContentSigHashAlgo</td> <td align="left">ContentSigHashAlgo</td>
<td align="left">Reclaimed (<xref target="contentsighashalgo-element"></xref>)</ td> <td align="left">Reclaimed (RFC 9559, <xref target="contentsighashalgo-element"> </xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E7</td> <td align="right">0x47E7</td>
<td align="left">ContentEncAESSettings</td> <td align="left">ContentEncAESSettings</td>
<td align="left">Described in <xref target="contentencaessettings-element"></xre f></td> <td align="left">RFC 9559, <xref target="contentencaessettings-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E8</td> <td align="right">0x47E8</td>
<td align="left">AESSettingsCipherMode</td> <td align="left">AESSettingsCipherMode</td>
<td align="left">Described in <xref target="aessettingsciphermode-element"></xre f></td> <td align="left">RFC 9559, <xref target="aessettingsciphermode-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4D80</td> <td align="right">0x4D80</td>
<td align="left">MuxingApp</td> <td align="left">MuxingApp</td>
<td align="left">Described in <xref target="muxingapp-element"></xref></td> <td align="left">RFC 9559, <xref target="muxingapp-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4DBB</td> <td align="right">0x4DBB</td>
<td align="left">Seek</td> <td align="left">Seek</td>
<td align="left">Described in <xref target="seek-element"></xref></td> <td align="left">RFC 9559, <xref target="seek-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5031</td> <td align="right">0x5031</td>
<td align="left">ContentEncodingOrder</td> <td align="left">ContentEncodingOrder</td>
<td align="left">Described in <xref target="contentencodingorder-element"></xref ></td> <td align="left">RFC 9559, <xref target="contentencodingorder-element"></xref></ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5032</td> <td align="right">0x5032</td>
<td align="left">ContentEncodingScope</td> <td align="left">ContentEncodingScope</td>
<td align="left">Described in <xref target="contentencodingscope-element"></xref ></td> <td align="left">RFC 9559, <xref target="contentencodingscope-element"></xref></ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5033</td> <td align="right">0x5033</td>
<td align="left">ContentEncodingType</td> <td align="left">ContentEncodingType</td>
<td align="left">Described in <xref target="contentencodingtype-element"></xref> </td> <td align="left">RFC 9559, <xref target="contentencodingtype-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x5034</td> <td align="right">0x5034</td>
<td align="left">ContentCompression</td> <td align="left">ContentCompression</td>
<td align="left">Described in <xref target="contentcompression-element"></xref>< /td> <td align="left">RFC 9559, <xref target="contentcompression-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x5035</td> <td align="right">0x5035</td>
<td align="left">ContentEncryption</td> <td align="left">ContentEncryption</td>
<td align="left">Described in <xref target="contentencryption-element"></xref></ td> <td align="left">RFC 9559, <xref target="contentencryption-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x535F</td> <td align="right">0x535F</td>
<td align="left">CueRefNumber</td> <td align="left">CueRefNumber</td>
<td align="left">Reclaimed (<xref target="cuerefnumber-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="cuerefnumber-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x536E</td> <td align="right">0x536E</td>
<td align="left">Name</td> <td align="left">Name</td>
<td align="left">Described in <xref target="name-element"></xref></td> <td align="left">RFC 9559, <xref target="name-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5378</td> <td align="right">0x5378</td>
<td align="left">CueBlockNumber</td> <td align="left">CueBlockNumber</td>
<td align="left">Described in <xref target="cueblocknumber-element"></xref></td> <td align="left">RFC 9559, <xref target="cueblocknumber-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x537F</td> <td align="right">0x537F</td>
<td align="left">TrackOffset</td> <td align="left">TrackOffset</td>
<td align="left">Reclaimed (<xref target="trackoffset-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="trackoffset-element"></xref> )</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x53AB</td> <td align="right">0x53AB</td>
<td align="left">SeekID</td> <td align="left">SeekID</td>
<td align="left">Described in <xref target="seekid-element"></xref></td> <td align="left">RFC 9559, <xref target="seekid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x53AC</td> <td align="right">0x53AC</td>
<td align="left">SeekPosition</td> <td align="left">SeekPosition</td>
<td align="left">Described in <xref target="seekposition-element"></xref></td> <td align="left">RFC 9559, <xref target="seekposition-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x53B8</td> <td align="right">0x53B8</td>
<td align="left">StereoMode</td> <td align="left">StereoMode</td>
<td align="left">Described in <xref target="stereomode-element"></xref></td> <td align="left">RFC 9559, <xref target="stereomode-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x53B9</td> <td align="right">0x53B9</td>
<td align="left">OldStereoMode</td> <td align="left">OldStereoMode</td>
<td align="left">Described in <xref target="oldstereomode-element"></xref></td> <td align="left">RFC 9559, <xref target="oldstereomode-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x53C0</td> <td align="right">0x53C0</td>
<td align="left">AlphaMode</td> <td align="left">AlphaMode</td>
<td align="left">Described in <xref target="alphamode-element"></xref></td> <td align="left">RFC 9559, <xref target="alphamode-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54AA</td> <td align="right">0x54AA</td>
<td align="left">PixelCropBottom</td> <td align="left">PixelCropBottom</td>
<td align="left">Described in <xref target="pixelcropbottom-element"></xref></td > <td align="left">RFC 9559, <xref target="pixelcropbottom-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54B0</td> <td align="right">0x54B0</td>
<td align="left">DisplayWidth</td> <td align="left">DisplayWidth</td>
<td align="left">Described in <xref target="displaywidth-element"></xref></td> <td align="left">RFC 9559, <xref target="displaywidth-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54B2</td> <td align="right">0x54B2</td>
<td align="left">DisplayUnit</td> <td align="left">DisplayUnit</td>
<td align="left">Described in <xref target="displayunit-element"></xref></td> <td align="left">RFC 9559, <xref target="displayunit-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54B3</td> <td align="right">0x54B3</td>
<td align="left">AspectRatioType</td> <td align="left">AspectRatioType</td>
<td align="left">Reclaimed (<xref target="aspectratiotype-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="aspectratiotype-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54BA</td> <td align="right">0x54BA</td>
<td align="left">DisplayHeight</td> <td align="left">DisplayHeight</td>
<td align="left">Described in <xref target="displayheight-element"></xref></td> <td align="left">RFC 9559, <xref target="displayheight-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54BB</td> <td align="right">0x54BB</td>
<td align="left">PixelCropTop</td> <td align="left">PixelCropTop</td>
<td align="left">Described in <xref target="pixelcroptop-element"></xref></td> <td align="left">RFC 9559, <xref target="pixelcroptop-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54CC</td> <td align="right">0x54CC</td>
<td align="left">PixelCropLeft</td> <td align="left">PixelCropLeft</td>
<td align="left">Described in <xref target="pixelcropleft-element"></xref></td> <td align="left">RFC 9559, <xref target="pixelcropleft-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54DD</td> <td align="right">0x54DD</td>
<td align="left">PixelCropRight</td> <td align="left">PixelCropRight</td>
<td align="left">Described in <xref target="pixelcropright-element"></xref></td> <td align="left">RFC 9559, <xref target="pixelcropright-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55AA</td> <td align="right">0x55AA</td>
<td align="left">FlagForced</td> <td align="left">FlagForced</td>
<td align="left">Described in <xref target="flagforced-element"></xref></td> <td align="left">RFC 9559, <xref target="flagforced-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55AB</td> <td align="right">0x55AB</td>
<td align="left">FlagHearingImpaired</td> <td align="left">FlagHearingImpaired</td>
<td align="left">Described in <xref target="flaghearingimpaired-element"></xref> </td> <td align="left">RFC 9559, <xref target="flaghearingimpaired-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x55AC</td> <td align="right">0x55AC</td>
<td align="left">FlagVisualImpaired</td> <td align="left">FlagVisualImpaired</td>
<td align="left">Described in <xref target="flagvisualimpaired-element"></xref>< /td> <td align="left">RFC 9559, <xref target="flagvisualimpaired-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x55AD</td> <td align="right">0x55AD</td>
<td align="left">FlagTextDescriptions</td> <td align="left">FlagTextDescriptions</td>
<td align="left">Described in <xref target="flagtextdescriptions-element"></xref ></td> <td align="left">RFC 9559, <xref target="flagtextdescriptions-element"></xref></ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55AE</td> <td align="right">0x55AE</td>
<td align="left">FlagOriginal</td> <td align="left">FlagOriginal</td>
<td align="left">Described in <xref target="flagoriginal-element"></xref></td> <td align="left">RFC 9559, <xref target="flagoriginal-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55AF</td> <td align="right">0x55AF</td>
<td align="left">FlagCommentary</td> <td align="left">FlagCommentary</td>
<td align="left">Described in <xref target="flagcommentary-element"></xref></td> <td align="left">RFC 9559, <xref target="flagcommentary-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B0</td> <td align="right">0x55B0</td>
<td align="left">Colour</td> <td align="left">Colour</td>
<td align="left">Described in <xref target="colour-element"></xref></td> <td align="left">RFC 9559, <xref target="colour-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B1</td> <td align="right">0x55B1</td>
<td align="left">MatrixCoefficients</td> <td align="left">MatrixCoefficients</td>
<td align="left">Described in <xref target="matrixcoefficients-element"></xref>< /td> <td align="left">RFC 9559, <xref target="matrixcoefficients-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x55B2</td> <td align="right">0x55B2</td>
<td align="left">BitsPerChannel</td> <td align="left">BitsPerChannel</td>
<td align="left">Described in <xref target="bitsperchannel-element"></xref></td> <td align="left">RFC 9559, <xref target="bitsperchannel-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B3</td> <td align="right">0x55B3</td>
<td align="left">ChromaSubsamplingHorz</td> <td align="left">ChromaSubsamplingHorz</td>
<td align="left">Described in <xref target="chromasubsamplinghorz-element"></xre f></td> <td align="left">RFC 9559, <xref target="chromasubsamplinghorz-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B4</td> <td align="right">0x55B4</td>
<td align="left">ChromaSubsamplingVert</td> <td align="left">ChromaSubsamplingVert</td>
<td align="left">Described in <xref target="chromasubsamplingvert-element"></xre f></td> <td align="left">RFC 9559, <xref target="chromasubsamplingvert-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B5</td> <td align="right">0x55B5</td>
<td align="left">CbSubsamplingHorz</td> <td align="left">CbSubsamplingHorz</td>
<td align="left">Described in <xref target="cbsubsamplinghorz-element"></xref></ td> <td align="left">RFC 9559, <xref target="cbsubsamplinghorz-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B6</td> <td align="right">0x55B6</td>
<td align="left">CbSubsamplingVert</td> <td align="left">CbSubsamplingVert</td>
<td align="left">Described in <xref target="cbsubsamplingvert-element"></xref></ td> <td align="left">RFC 9559, <xref target="cbsubsamplingvert-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B7</td> <td align="right">0x55B7</td>
<td align="left">ChromaSitingHorz</td> <td align="left">ChromaSitingHorz</td>
<td align="left">Described in <xref target="chromasitinghorz-element"></xref></t d> <td align="left">RFC 9559, <xref target="chromasitinghorz-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B8</td> <td align="right">0x55B8</td>
<td align="left">ChromaSitingVert</td> <td align="left">ChromaSitingVert</td>
<td align="left">Described in <xref target="chromasitingvert-element"></xref></t d> <td align="left">RFC 9559, <xref target="chromasitingvert-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B9</td> <td align="right">0x55B9</td>
<td align="left">Range</td> <td align="left">Range</td>
<td align="left">Described in <xref target="range-element"></xref></td> <td align="left">RFC 9559, <xref target="range-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55BA</td> <td align="right">0x55BA</td>
<td align="left">TransferCharacteristics</td> <td align="left">TransferCharacteristics</td>
<td align="left">Described in <xref target="transfercharacteristics-element"></x ref></td> <td align="left">RFC 9559, <xref target="transfercharacteristics-element"></xref ></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55BB</td> <td align="right">0x55BB</td>
<td align="left">Primaries</td> <td align="left">Primaries</td>
<td align="left">Described in <xref target="primaries-element"></xref></td> <td align="left">RFC 9559, <xref target="primaries-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55BC</td> <td align="right">0x55BC</td>
<td align="left">MaxCLL</td> <td align="left">MaxCLL</td>
<td align="left">Described in <xref target="maxcll-element"></xref></td> <td align="left">RFC 9559, <xref target="maxcll-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55BD</td> <td align="right">0x55BD</td>
<td align="left">MaxFALL</td> <td align="left">MaxFALL</td>
<td align="left">Described in <xref target="maxfall-element"></xref></td> <td align="left">RFC 9559, <xref target="maxfall-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D0</td> <td align="right">0x55D0</td>
<td align="left">MasteringMetadata</td> <td align="left">MasteringMetadata</td>
<td align="left">Described in <xref target="masteringmetadata-element"></xref></ td> <td align="left">RFC 9559, <xref target="masteringmetadata-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D1</td> <td align="right">0x55D1</td>
<td align="left">PrimaryRChromaticityX</td> <td align="left">PrimaryRChromaticityX</td>
<td align="left">Described in <xref target="primaryrchromaticityx-element"></xre f></td> <td align="left">RFC 9559, <xref target="primaryrchromaticityx-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D2</td> <td align="right">0x55D2</td>
<td align="left">PrimaryRChromaticityY</td> <td align="left">PrimaryRChromaticityY</td>
<td align="left">Described in <xref target="primaryrchromaticityy-element"></xre f></td> <td align="left">RFC 9559, <xref target="primaryrchromaticityy-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D3</td> <td align="right">0x55D3</td>
<td align="left">PrimaryGChromaticityX</td> <td align="left">PrimaryGChromaticityX</td>
<td align="left">Described in <xref target="primarygchromaticityx-element"></xre f></td> <td align="left">RFC 9559, <xref target="primarygchromaticityx-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D4</td> <td align="right">0x55D4</td>
<td align="left">PrimaryGChromaticityY</td> <td align="left">PrimaryGChromaticityY</td>
<td align="left">Described in <xref target="primarygchromaticityy-element"></xre f></td> <td align="left">RFC 9559, <xref target="primarygchromaticityy-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D5</td> <td align="right">0x55D5</td>
<td align="left">PrimaryBChromaticityX</td> <td align="left">PrimaryBChromaticityX</td>
<td align="left">Described in <xref target="primarybchromaticityx-element"></xre f></td> <td align="left">RFC 9559, <xref target="primarybchromaticityx-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D6</td> <td align="right">0x55D6</td>
<td align="left">PrimaryBChromaticityY</td> <td align="left">PrimaryBChromaticityY</td>
<td align="left">Described in <xref target="primarybchromaticityy-element"></xre f></td> <td align="left">RFC 9559, <xref target="primarybchromaticityy-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D7</td> <td align="right">0x55D7</td>
<td align="left">WhitePointChromaticityX</td> <td align="left">WhitePointChromaticityX</td>
<td align="left">Described in <xref target="whitepointchromaticityx-element"></x ref></td> <td align="left">RFC 9559, <xref target="whitepointchromaticityx-element"></xref ></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D8</td> <td align="right">0x55D8</td>
<td align="left">WhitePointChromaticityY</td> <td align="left">WhitePointChromaticityY</td>
<td align="left">Described in <xref target="whitepointchromaticityy-element"></x ref></td> <td align="left">RFC 9559, <xref target="whitepointchromaticityy-element"></xref ></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D9</td> <td align="right">0x55D9</td>
<td align="left">LuminanceMax</td> <td align="left">LuminanceMax</td>
<td align="left">Described in <xref target="luminancemax-element"></xref></td> <td align="left">RFC 9559, <xref target="luminancemax-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55DA</td> <td align="right">0x55DA</td>
<td align="left">LuminanceMin</td> <td align="left">LuminanceMin</td>
<td align="left">Described in <xref target="luminancemin-element"></xref></td> <td align="left">RFC 9559, <xref target="luminancemin-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55EE</td> <td align="right">0x55EE</td>
<td align="left">MaxBlockAdditionID</td> <td align="left">MaxBlockAdditionID</td>
<td align="left">Described in <xref target="maxblockadditionid-element"></xref>< /td> <td align="left">RFC 9559, <xref target="maxblockadditionid-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x5654</td> <td align="right">0x5654</td>
<td align="left">ChapterStringUID</td> <td align="left">ChapterStringUID</td>
<td align="left">Described in <xref target="chapterstringuid-element"></xref></t d> <td align="left">RFC 9559, <xref target="chapterstringuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x56AA</td> <td align="right">0x56AA</td>
<td align="left">CodecDelay</td> <td align="left">CodecDelay</td>
<td align="left">Described in <xref target="codecdelay-element"></xref></td> <td align="left">RFC 9559, <xref target="codecdelay-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x56BB</td> <td align="right">0x56BB</td>
<td align="left">SeekPreRoll</td> <td align="left">SeekPreRoll</td>
<td align="left">Described in <xref target="seekpreroll-element"></xref></td> <td align="left">RFC 9559, <xref target="seekpreroll-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5741</td> <td align="right">0x5741</td>
<td align="left">WritingApp</td> <td align="left">WritingApp</td>
<td align="left">Described in <xref target="writingapp-element"></xref></td> <td align="left">RFC 9559, <xref target="writingapp-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5854</td> <td align="right">0x5854</td>
<td align="left">SilentTracks</td> <td align="left">SilentTracks</td>
<td align="left">Reclaimed (<xref target="silenttracks-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="silenttracks-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x58D7</td> <td align="right">0x58D7</td>
<td align="left">SilentTrackNumber</td> <td align="left">SilentTrackNumber</td>
<td align="left">Reclaimed (<xref target="silenttracknumber-element"></xref>)</t d> <td align="left">Reclaimed (RFC 9559, <xref target="silenttracknumber-element">< /xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x61A7</td> <td align="right">0x61A7</td>
<td align="left">AttachedFile</td> <td align="left">AttachedFile</td>
<td align="left">Described in <xref target="attachedfile-element"></xref></td> <td align="left">RFC 9559, <xref target="attachedfile-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6240</td> <td align="right">0x6240</td>
<td align="left">ContentEncoding</td> <td align="left">ContentEncoding</td>
<td align="left">Described in <xref target="contentencoding-element"></xref></td > <td align="left">RFC 9559, <xref target="contentencoding-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6264</td> <td align="right">0x6264</td>
<td align="left">BitDepth</td> <td align="left">BitDepth</td>
<td align="left">Described in <xref target="bitdepth-element"></xref></td> <td align="left">RFC 9559, <xref target="bitdepth-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63A2</td> <td align="right">0x63A2</td>
<td align="left">CodecPrivate</td> <td align="left">CodecPrivate</td>
<td align="left">Described in <xref target="codecprivate-element"></xref></td> <td align="left">RFC 9559, <xref target="codecprivate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C0</td> <td align="right">0x63C0</td>
<td align="left">Targets</td> <td align="left">Targets</td>
<td align="left">Described in <xref target="targets-element"></xref></td> <td align="left">RFC 9559, <xref target="targets-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C3</td> <td align="right">0x63C3</td>
<td align="left">ChapterPhysicalEquiv</td> <td align="left">ChapterPhysicalEquiv</td>
<td align="left">Described in <xref target="chapterphysicalequiv-element"></xref ></td> <td align="left">RFC 9559, <xref target="chapterphysicalequiv-element"></xref></ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C4</td> <td align="right">0x63C4</td>
<td align="left">TagChapterUID</td> <td align="left">TagChapterUID</td>
<td align="left">Described in <xref target="tagchapteruid-element"></xref></td> <td align="left">RFC 9559, <xref target="tagchapteruid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C5</td> <td align="right">0x63C5</td>
<td align="left">TagTrackUID</td> <td align="left">TagTrackUID</td>
<td align="left">Described in <xref target="tagtrackuid-element"></xref></td> <td align="left">RFC 9559, <xref target="tagtrackuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C6</td> <td align="right">0x63C6</td>
<td align="left">TagAttachmentUID</td> <td align="left">TagAttachmentUID</td>
<td align="left">Described in <xref target="tagattachmentuid-element"></xref></t d> <td align="left">RFC 9559, <xref target="tagattachmentuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C9</td> <td align="right">0x63C9</td>
<td align="left">TagEditionUID</td> <td align="left">TagEditionUID</td>
<td align="left">Described in <xref target="tageditionuid-element"></xref></td> <td align="left">RFC 9559, <xref target="tageditionuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63CA</td> <td align="right">0x63CA</td>
<td align="left">TargetType</td> <td align="left">TargetType</td>
<td align="left">Described in <xref target="targettype-element"></xref></td> <td align="left">RFC 9559, <xref target="targettype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6624</td> <td align="right">0x6624</td>
<td align="left">TrackTranslate</td> <td align="left">TrackTranslate</td>
<td align="left">Described in <xref target="tracktranslate-element"></xref></td> <td align="left">RFC 9559, <xref target="tracktranslate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x66A5</td> <td align="right">0x66A5</td>
<td align="left">TrackTranslateTrackID</td> <td align="left">TrackTranslateTrackID</td>
<td align="left">Described in <xref target="tracktranslatetrackid-element"></xre f></td> <td align="left">RFC 9559, <xref target="tracktranslatetrackid-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x66BF</td> <td align="right">0x66BF</td>
<td align="left">TrackTranslateCodec</td> <td align="left">TrackTranslateCodec</td>
<td align="left">Described in <xref target="tracktranslatecodec-element"></xref> </td> <td align="left">RFC 9559, <xref target="tracktranslatecodec-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x66FC</td> <td align="right">0x66FC</td>
<td align="left">TrackTranslateEditionUID</td> <td align="left">TrackTranslateEditionUID</td>
<td align="left">Described in <xref target="tracktranslateeditionuid-element"></ xref></td> <td align="left">RFC 9559, <xref target="tracktranslateeditionuid-element"></xre f></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x67C8</td> <td align="right">0x67C8</td>
<td align="left">SimpleTag</td> <td align="left">SimpleTag</td>
<td align="left">Described in <xref target="simpletag-element"></xref></td> <td align="left">RFC 9559, <xref target="simpletag-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x68CA</td> <td align="right">0x68CA</td>
<td align="left">TargetTypeValue</td> <td align="left">TargetTypeValue</td>
<td align="left">Described in <xref target="targettypevalue-element"></xref></td > <td align="left">RFC 9559, <xref target="targettypevalue-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6911</td> <td align="right">0x6911</td>
<td align="left">ChapProcessCommand</td> <td align="left">ChapProcessCommand</td>
<td align="left">Described in <xref target="chapprocesscommand-element"></xref>< /td> <td align="left">RFC 9559, <xref target="chapprocesscommand-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x6922</td> <td align="right">0x6922</td>
<td align="left">ChapProcessTime</td> <td align="left">ChapProcessTime</td>
<td align="left">Described in <xref target="chapprocesstime-element"></xref></td > <td align="left">RFC 9559, <xref target="chapprocesstime-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6924</td> <td align="right">0x6924</td>
<td align="left">ChapterTranslate</td> <td align="left">ChapterTranslate</td>
<td align="left">Described in <xref target="chaptertranslate-element"></xref></t d> <td align="left">RFC 9559, <xref target="chaptertranslate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6933</td> <td align="right">0x6933</td>
<td align="left">ChapProcessData</td> <td align="left">ChapProcessData</td>
<td align="left">Described in <xref target="chapprocessdata-element"></xref></td > <td align="left">RFC 9559, <xref target="chapprocessdata-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6944</td> <td align="right">0x6944</td>
<td align="left">ChapProcess</td> <td align="left">ChapProcess</td>
<td align="left">Described in <xref target="chapprocess-element"></xref></td> <td align="left">RFC 9559, <xref target="chapprocess-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6955</td> <td align="right">0x6955</td>
<td align="left">ChapProcessCodecID</td> <td align="left">ChapProcessCodecID</td>
<td align="left">Described in <xref target="chapprocesscodecid-element"></xref>< /td> <td align="left">RFC 9559, <xref target="chapprocesscodecid-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x69A5</td> <td align="right">0x69A5</td>
<td align="left">ChapterTranslateID</td> <td align="left">ChapterTranslateID</td>
<td align="left">Described in <xref target="chaptertranslateid-element"></xref>< /td> <td align="left">RFC 9559, <xref target="chaptertranslateid-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x69BF</td> <td align="right">0x69BF</td>
<td align="left">ChapterTranslateCodec</td> <td align="left">ChapterTranslateCodec</td>
<td align="left">Described in <xref target="chaptertranslatecodec-element"></xre f></td> <td align="left">RFC 9559, <xref target="chaptertranslatecodec-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x69FC</td> <td align="right">0x69FC</td>
<td align="left">ChapterTranslateEditionUID</td> <td align="left">ChapterTranslateEditionUID</td>
<td align="left">Described in <xref target="chaptertranslateeditionuid-element"> </xref></td> <td align="left">RFC 9559, <xref target="chaptertranslateeditionuid-element"></x ref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6D80</td> <td align="right">0x6D80</td>
<td align="left">ContentEncodings</td> <td align="left">ContentEncodings</td>
<td align="left">Described in <xref target="contentencodings-element"></xref></t d> <td align="left">RFC 9559, <xref target="contentencodings-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6DE7</td> <td align="right">0x6DE7</td>
<td align="left">MinCache</td> <td align="left">MinCache</td>
<td align="left">Reclaimed (<xref target="mincache-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="mincache-element"></xref>)</ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6DF8</td> <td align="right">0x6DF8</td>
<td align="left">MaxCache</td> <td align="left">MaxCache</td>
<td align="left">Reclaimed (<xref target="maxcache-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="maxcache-element"></xref>)</ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6E67</td> <td align="right">0x6E67</td>
<td align="left">ChapterSegmentUUID</td> <td align="left">ChapterSegmentUUID</td>
<td align="left">Described in <xref target="chaptersegmentuuid-element"></xref>< /td> <td align="left">RFC 9559, <xref target="chaptersegmentuuid-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x6EBC</td> <td align="right">0x6EBC</td>
<td align="left">ChapterSegmentEditionUID</td> <td align="left">ChapterSegmentEditionUID</td>
<td align="left">Described in <xref target="chaptersegmenteditionuid-element"></ xref></td> <td align="left">RFC 9559, <xref target="chaptersegmenteditionuid-element"></xre f></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6FAB</td> <td align="right">0x6FAB</td>
<td align="left">TrackOverlay</td> <td align="left">TrackOverlay</td>
<td align="left">Reclaimed (<xref target="trackoverlay-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="trackoverlay-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7373</td> <td align="right">0x7373</td>
<td align="left">Tag</td> <td align="left">Tag</td>
<td align="left">Described in <xref target="tag-element"></xref></td> <td align="left">RFC 9559, <xref target="tag-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7384</td> <td align="right">0x7384</td>
<td align="left">SegmentFilename</td> <td align="left">SegmentFilename</td>
<td align="left">Described in <xref target="segmentfilename-element"></xref></td > <td align="left">RFC 9559, <xref target="segmentfilename-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x73A4</td> <td align="right">0x73A4</td>
<td align="left">SegmentUUID</td> <td align="left">SegmentUUID</td>
<td align="left">Described in <xref target="segmentuuid-element"></xref></td> <td align="left">RFC 9559, <xref target="segmentuuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x73C4</td> <td align="right">0x73C4</td>
<td align="left">ChapterUID</td> <td align="left">ChapterUID</td>
<td align="left">Described in <xref target="chapteruid-element"></xref></td> <td align="left">RFC 9559, <xref target="chapteruid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x73C5</td> <td align="right">0x73C5</td>
<td align="left">TrackUID</td> <td align="left">TrackUID</td>
<td align="left">Described in <xref target="trackuid-element"></xref></td> <td align="left">RFC 9559, <xref target="trackuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7446</td> <td align="right">0x7446</td>
<td align="left">AttachmentLink</td> <td align="left">AttachmentLink</td>
<td align="left">Described in <xref target="attachmentlink-element"></xref></td> <td align="left">RFC 9559, <xref target="attachmentlink-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x75A1</td> <td align="right">0x75A1</td>
<td align="left">BlockAdditions</td> <td align="left">BlockAdditions</td>
<td align="left">Described in <xref target="blockadditions-element"></xref></td> <td align="left">RFC 9559, <xref target="blockadditions-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x75A2</td> <td align="right">0x75A2</td>
<td align="left">DiscardPadding</td> <td align="left">DiscardPadding</td>
<td align="left">Described in <xref target="discardpadding-element"></xref></td> <td align="left">RFC 9559, <xref target="discardpadding-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7670</td> <td align="right">0x7670</td>
<td align="left">Projection</td> <td align="left">Projection</td>
<td align="left">Described in <xref target="projection-element"></xref></td> <td align="left">RFC 9559, <xref target="projection-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7671</td> <td align="right">0x7671</td>
<td align="left">ProjectionType</td> <td align="left">ProjectionType</td>
<td align="left">Described in <xref target="projectiontype-element"></xref></td> <td align="left">RFC 9559, <xref target="projectiontype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7672</td> <td align="right">0x7672</td>
<td align="left">ProjectionPrivate</td> <td align="left">ProjectionPrivate</td>
<td align="left">Described in <xref target="projectionprivate-element"></xref></ td> <td align="left">RFC 9559, <xref target="projectionprivate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7673</td> <td align="right">0x7673</td>
<td align="left">ProjectionPoseYaw</td> <td align="left">ProjectionPoseYaw</td>
<td align="left">Described in <xref target="projectionposeyaw-element"></xref></ td> <td align="left">RFC 9559, <xref target="projectionposeyaw-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7674</td> <td align="right">0x7674</td>
<td align="left">ProjectionPosePitch</td> <td align="left">ProjectionPosePitch</td>
<td align="left">Described in <xref target="projectionposepitch-element"></xref> </td> <td align="left">RFC 9559, <xref target="projectionposepitch-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x7675</td> <td align="right">0x7675</td>
<td align="left">ProjectionPoseRoll</td> <td align="left">ProjectionPoseRoll</td>
<td align="left">Described in <xref target="projectionposeroll-element"></xref>< /td> <td align="left">RFC 9559, <xref target="projectionposeroll-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x78B5</td> <td align="right">0x78B5</td>
<td align="left">OutputSamplingFrequency</td> <td align="left">OutputSamplingFrequency</td>
<td align="left">Described in <xref target="outputsamplingfrequency-element"></x ref></td> <td align="left">RFC 9559, <xref target="outputsamplingfrequency-element"></xref ></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7BA9</td> <td align="right">0x7BA9</td>
<td align="left">Title</td> <td align="left">Title</td>
<td align="left">Described in <xref target="title-element"></xref></td> <td align="left">RFC 9559, <xref target="title-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7D7B</td> <td align="right">0x7D7B</td>
<td align="left">ChannelPositions</td> <td align="left">ChannelPositions</td>
<td align="left">Reclaimed (<xref target="channelpositions-element"></xref>)</td > <td align="left">Reclaimed (RFC 9559, <xref target="channelpositions-element"></ xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x22B59C</td> <td align="right">0x22B59C</td>
<td align="left">Language</td> <td align="left">Language</td>
<td align="left">Described in <xref target="language-element"></xref></td> <td align="left">RFC 9559, <xref target="language-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x22B59D</td> <td align="right">0x22B59D</td>
<td align="left">LanguageBCP47</td> <td align="left">LanguageBCP47</td>
<td align="left">Described in <xref target="languagebcp47-element"></xref></td> <td align="left">RFC 9559, <xref target="languagebcp47-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x23314F</td> <td align="right">0x23314F</td>
<td align="left">TrackTimestampScale</td> <td align="left">TrackTimestampScale</td>
<td align="left">Described in <xref target="tracktimestampscale-element"></xref> </td> <td align="left">RFC 9559, <xref target="tracktimestampscale-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x234E7A</td> <td align="right">0x234E7A</td>
<td align="left">DefaultDecodedFieldDuration</td> <td align="left">DefaultDecodedFieldDuration</td>
<td align="left">Described in <xref target="defaultdecodedfieldduration-element" ></xref></td> <td align="left">RFC 9559, <xref target="defaultdecodedfieldduration-element"></ xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x2383E3</td> <td align="right">0x2383E3</td>
<td align="left">FrameRate</td> <td align="left">FrameRate</td>
<td align="left">Reclaimed (<xref target="framerate-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="framerate-element"></xref>)< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x23E383</td> <td align="right">0x23E383</td>
<td align="left">DefaultDuration</td> <td align="left">DefaultDuration</td>
<td align="left">Described in <xref target="defaultduration-element"></xref></td > <td align="left">RFC 9559, <xref target="defaultduration-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x258688</td> <td align="right">0x258688</td>
<td align="left">CodecName</td> <td align="left">CodecName</td>
<td align="left">Described in <xref target="codecname-element"></xref></td> <td align="left">RFC 9559, <xref target="codecname-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x26B240</td> <td align="right">0x26B240</td>
<td align="left">CodecDownloadURL</td> <td align="left">CodecDownloadURL</td>
<td align="left">Reclaimed (<xref target="codecdownloadurl-element"></xref>)</td > <td align="left">Reclaimed (RFC 9559, <xref target="codecdownloadurl-element"></ xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x2AD7B1</td> <td align="right">0x2AD7B1</td>
<td align="left">TimestampScale</td> <td align="left">TimestampScale</td>
<td align="left">Described in <xref target="timestampscale-element"></xref></td> <td align="left">RFC 9559, <xref target="timestampscale-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x2EB524</td> <td align="right">0x2EB524</td>
<td align="left">UncompressedFourCC</td> <td align="left">UncompressedFourCC</td>
<td align="left">Described in <xref target="uncompressedfourcc-element"></xref>< /td> <td align="left">RFC 9559, <xref target="uncompressedfourcc-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x2FB523</td> <td align="right">0x2FB523</td>
<td align="left">GammaValue</td> <td align="left">GammaValue</td>
<td align="left">Reclaimed (<xref target="gammavalue-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="gammavalue-element"></xref>) </td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3A9697</td> <td align="right">0x3A9697</td>
<td align="left">CodecSettings</td> <td align="left">CodecSettings</td>
<td align="left">Reclaimed (<xref target="codecsettings-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="codecsettings-element"></xre f>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3B4040</td> <td align="right">0x3B4040</td>
<td align="left">CodecInfoURL</td> <td align="left">CodecInfoURL</td>
<td align="left">Reclaimed (<xref target="codecinfourl-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="codecinfourl-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3C83AB</td> <td align="right">0x3C83AB</td>
<td align="left">PrevFilename</td> <td align="left">PrevFilename</td>
<td align="left">Described in <xref target="prevfilename-element"></xref></td> <td align="left">RFC 9559, <xref target="prevfilename-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3CB923</td> <td align="right">0x3CB923</td>
<td align="left">PrevUUID</td> <td align="left">PrevUUID</td>
<td align="left">Described in <xref target="prevuuid-element"></xref></td> <td align="left">RFC 9559, <xref target="prevuuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3E83BB</td> <td align="right">0x3E83BB</td>
<td align="left">NextFilename</td> <td align="left">NextFilename</td>
<td align="left">Described in <xref target="nextfilename-element"></xref></td> <td align="left">RFC 9559, <xref target="nextfilename-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3EB923</td> <td align="right">0x3EB923</td>
<td align="left">NextUUID</td> <td align="left">NextUUID</td>
<td align="left">Described in <xref target="nextuuid-element"></xref></td> <td align="left">RFC 9559, <xref target="nextuuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1043A770</td> <td align="right">0x1043A770</td>
<td align="left">Chapters</td> <td align="left">Chapters</td>
<td align="left">Described in <xref target="chapters-element"></xref></td> <td align="left">RFC 9559, <xref target="chapters-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x114D9B74</td> <td align="right">0x114D9B74</td>
<td align="left">SeekHead</td> <td align="left">SeekHead</td>
<td align="left">Described in <xref target="seekhead-element"></xref></td> <td align="left">RFC 9559, <xref target="seekhead-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1254C367</td> <td align="right">0x1254C367</td>
<td align="left">Tags</td> <td align="left">Tags</td>
<td align="left">Described in <xref target="tags-element"></xref></td> <td align="left">RFC 9559, <xref target="tags-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1549A966</td> <td align="right">0x1549A966</td>
<td align="left">Info</td> <td align="left">Info</td>
<td align="left">Described in <xref target="info-element"></xref></td> <td align="left">RFC 9559, <xref target="info-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1654AE6B</td> <td align="right">0x1654AE6B</td>
<td align="left">Tracks</td> <td align="left">Tracks</td>
<td align="left">Described in <xref target="tracks-element"></xref></td> <td align="left">RFC 9559, <xref target="tracks-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x18538067</td> <td align="right">0x18538067</td>
<td align="left">Segment</td> <td align="left">Segment</td>
<td align="left">Described in <xref target="segment-element"></xref></td> <td align="left">RFC 9559, <xref target="segment-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1941A469</td> <td align="right">0x1941A469</td>
<td align="left">Attachments</td> <td align="left">Attachments</td>
<td align="left">Described in <xref target="attachments-element"></xref></td> <td align="left">RFC 9559, <xref target="attachments-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1C53BB6B</td> <td align="right">0x1C53BB6B</td>
<td align="left">Cues</td> <td align="left">Cues</td>
<td align="left">Described in <xref target="cues-element"></xref></td> <td align="left">RFC 9559, <xref target="cues-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1F43B675</td> <td align="right">0x1F43B675</td>
<td align="left">Cluster</td> <td align="left">Cluster</td>
<td align="left">Described in <xref target="cluster-element"></xref></td> <td align="left">RFC 9559, <xref target="cluster-element"></xref></td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
<section anchor="chapter-codec-ids-registry"><name>Chapter Codec IDs Registry</n ame> <section anchor="chapter-codec-ids-registry"><name>Chapter Codec IDs Registry</n ame>
<t>This document creates a new IANA registry called the &quot;Matroska Chapter C odec IDs&quot; registry. <t>IANA has created a new registry called the "Matroska Chapter Codec IDs" regis try.
The values correspond to the unsigned integer <tt>ChapProcessCodecID</tt> value described in <xref target="chapprocesscodecid-element"></xref>.</t> The values correspond to the unsigned integer <tt>ChapProcessCodecID</tt> value described in <xref target="chapprocesscodecid-element"></xref>.</t>
<t>To register a new Chapter Codec ID in this registry, one needs a Chapter Code <t> To register a new Chapter Codec ID in this registry, one needs a Chapter
c ID, Codec ID, description, a Change Controller (IETF or email of registrant), and
a Change Controller (IETF or email of registrant) and
an optional Reference to a document describing the Chapter Codec ID.</t> an optional Reference to a document describing the Chapter Codec ID.</t>
<t>The Chapter Codec IDs are to be allocated according to the &quot;First Come F <t>The Chapter Codec IDs are to be allocated according to the "First Come First
irst Served&quot; policy <xref target="RFC8126"></xref>.</t> Served" policy <xref target="RFC8126"></xref>.</t>
<t><tt>ChapProcessCodecID</tt> values of &quot;0&quot; and &quot;1&quot; are RES <t>Values of "0" and "1" are reserved for future use (with the IETF as the Chang
ERVED to the IETF for future use.</t> e Controller).</t>
</section> </section>
<section anchor="media-types"><name>Media Types</name> <section anchor="media-types"><name>Media Types</name>
<t>Matroska files and streams are found in three main forms: audio-video files, <t> Matroska files and streams are found in three main forms: audio-video,
audio-only and occasionally with stereoscopic video tracks.</t> audio-only, and (occasionally) stereoscopic video.</t>
<t>Historically Matroska files and streams have used the following media types w <t>Historically, Matroska files and streams have used the following media types
ith a &quot;x-&quot; prefix. with an "x-" prefix.
For better compatibility a system <bcp14>SHOULD</bcp14> be able to handle both f For better compatibility, a system <bcp14>SHOULD</bcp14> be able to handle both
ormats. formats.
Newer systems <bcp14>SHOULD NOT</bcp14> use the historic format and use the form Newer systems <bcp14>SHOULD NOT</bcp14> use the historic format and use the form
at that follows the <xref target="RFC6838"></xref> format instead.</t> at that follows the format in <xref target="RFC6838"></xref> instead.</t>
<t>Please register three media types, the <xref target="RFC6838"></xref> templat <t>IANA has registered three media types per the templates (see <xref target="RF
es are below:</t> C6838"></xref>) in the following subsections.</t>
<section anchor="for-files-containing-video-tracks"><name>For files containing v ideo tracks</name> <section anchor="for-files-containing-video-tracks"><name>For Files Containing V ideo Tracks</name>
<dl spacing="compact"> <dl>
<dt>Type name:</dt> <dt>Type name:</dt>
<dd>video</dd> <dd>video</dd>
<dt>Subtype name:</dt> <dt>Subtype name:</dt>
<dd>matroska</dd> <dd>matroska</dd>
<dt>Required parameters:</dt> <dt>Required parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Optional parameters:</dt> <dt>Optional parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Encoding considerations:</dt> <dt>Encoding considerations:</dt>
<dd>as per this document and RFC8794</dd> <dd>As per RFCs 9559 and 8794</dd>
<dt>Security considerations:</dt> <dt>Security considerations:</dt>
<dd>See <xref target="security-considerations"></xref>.</dd> <dd>See <xref target="security-considerations"></xref> of RFC 9559.</dd>
<dt>Interoperability considerations:</dt> <dt>Interoperability considerations:</dt>
<dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries and UTF-8 usage allow for broad interopara bility.</dd> <dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries, and UTF-8 usage allow for broad interoper ability.</dd>
<dt>Published specification:</dt> <dt>Published specification:</dt>
<dd>THISRFC</dd> <dd>RFC 9559</dd>
<dt>Applications that use this media type:</dt> <dt>Applications that use this media type:</dt>
<dd>FFmpeg, VLC, ...</dd> <dd>FFmpeg, VLC, etc.</dd>
<dt>Fragment identifier considerations:</dt> <dt>Fragment identifier considerations:</dt>
<dd>N/A</dd> <dd>N/A</dd>
</dl> <dt>Additional information:</dt><dd>
<t>Additional information:</t> <t><br/></t>
<ul>
<li><t>Deprecated alias names for this type: video/x-matroska</t>
</li>
<li><t>Magic number(s): N/A</t>
</li>
<li><t>File extension(s): mkv</t>
</li>
<li><t>Macintosh file type code(s): N/A</t>
</li>
</ul>
<dl spacing="compact"> <dl spacing="compact">
<dt>Deprecated alias names for this type:</dt><dd>video/x-matroska</dd>
<dt>Magic number(s):</dt><dd>N/A</dd>
<dt>File extension(s):</dt><dd>mkv</dd>
<dt>Macintosh file type code(s):</dt><dd>N/A</dd>
</dl></dd>
<dt>Person &amp; email address to contact for further information:</dt> <dt>Person &amp; email address to contact for further information:</dt>
<dd>IETF CELLAR WG cellar@ietf.org</dd> <dd>IETF CELLAR WG (cellar@ietf.org)</dd>
<dt>Intended usage:</dt> <dt>Intended usage:</dt>
<dd>COMMON</dd> <dd>COMMON</dd>
<dt>Restrictions on usage:</dt> <dt>Restrictions on usage:</dt>
<dd>None</dd> <dd>None</dd>
<dt>Author:</dt> <dt>Author:</dt>
<dd>IETF CELLAR WG</dd> <dd>IETF CELLAR WG</dd>
<dt>Change controller:</dt> <dt>Change controller:</dt>
<dd>IETF</dd> <dd>IETF</dd>
<dt>Provisional registration? (standards tree only):</dt>
<dd>No</dd>
</dl> </dl>
</section> </section>
<section anchor="for-files-containing-audio-tracks-with-no-video-tracks"><name>F or files containing audio tracks with no video tracks</name> <section anchor="for-files-containing-audio-tracks-with-no-video-tracks"><name>F or Files Containing Audio Tracks with No Video Tracks</name>
<dl spacing="compact"> <dl>
<dt>Type name:</dt> <dt>Type name:</dt>
<dd>audio</dd> <dd>audio</dd>
<dt>Subtype name:</dt> <dt>Subtype name:</dt>
<dd>matroska</dd> <dd>matroska</dd>
<dt>Required parameters:</dt> <dt>Required parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Optional parameters:</dt> <dt>Optional parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Encoding considerations:</dt> <dt>Encoding considerations:</dt>
<dd>as per this document and RFC8794</dd> <dd>As per RFCs 9559 and 8794</dd>
<dt>Security considerations:</dt> <dt>Security considerations:</dt>
<dd>See <xref target="security-considerations"></xref>.</dd> <dd>See <xref target="security-considerations"></xref> of RFC 9559.</dd>
<dt>Interoperability considerations:</dt> <dt>Interoperability considerations:</dt>
<dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries and UTF-8 usage allow for broad interopara bility.</dd> <dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries, and UTF-8 usage allow for broad interoper ability.</dd>
<dt>Published specification:</dt> <dt>Published specification:</dt>
<dd>THISRFC</dd> <dd>RFC 9559</dd>
<dt>Applications that use this media type:</dt> <dt>Applications that use this media type:</dt>
<dd>FFmpeg, VLC, ...</dd> <dd>FFmpeg, VLC, ...</dd>
<dt>Fragment identifier considerations:</dt> <dt>Fragment identifier considerations:</dt>
<dd>N/A</dd> <dd>N/A</dd>
</dl> <dt>Additional information:</dt><dd>
<t>Additional information:</t> <t><br/></t>
<ul>
<li><t>Deprecated alias names for this type: audio/x-matroska</t>
</li>
<li><t>Magic number(s): N/A</t>
</li>
<li><t>File extension(s): mka</t>
</li>
<li><t>Macintosh file type code(s): N/A</t>
</li>
</ul>
<dl spacing="compact"> <dl spacing="compact">
<dt>Deprecated alias names for this type:</dt><dd>audio/x-matroska</dd>
<dt>Magic number(s):</dt><dd>N/A</dd>
<dt>File extension(s):</dt><dd>mka</dd>
<dt>Macintosh file type code(s):</dt><dd>N/A</dd>
</dl>
</dd></dl>
<dl>
<dt>Person &amp; email address to contact for further information:</dt> <dt>Person &amp; email address to contact for further information:</dt>
<dd>IETF CELLAR WG cellar@ietf.org</dd> <dd>IETF CELLAR WG (cellar@ietf.org)</dd>
<dt>Intended usage:</dt> <dt>Intended usage:</dt>
<dd>COMMON</dd> <dd>COMMON</dd>
<dt>Restrictions on usage:</dt> <dt>Restrictions on usage:</dt>
<dd>None</dd> <dd>None</dd>
<dt>Author:</dt> <dt>Author:</dt>
<dd>IETF CELLAR WG</dd> <dd>IETF CELLAR WG</dd>
<dt>Change controller:</dt> <dt>Change controller:</dt>
<dd>IETF</dd> <dd>IETF</dd>
<dt>Provisional registration? (standards tree only):</dt>
<dd>No</dd>
</dl> </dl>
</section> </section>
<section anchor="for-files-containing-a-stereoscopic-video-track"><name>For file s containing a stereoscopic video track</name> <section anchor="for-files-containing-a-stereoscopic-video-track"><name>For File s Containing a Stereoscopic Video Track</name>
<dl spacing="compact"> <dl>
<dt>Type name:</dt> <dt>Type name:</dt>
<dd>video</dd> <dd>video</dd>
<dt>Subtype name:</dt> <dt>Subtype name:</dt>
<dd>matroska-3d</dd> <dd>matroska-3d</dd>
<dt>Required parameters:</dt> <dt>Required parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Optional parameters:</dt> <dt>Optional parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Encoding considerations:</dt> <dt>Encoding considerations:</dt>
<dd>as per this document and RFC8794</dd> <dd>As per RFCs 9559 and 8794 </dd>
<dt>Security considerations:</dt> <dt>Security considerations:</dt>
<dd>See <xref target="security-considerations"></xref>.</dd> <dd>See <xref target="security-considerations"></xref> of RFC 9559.</dd>
<dt>Interoperability considerations:</dt> <dt>Interoperability considerations:</dt>
<dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries and UTF-8 usage allow for broad interopara bility.</dd> <dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries, and UTF-8 usage allow for broad interoper ability.</dd>
<dt>Published specification:</dt> <dt>Published specification:</dt>
<dd>THISRFC</dd> <dd>RFC 9559</dd>
<dt>Applications that use this media type:</dt> <dt>Applications that use this media type:</dt>
<dd>FFmpeg, VLC, ...</dd> <dd>FFmpeg, VLC, ...</dd>
<dt>Fragment identifier considerations:</dt> <dt>Fragment identifier considerations:</dt>
<dd>N/A</dd> <dd>N/A</dd>
</dl> <dt>Additional information:</dt><dd>
<t>Additional information:</t> <t><br/></t>
<ul>
<li><t>Deprecated alias names for this type: video/x-matroska-3d</t>
</li>
<li><t>Magic number(s): N/A</t>
</li>
<li><t>File extension(s): mk3d</t>
</li>
<li><t>Macintosh file type code(s): N/A</t>
</li>
</ul>
<dl spacing="compact"> <dl spacing="compact">
<dt>Deprecated alias names for this type:</dt><dd>video/x-matroska-3d</dd>
<dt>Magic number(s):</dt><dd>N/A</dd>
<dt>File extension(s):</dt><dd>mk3d</dd>
<dt>Macintosh file type code(s):</dt><dd>N/A</dd>
</dl>
</dd></dl>
<dl>
<dt>Person &amp; email address to contact for further information:</dt> <dt>Person &amp; email address to contact for further information:</dt>
<dd>IETF CELLAR WG cellar@ietf.org</dd> <dd>IETF CELLAR WG (cellar@ietf.org)</dd>
<dt>Intended usage:</dt> <dt>Intended usage:</dt>
<dd>COMMON</dd> <dd>COMMON</dd>
<dt>Restrictions on usage:</dt> <dt>Restrictions on usage:</dt>
<dd>None</dd> <dd>None</dd>
<dt>Author:</dt> <dt>Author:</dt>
<dd>IETF CELLAR WG</dd> <dd>IETF CELLAR WG</dd>
<dt>Change controller:</dt> <dt>Change controller:</dt>
<dd>IETF</dd> <dd>IETF</dd>
<dt>Provisional registration? (standards tree only):</dt>
<dd>No</dd>
</dl> </dl>
</section> </section>
</section> </section>
</section> </section>
<section anchor="annex-a-historic-deprecated-elements"><name>Annex A: Historic D </middle>
eprecated Elements</name>
<t>As Matroska evolved since 2002 many parts that were considered for use in the <back>
format were never
used and often incorrectly designed. Many of the elements that were then defined <displayreference target="I-D.ietf-cellar-codec" to="MatroskaCodec"/>
are not <displayreference target="I-D.ietf-cellar-tags" to="MatroskaTags"/>
<references><name>References</name>
<references><name>Normative References</name>
<reference anchor="CIE-1931" target="https://en.wikipedia.org/wiki/CIE_1931_colo
r_space">
<front>
<title>CIE 1931 color space</title>
<author>
<organization>Wikipedia</organization>
</author>
</front>
</reference>
<reference anchor="ISO639-2" target="https://www.loc.gov/standards/iso639-2/php/
code_list.php">
<front>
<title>Codes for the Representation of Names of Languages</title>
<author>
<organization>International Organization for Standardization</organization
>
</author>
<date year="2017" month="December"></date>
</front>
<seriesInfo name="ISO" value="639-2"></seriesInfo>
</reference>
<reference anchor="ISO9899" target="https://www.iso.org/standard/74528.html">
<front>
<title>Information technology -- Programming languages -- C</title>
<author>
<organization>International Organization for Standardization</organization
>
</author>
<date month="June" year="2018"></date>
</front>
<seriesInfo name="ISO/IEC" value="9899:2018"></seriesInfo>
</reference>
<reference anchor="ITU-H.273" target="https://www.itu.int/rec/T-REC-H.273-202309
-P/en">
<front>
<title>Coding-independent code points for video signal type identification</
title>
<author>
<organization>ITU-T</organization>
</author>
<date year="2023" month="September"></date>
</front>
<seriesInfo name="ITU-T Recommendation" value="H.273"></seriesInfo>
</reference>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.1950.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.2119.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.4122.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.5646.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6838.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8081.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8126.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8174.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8794.xml"
/>
</references>
<references><name>Informative References</name>
<reference anchor="Err7189" quote-title="false" target="https://www.rfc-editor.o
rg/errata/eid7189">
<front>
<title>Erratum ID 7189</title>
<author>
<organization>RFC Errata</organization>
</author>
</front>
<refcontent>RFC 8794</refcontent>
</reference>
<reference anchor="Err7191" quote-title="false" target="https://www.rfc-editor.o
rg/errata/eid7191">
<front>
<title>Erratum ID 7191</title>
<author>
<organization>RFC Errata</organization>
</author>
</front>
<refcontent>RFC 8794</refcontent>
</reference>
<reference anchor="AVIFormat" target="https://docs.microsoft.com/en-us/windows/w
in32/directshow/avi-riff-file-reference">
<front>
<title>AVI RIFF File Reference</title>
<author>
<organization>Microsoft Corporation</organization> </author> <date year="2
023"
month="June"></date> </front> </reference> <reference anchor="BZIP2"
target="https://sourceware.org/bzip2/"> <front> <title>bzip2</title>
<author fullname="Julian Seward" initials="J." surname="Seward">
<organization></organization>
</author>
<date year="2019" month="July"></date>
</front>
</reference>
<reference anchor="Blowfish" target="https://www.schneier.com/academic/blowfish/
">
<front>
<title>The Blowfish Encryption Algorithm</title>
<author fullname="Bruce Schneier" initials="B." surname="Schneier">
<organization></organization>
</author>
<date year="1993"></date>
</front>
</reference>
<reference anchor="DVD-Video" target="http://www.dvdforum.org/">
<front>
<title>DVD-Books: Part 3 DVD-Video Book</title>
<author>
<organization>DVD Forum</organization>
</author>
<date year="1995" month="November"></date>
</front>
</reference>
<reference anchor="DivXTrickTrack" target="https://web.archive.org/web/201012220
01148/http://labs.divx.com/node/16601">
<front>
<title>Smooth FF/RW</title>
<author></author>
<date year="2010" month="December"></date>
</front>
</reference>
<reference anchor="DivXWorldFonts" target="https://web.archive.org/web/201102141
32246/http://labs.divx.com/node/16602">
<front>
<title>World Fonts</title>
<author></author>
<date year="2010" month="December"></date>
</front>
</reference>
<reference anchor="FIPS197" target="https://csrc.nist.gov/publications/detail/fi
ps/197/final">
<front>
<title>Advanced Encryption Standard (AES)</title>
<author>
<organization>National Institute of Standards and Technology (NIST)</organ
ization>
</author>
<date year="2001" month="November"></date>
</front>
<seriesInfo name="FIPS" value="PUB 197"></seriesInfo>
<seriesInfo name="DOI" value="10.6028/NIST.FIPS.197"></seriesInfo>
</reference>
<reference anchor="FIPS46-3" target="https://csrc.nist.gov/publications/detail/f
ips/46/3/archive/1999-10-25">
<front>
<title>Data Encryption Standard (DES)</title>
<author>
<organization>National Institute of Standards and Technology (NIST)</organ
ization>
</author>
<date year="1999" month="October"></date>
</front>
<seriesInfo name="FIPS" value="PUB 46"></seriesInfo>
</reference>
<reference anchor="FourCC-RGB" target="https://web.archive.org/web/2016060921480
6/https://www.fourcc.org/rgb.php">
<front>
<title>RGB pixel formats</title>
<author>
<organization>FOURCC</organization>
</author>
</front>
</reference>
<reference anchor="FourCC-YUV" target="https://web.archive.org/web/2016060921480
6/https://www.fourcc.org/yuv.php">
<front>
<title>YUV pixel formats</title>
<author>
<organization>FOURCC</organization>
</author>
</front>
</reference>
<reference anchor="JPEG" target="https://www.w3.org/Graphics/JPEG/itu-t81.pdf">
<front>
<title>INFORMATION TECHNOLOGY - DIGITAL COMPRESSION AND CODING OF
CONTINUOUS-TONE STILL IMAGES - REQUIREMENTS AND GUIDELINES</title>
<author>
<organization>ITU-T</organization>
</author>
<date year="1992" month="September"></date>
</front>
<seriesInfo name="ITU-T Recommendation" value="T.81"></seriesInfo>
</reference>
<reference anchor="LZO" target="https://www.kernel.org/doc/Documentation/lzo.txt
">
<front>
<title>LZO stream format as understood by Linux's LZO decompressor</title>
<author fullname="Willy Tarreau" initials="W." surname="Tarreau">
<organization></organization>
</author>
<author fullname="Dave Rodgman" initials="R." surname="Rodgman">
<organization></organization>
</author>
<date year="2018" month="October"></date>
</front>
</reference>
<reference anchor="MCF" target="http://mukoli.free.fr/mcf/">
<front>
<title>MCF specification, introduction</title>
<author></author>
</front>
</reference>
<reference anchor="MSRGB" target="https://learn.microsoft.com/en-us/openspecs/wi
ndows_protocols/ms-wmf/4e588f70-bd92-4a6f-b77f-35d0feaf7a57">
<front>
<title>Compression Enumeration</title>
<author>
<organization>Microsoft Corporation</organization>
</author>
<date month="June" year="2021"/>
</front>
</reference>
<reference anchor="MSYUV16" target="https://learn.microsoft.com/en-us/windows/wi
n32/medfound/10-bit-and-16-bit-yuv-video-formats">
<front>
<title>10-bit and 16-bit YUV Video Formats</title>
<author>
<organization>Microsoft Corporation</organization>
</author>
<date month="November" year="2022"/>
</front>
</reference>
<reference anchor="MSYUV8" target="https://learn.microsoft.com/en-us/windows/win
32/medfound/recommended-8-bit-yuv-formats-for-video-rendering">
<front>
<title>Recommended 8-Bit YUV Formats for Video Rendering</title>
<author>
<organization>Microsoft Corporation</organization>
</author>
<date month="January" year="2021"/>
</front>
</reference>
<!-- IESG state: I-D Exists as of 3/1 -->
<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.ietf-ce
llar-codec.xml"/>
<!-- IESG state: I-D Exists as of 3/1 -->
<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.ietf-ce
llar-tags.xml"/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.0959.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.2083.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.3533.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.4732.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.9110.xml"
/>
<reference anchor="SMB-CIFS" target="https://winprotocoldoc.blob.core.windows.ne
t/productionwindowsarchives/MS-CIFS/%5bMS-CIFS%5d.pdf">
<front>
<title>[MS-CIFS]: Common Internet File System (CIFS) Protocol</title>
<author>
<organization>Microsoft Corporation</organization>
</author>
<date year="2020" month="October"/>
</front>
</reference>
<reference anchor="SP800-38A" target="https://nvlpubs.nist.gov/nistpubs/Legacy/S
P/nistspecialpublication800-38a.pdf">
<front>
<title>Recommendation for Block Cipher Modes of Operation: Methods and Techn
iques</title>
<author>
<organization>National Institute of Standards and Technology (NIST)</organ
ization>
</author>
<date year="2001" month="December"></date>
</front>
<seriesInfo name="DOI" value="10.6028/NIST.SP.800-38A"></seriesInfo>
<seriesInfo name="NIST Special Publication" value="800-38A"/>
</reference>
<reference anchor="SP800-67" target="https://nvlpubs.nist.gov/nistpubs/SpecialPu
blications/NIST.SP.800-67r2.pdf">
<front>
<title>Recommendation for the Triple Data Encryption Algorithm (TDEA) Block
Cipher</title>
<author>
<organization>National Institute of Standards and Technology (NIST)</organ
ization>
</author>
<date year="2017" month="November"></date>
</front>
<seriesInfo name="DOI" value="10.6028/NIST.SP.800-67r2"></seriesInfo>
<seriesInfo name="NIST Special Publication" value="800-67"/>
</reference>
<reference anchor="Twofish" target="https://www.schneier.com/academic/archives/1
998/06/twofish_a_128-bit_bl.html">
<front>
<title>Twofish: A 128-Bit Block Cipher</title>
<author fullname="Bruce Schneier" initials="B." surname="Schneier">
<organization></organization>
</author>
<author fullname="John Kelsey" initials="J." surname="Kelsey">
<organization></organization>
</author>
<author fullname="Doug Whiting" initials="D." surname="Whiting">
<organization></organization>
</author>
<author fullname="David Wagner" initials="D." surname="Wagner">
<organization></organization>
</author>
<author fullname="Chris Hall" initials="C." surname="Hall">
<organization></organization>
</author>
<author fullname="Niels Ferguson" initials="N." surname="Ferguson">
<organization></organization>
</author>
<date year="1998" month="June"></date>
</front>
</reference>
<reference anchor="WebM-Enc" target="https://www.webmproject.org/docs/webm-encry
ption/">
<front>
<title>WebM Encryption</title>
<author fullname="Frank Galligan">
<organization>Google</organization>
</author>
<date year="2016" month="September"></date>
</front>
</reference>
<reference anchor="WebVTT" target="https://www.w3.org/TR/2019/CR-webvtt1-2019040
4/">
<front>
<title>WebVTT: The Web Video Text Tracks Format</title>
<author fullname="Simon Pieters">
<organization>Opera Software AS</organization>
</author>
<author fullname="Silvia Pfeiffer" role="editor">
<organization>NICTA</organization>
</author>
<author fullname="Philip Jaegenstedt">
<organization>Opera Software ASA</organization>
</author>
<author fullname="Ian Hickson">
<organization>Google</organization>
</author>
<date year="2019" month="April"></date>
</front>
<refcontent>W3C Candidate Recommendation</refcontent>
</reference>
<reference anchor="libmatroska" target="https://github.com/Matroska-Org/libmatro
ska">
<front>
<title>libmatroska</title>
<author/><date year="2024" month="March"></date>
</front>
</reference>
</references>
</references>
<section anchor="appendix-a-historic-deprecated-elements"><name>Historic Depreca
ted Elements</name>
<t>As Matroska has evolved since 2002, many parts that were considered for use i
n the format were never
used and often incorrectly designed. Many of the elements that were defined then
are not
found in any known files but were part of public specs. DivX also had a few cust om elements that found in any known files but were part of public specs. DivX also had a few cust om elements that
were designed for custom features.</t> were designed for custom features.</t>
<t>We list these elements that have a known ID that <bcp14>SHOULD NOT</bcp14> be <t>In this appendix, we list elements that have a known ID that <bcp14>SHOULD NO
reused to avoid colliding T</bcp14> be reused to avoid colliding
with existing files. They might be reassigned by IANA in the future if there are with existing files. These might be reassigned by IANA in the future if there ar
no more IDs for a given size. e no more IDs for a given size.
A short description of what each ID was used for is included, but the text is no t normative.</t> A short description of what each ID was used for is included, but the text is no t normative.</t>
<section anchor="silenttracks-element"><name>SilentTracks Element</name> <section anchor="silenttracks-element"><name>SilentTracks Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>master / 0x5854</dd> <dd>master / 0x5854</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\SilentTracks</tt></dd> <dd><tt>\Segment\Cluster\SilentTracks</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The list of tracks that are not used in that part of the stream. <dd>The list of tracks that are not used in that part of the stream.
It is useful when using overlay tracks on seeking or to decide what track to use .</dd> It is useful when using overlay tracks for seeking or deciding what track to use .</dd>
</dl> </dl>
</section> </section>
<section anchor="silenttracknumber-element"><name>SilentTrackNumber Element</nam e> <section anchor="silenttracknumber-element"><name>SilentTrackNumber Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x58D7</dd> <dd>uinteger / 0x58D7</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\SilentTracks\SilentTrackNumber</tt></dd> <dd><tt>\Segment\Cluster\SilentTracks\SilentTrackNumber</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>One of the track number that are not used from now on in the stream. <dd>One of the track numbers that is not used from now on in the stream.
It could change later if not specified as silent in a further Cluster.</dd> It could change later if not specified as silent in a further <tt>Cluster</tt>.<
/dd>
</dl> </dl>
</section> </section>
<section anchor="blockvirtual-element"><name>BlockVirtual Element</name> <section anchor="blockvirtual-element"><name>BlockVirtual Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0xA2</dd> <dd>binary / 0xA2</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\BlockVirtual</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\BlockVirtual</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>A Block with no data. It must be stored in the stream at the place the real Block would be in display order.</dd> <dd>A <tt>Block</tt> with no data. It must be stored in the stream at the place the real <tt>Block</tt> would be in display order.</dd>
</dl> </dl>
</section> </section>
<section anchor="referencevirtual-element"><name>ReferenceVirtual Element</name> <section anchor="referencevirtual-element"><name>ReferenceVirtual Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>integer / 0xFD</dd> <dd>integer / 0xFD</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\ReferenceVirtual</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\ReferenceVirtual</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The Segment Position of the data that would otherwise be in position of the virtual block.</dd> <dd>The <tt>Segment Position</tt> of the data that would otherwise be in positio n of the virtual block.</dd>
</dl> </dl>
</section> </section>
<section anchor="slices-element"><name>Slices Element</name> <section anchor="slices-element"><name>Slices Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>master / 0x8E</dd> <dd>master / 0x8E</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\Slices</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\Slices</tt></dd>
skipping to change at line 9516 skipping to change at line 10098
<section anchor="framenumber-element"><name>FrameNumber Element</name> <section anchor="framenumber-element"><name>FrameNumber Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xCD</dd> <dd>uinteger / 0xCD</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\Slices\TimeSlice\FrameNumber</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\Slices\TimeSlice\FrameNumber</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The number of the frame to generate from this lace with this delay <dd>The number of the frame to generate from this lace with this delay
(allow you to generate many frames from the same Block/Frame).</dd> (allows for the generation of many frames from the same Block/Frame).</dd>
</dl> </dl>
</section> </section>
<section anchor="blockadditionid-element"><name>BlockAdditionID Element</name> <section anchor="blockadditionid-element"><name>BlockAdditionID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xCB</dd> <dd>uinteger / 0xCB</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\Slices\TimeSlice\BlockAdditionID</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\Slices\TimeSlice\BlockAdditionID</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The ID of the BlockAdditional Element (0 is the main Block).</dd> <dd>The ID of the <tt>BlockAdditional</tt> Element (0 is the main Block).</dd>
</dl> </dl>
</section> </section>
<section anchor="delay-element"><name>Delay Element</name> <section anchor="delay-element"><name>Delay Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xCE</dd> <dd>uinteger / 0xCE</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\Slices\TimeSlice\Delay</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\Slices\TimeSlice\Delay</tt></dd>
skipping to change at line 9576 skipping to change at line 10158
</section> </section>
<section anchor="referenceoffset-element"><name>ReferenceOffset Element</name> <section anchor="referenceoffset-element"><name>ReferenceOffset Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xC9</dd> <dd>uinteger / 0xC9</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\ReferenceFrame\ReferenceOffset</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\ReferenceFrame\ReferenceOffset</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The relative offset, in bytes, from the previous BlockGroup element for this <dd>The relative offset, in bytes, from the previous <tt>BlockGroup</tt> element
Smooth FF/RW video track to the containing BlockGroup element. See <xref target for this Smooth FF/RW video track to the containing <tt>BlockGroup</tt>
="DivXTrickTrack"></xref>.</dd> element. See <xref target="DivXTrickTrack"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="referencetimestamp-element"><name>ReferenceTimestamp Element</n ame> <section anchor="referencetimestamp-element"><name>ReferenceTimestamp Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xCA</dd> <dd>uinteger / 0xCA</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\ReferenceFrame\ReferenceTimestamp</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\ReferenceFrame\ReferenceTimestamp</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The timestamp of the BlockGroup pointed to by ReferenceOffset, expressed in <dd>The timestamp of the <tt>BlockGroup</tt> pointed to by ReferenceOffset, expr
Track Ticks; see <xref target="timestamp-ticks"></xref>. See <xref target="DivXT essed in Track Ticks; see <xref
rickTrack"></xref>.</dd> target="timestamp-ticks"></xref>. See <xref target="DivXTrickTrack"></xref>.</dd
>
</dl> </dl>
</section> </section>
<section anchor="encryptedblock-element"><name>EncryptedBlock Element</name> <section anchor="encryptedblock-element"><name>EncryptedBlock Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0xAF</dd> <dd>binary / 0xAF</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\EncryptedBlock</tt></dd> <dd><tt>\Segment\Cluster\EncryptedBlock</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Similar to SimpleBlock, see <xref target="simpleblock-structure"></xref>, <dd>Similar to <tt>SimpleBlock</tt> (see <xref target="simpleblock-structure"></
but the data inside the Block are Transformed (encrypt and/or signed).</dd> xref>),
but the data inside the <tt>Block</tt> are Transformed (encrypted and/or signed)
.</dd>
</dl> </dl>
</section> </section>
<section anchor="mincache-element"><name>MinCache Element</name> <section anchor="mincache-element"><name>MinCache Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x6DE7</dd> <dd>uinteger / 0x6DE7</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\MinCache</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\MinCache</tt></dd>
skipping to change at line 9639 skipping to change at line 10223
</section> </section>
<section anchor="trackoffset-element"><name>TrackOffset Element</name> <section anchor="trackoffset-element"><name>TrackOffset Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>integer / 0x537F</dd> <dd>integer / 0x537F</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOffset</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOffset</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>A value to add to the Block's Timestamp, expressed in Matroska Ticks -- i.e. <dd>A value to add to the Block's Timestamp, expressed in Matroska Ticks -- i.e.
, in nanoseconds; see <xref target="timestamp-ticks"></xref>. , in nanoseconds; see <xref
target="timestamp-ticks"></xref>.
This can be used to adjust the playback offset of a track.</dd> This can be used to adjust the playback offset of a track.</dd>
</dl> </dl>
</section> </section>
<section anchor="codecsettings-element"><name>CodecSettings Element</name> <section anchor="codecsettings-element"><name>CodecSettings Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>utf-8 / 0x3A9697</dd> <dd>utf-8 / 0x3A9697</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 9676 skipping to change at line 10261
</section> </section>
<section anchor="codecdownloadurl-element"><name>CodecDownloadURL Element</name> <section anchor="codecdownloadurl-element"><name>CodecDownloadURL Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>string / 0x26B240</dd> <dd>string / 0x26B240</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\CodecDownloadURL</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\CodecDownloadURL</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>A URL to download about the codec used.</dd> <dd>A URL to download information about the codec used.</dd>
</dl> </dl>
</section> </section>
<section anchor="codecdecodeall-element"><name>CodecDecodeAll Element</name> <section anchor="codecdecodeall-element"><name>CodecDecodeAll Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xAA</dd> <dd>uinteger / 0xAA</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\CodecDecodeAll</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\CodecDecodeAll</tt></dd>
skipping to change at line 9701 skipping to change at line 10286
<section anchor="trackoverlay-element"><name>TrackOverlay Element</name> <section anchor="trackoverlay-element"><name>TrackOverlay Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x6FAB</dd> <dd>uinteger / 0x6FAB</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOverlay</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOverlay</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Specify that this track is an overlay track for the Track specified (in the u-integer). <dd>Specify that this track is an overlay track for the Track specified (in the u-integer).
That means when this track has a gap on SilentTracks, This means that when this track has a gap on SilentTracks, the overlay track sho
the overlay track should be used instead. The order of multiple TrackOverlay mat uld be used instead. The order of multiple TrackOverlay matters; the first one i
ters, the first one is the one that should be used. s the one that should be used.
If not found it should be the second, etc.</dd> If the first one is not found, it should be the second, etc.</dd>
</dl> </dl>
</section> </section>
<section anchor="aspectratiotype-element"><name>AspectRatioType Element</name> <section anchor="aspectratiotype-element"><name>AspectRatioType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x54B3</dd> <dd>uinteger / 0x54B3</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\AspectRatioType</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\AspectRatioType</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Specify the possible modifications to the aspect ratio.</dd> <dd>Specifies the possible modifications to the aspect ratio.</dd>
<!-- [cellar] fix imperative verb at the beggining of a definition -->
</dl> </dl>
</section> </section>
<section anchor="gammavalue-element"><name>GammaValue Element</name> <section anchor="gammavalue-element"><name>GammaValue Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>float / 0x2FB523</dd> <dd>float / 0x2FB523</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\GammaValue</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\GammaValue</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Gamma Value.</dd> <dd>Gamma value.</dd>
</dl> </dl>
</section> </section>
<section anchor="framerate-element"><name>FrameRate Element</name> <section anchor="framerate-element"><name>FrameRate Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>float / 0x2383E3</dd> <dd>float / 0x2383E3</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\FrameRate</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\FrameRate</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Number of frames per second. This value is Informational only. It is intende <dd>Number of frames per second. This value is informational only. It is intende
d for constant frame rate streams, and should not be used for a variable frame r d for constant frame rate streams and should not be
ate TrackEntry.</dd> used for a variable frame rate <tt>TrackEntry</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="channelpositions-element"><name>ChannelPositions Element</name> <section anchor="channelpositions-element"><name>ChannelPositions Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0x7D7B</dd> <dd>binary / 0x7D7B</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio\ChannelPositions</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio\ChannelPositions</tt></dd>
skipping to change at line 9763 skipping to change at line 10351
</section> </section>
<section anchor="tricktrackuid-element"><name>TrickTrackUID Element</name> <section anchor="tricktrackuid-element"><name>TrickTrackUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xC0</dd> <dd>uinteger / 0xC0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrickTrackUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrickTrackUID</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The TrackUID of the Smooth FF/RW video in the paired EBML structure correspo <dd>The <tt>TrackUID</tt> of the Smooth FF/RW video in the paired EBML structure
nding to this video track. See <xref target="DivXTrickTrack"></xref>.</dd> corresponding to this video track. See <xref
target="DivXTrickTrack"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="tricktracksegmentuid-element"><name>TrickTrackSegmentUID Elemen t</name> <section anchor="tricktracksegmentuid-element"><name>TrickTrackSegmentUID Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0xC1</dd> <dd>binary / 0xC1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrickTrackSegmentUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrickTrackSegmentUID</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The SegmentUID of the Segment containing the track identified by TrickTrackU ID. See <xref target="DivXTrickTrack"></xref>.</dd> <dd>The SegmentUID of the <tt>Segment</tt> containing the track identified by Tr ickTrackUID. See <xref target="DivXTrickTrack"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="tricktrackflag-element"><name>TrickTrackFlag Element</name> <section anchor="tricktrackflag-element"><name>TrickTrackFlag Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xC6</dd> <dd>uinteger / 0xC6</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrickTrackFlag</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrickTrackFlag</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Set to 1 if this video track is a Smooth FF/RW track. If set to 1, MasterTra <dd>Set to 1 if this video track is a Smooth FF/RW track. If set to 1, MasterTra
ckUID and MasterTrackSegUID should be present and BlockGroups for this track mus ckUID and MasterTrackSegUID should be present, and
t contain ReferenceFrame structures. <tt>BlockGroups</tt> for this track must contain ReferenceFrame structures.
Otherwise, TrickTrackUID and TrickTrackSegUID must be present if this track has Otherwise, TrickTrackUID and TrickTrackSegUID must be present if this track has
a corresponding Smooth FF/RW track. See <xref target="DivXTrickTrack"></xref>.</ a corresponding Smooth FF/RW track. See <xref
dd> target="DivXTrickTrack"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="trickmastertrackuid-element"><name>TrickMasterTrackUID Element< /name> <section anchor="trickmastertrackuid-element"><name>TrickMasterTrackUID Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xC7</dd> <dd>uinteger / 0xC7</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrickMasterTrackUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrickMasterTrackUID</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The TrackUID of the video track in the paired EBML structure that correspond <dd>The <tt>TrackUID</tt> of the video track in the paired EBML structure that c
s to this Smooth FF/RW track. See <xref target="DivXTrickTrack"></xref>.</dd> orresponds to this Smooth FF/RW track. See <xref
target="DivXTrickTrack"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="trickmastertracksegmentuid-element"><name>TrickMasterTrackSegme ntUID Element</name> <section anchor="trickmastertracksegmentuid-element"><name>TrickMasterTrackSegme ntUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0xC4</dd> <dd>binary / 0xC4</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrickMasterTrackSegmentUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrickMasterTrackSegmentUID</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The SegmentUID of the Segment containing the track identified by MasterTrack UID. See <xref target="DivXTrickTrack"></xref>.</dd> <dd>The SegmentUID of the <tt>Segment</tt> containing the track identified by Ma sterTrackUID. See <xref target="DivXTrickTrack"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="contentsignature-element"><name>ContentSignature Element</name> <section anchor="contentsignature-element"><name>ContentSignature Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0x47E3</dd> <dd>binary / 0x47E3</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentSignature</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentSignature</tt></dd>
skipping to change at line 9836 skipping to change at line 10428
</section> </section>
<section anchor="contentsigkeyid-element"><name>ContentSigKeyID Element</name> <section anchor="contentsigkeyid-element"><name>ContentSigKeyID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0x47E4</dd> <dd>binary / 0x47E4</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentSigKeyID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentSigKeyID</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>This is the ID of the private key the data was signed with.</dd> <dd>This is the ID of the private key that the data was signed with.</dd>
</dl> </dl>
</section> </section>
<section anchor="contentsigalgo-element"><name>ContentSigAlgo Element</name> <section anchor="contentsigalgo-element"><name>ContentSigAlgo Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x47E5</dd> <dd>uinteger / 0x47E5</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentSigAlgo</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentSigAlgo</tt></dd>
skipping to change at line 9872 skipping to change at line 10464
</section> </section>
<section anchor="cuerefcluster-element"><name>CueRefCluster Element</name> <section anchor="cuerefcluster-element"><name>CueRefCluster Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x97</dd> <dd>uinteger / 0x97</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference\CueRefCluster</tt> </dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference\CueRefCluster</tt> </dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The Segment Position of the Cluster containing the referenced Block.</dd> <dd>The <tt>Segment Position</tt> of the <tt>Cluster</tt> containing the referen ced Block.</dd>
</dl> </dl>
</section> </section>
<section anchor="cuerefnumber-element"><name>CueRefNumber Element</name> <section anchor="cuerefnumber-element"><name>CueRefNumber Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x535F</dd> <dd>uinteger / 0x535F</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference\CueRefNumber</tt>< /dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference\CueRefNumber</tt>< /dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Number of the referenced Block of Track X in the specified Cluster.</dd> <dd>Number of the referenced <tt>Block</tt> of Track X in the specified <tt>Clus ter</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="cuerefcodecstate-element"><name>CueRefCodecState Element</name> <section anchor="cuerefcodecstate-element"><name>CueRefCodecState Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xEB</dd> <dd>uinteger / 0xEB</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference\CueRefCodecState</ tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference\CueRefCodecState</ tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The Segment Position of the Codec State corresponding to this referenced Ele <dd>The <tt>Segment Position</tt> of the Codec State corresponding to this refer
ment. enced Element.
0 means that the data is taken from the initial Track Entry.</dd> 0 means that the data is taken from the initial <tt>TrackEntry</tt>.</dd>
</dl> </dl>
</section> </section>
<section anchor="filereferral-element"><name>FileReferral Element</name> <section anchor="filereferral-element"><name>FileReferral Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0x4675</dd> <dd>binary / 0x4675</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileReferral</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileReferral</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>A binary value that a track/codec can refer to when the attachment is needed .</dd> <dd>A binary value that a track/codec can refer to when the attachment is needed .</dd>
</dl> </dl>
</section> </section>
<section anchor="fileusedstarttime-element"><name>FileUsedStartTime Element</nam e> <section anchor="fileusedstarttime-element"><name>FileUsedStartTime Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x4661</dd> <dd>uinteger / 0x4661</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileUsedStartTime</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileUsedStartTime</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The timestamp at which this optimized font attachment comes into context, ex <dd>The timestamp at which this optimized font attachment comes into context, ex
pressed in Segment Ticks which is based on TimestampScale. See <xref target="Div pressed in Segment Ticks, which are based on
XWorldFonts"></xref>.</dd> <tt>TimestampScale</tt>. See <xref target="DivXWorldFonts"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="fileusedendtime-element"><name>FileUsedEndTime Element</name> <section anchor="fileusedendtime-element"><name>FileUsedEndTime Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x4662</dd> <dd>uinteger / 0x4662</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileUsedEndTime</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileUsedEndTime</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The timestamp at which this optimized font attachment goes out of context, e <dd>The timestamp at which this optimized font attachment goes out of context, e
xpressed in Segment Ticks which is based on TimestampScale. See <xref target="Di xpressed in Segment Ticks, which are based on
vXWorldFonts"></xref>.</dd> <tt>TimestampScale</tt>. See <xref target="DivXWorldFonts"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="tagdefaultbogus-element"><name>TagDefaultBogus Element</name> <section anchor="tagdefaultbogus-element"><name>TagDefaultBogus Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x44B4</dd> <dd>uinteger / 0x44B4</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\+SimpleTag\TagDefaultBogus</tt></dd> <dd><tt>\Segment\Tags\Tag\+SimpleTag\TagDefaultBogus</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>A variant of the TagDefault element with a bogus Element ID; see <xref targe t="tagdefault-element"></xref>.</dd> <dd>A variant of the <tt>TagDefault</tt> element with a bogus Element ID; see <x ref target="tagdefault-element"></xref>.</dd>
</dl> </dl>
</section> </section>
</section> </section>
</back>
</middle> <!-- [rfced] Formatting with <tt>
<back> a) Sometimes the word "element" is included in the <tt> tags and sometimes it
<references><name>Normative References</name> appears outside the tags. For example, we see both of the following in the xml:
<reference anchor="BCP47" target="https://www.rfc-editor.org/info/rfc5646">
<front>
<title>Tags for Identifying Languages</title>
<author fullname="A. Phillips" initials="A." surname="Phillips" role="editor
">
<organization></organization>
</author>
<author fullname="M. Davis" initials="M." surname="Davis" role="editor">
<organization></organization>
</author>
<date year="2009" month="September"></date>
</front>
<seriesInfo name="BCP" value="47"></seriesInfo>
<seriesInfo name="RFC" value="5646"></seriesInfo>
<seriesInfo name="DOI" value="10.17487/RFC5646"></seriesInfo>
</reference>
<reference anchor="CIE-1931" target="https://en.wikipedia.org/wiki/CIE_1931_colo
r_space">
<front>
<title>CIE 1931 Standard Colorimetric System</title>
<author>
<organization>Commission Internationale de l&#39;Eclairage</organization>
</author>
<date year="1931"></date>
</front>
</reference>
<reference anchor="ISO639-2" target="https://www.loc.gov/standards/iso639-2/php/
code_list.php">
<front>
<title>Codes for the Representation of Names of Languages</title>
<author>
<organization>United States Library Of Congress</organization>
</author>
<date year="2017" month="December" day="21"></date>
</front>
<seriesInfo name="ISO" value="639-2:1998"></seriesInfo>
</reference>
<reference anchor="ISO9899" target="https://www.iso.org/standard/57853.html">
<front>
<title>Information technology -- Programming languages -- C</title>
<author>
<organization>International Organization for Standardization</organization
>
</author>
<date year="2011"></date>
</front>
<seriesInfo name="ISO/IEC" value="9899:2011"></seriesInfo>
</reference>
<reference anchor="ITU-H.273" target="https://www.itu.int/rec/T-REC-H.273/en">
<front>
<title>Coding-independent code points for video signal type identification</
title>
<author>
<organization>International Telecommunication Union</organization>
</author>
<date year="2021" month="September" day="24"></date>
</front>
<seriesInfo name="ITU" value="H.273"></seriesInfo>
</reference>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.1950.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.2119.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.4122.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.6838.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8081.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8126.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8174.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8794.
xml"/>
</references>
<references><name>Informative References</name>
<reference anchor="AVIFormat" target="https://docs.microsoft.com/en-us/windows/w
in32/directshow/avi-riff-file-reference">
<front>
<title>AVI RIFF File Reference</title>
<author>
<organization>Microsoft</organization>
</author>
<date year="2018" month="May" day="31"></date>
</front>
</reference>
<reference anchor="BZIP2" target="https://sourceware.org/bzip2/">
<front>
<title>bzip2</title>
<author fullname="Julian Seward" initials="J." surname="Seward">
<organization></organization>
</author>
<date year="1996" month="July" day="18"></date>
</front>
</reference>
<reference anchor="Blowfish" target="https://www.schneier.com/academic/blowfish/
">
<front>
<title>The Blowfish Encryption Algorithm</title>
<author fullname="Bruce Schneier" initials="B." surname="Schneier">
<organization></organization>
</author>
<date year="1993"></date>
</front>
</reference>
<reference anchor="DVD-Video" target="http://www.dvdforum.org/">
<front>
<title>DVD-Books: Part 3 DVD-Video Book</title>
<author>
<organization>DVD Forum</organization>
</author>
<date year="1995" month="November" day="1"></date>
</front>
</reference>
<reference anchor="DivXTrickTrack" target="https://web.archive.org/web/201012220
01148/http://labs.divx.com/node/16601">
<front>
<title>DivX Trick Track Extensions</title>
<author></author>
<date year="2010" month="December" day="14"></date>
</front>
</reference>
<reference anchor="DivXWorldFonts" target="https://web.archive.org/web/201102141
32246/http://labs.divx.com/node/16602">
<front>
<title>DivX World Fonts Extensions</title>
<author></author>
<date year="2010" month="December" day="14"></date>
</front>
</reference>
<reference anchor="FIPS.197" target="https://csrc.nist.gov/publications/detail/f
ips/197/final">
<front>
<title>Advanced Encryption Standard (AES)</title>
<author>
<organization>US National Institute of Standards and Technology</organizat
ion>
</author>
<date year="2001" month="November" day="26"></date>
</front>
<seriesInfo name="FIPS" value="PUB 197"></seriesInfo>
<seriesInfo name="DOI" value="10.6028/NIST.FIPS.197"></seriesInfo>
</reference>
<reference anchor="FIPS.46-3" target="https://csrc.nist.gov/publications/detail/
fips/46/3/archive/1999-10-25">
<front>
<title>Data Encryption Standard (DES)</title>
<author>
<organization>US National Institute of Standards and Technology</organizat
ion>
</author>
<date year="1999" month="October" day="25"></date>
</front>
<seriesInfo name="FIPS" value="PUB 46"></seriesInfo>
</reference>
<reference anchor="FourCC-RGB" target="https://web.archive.org/web/2016060921480
6/https://www.fourcc.org/rgb.php">
<front>
<title>RGB Pixel Format FourCCs</title>
<author>
<organization>Silicon.dk ApS</organization>
</author>
</front>
</reference>
<reference anchor="FourCC-YUV" target="https://web.archive.org/web/2016060921480
6/https://www.fourcc.org/yuv.php">
<front>
<title>YUV Pixel Format FourCCs</title>
<author>
<organization>Silicon.dk ApS</organization>
</author>
</front>
</reference>
<reference anchor="JPEG" target="https://www.w3.org/Graphics/JPEG/itu-t81.pdf">
<front>
<title>Digital Compression and Coding of Continuous-Tone Still Images</title
>
<author>
<organization>International Telegraph and Telephone Consultative Committee
</organization>
</author>
<date year="1992" month="September"></date>
</front>
<seriesInfo name="ITU" value="T.81"></seriesInfo>
</reference>
<reference anchor="LZO" target="https://www.kernel.org/doc/Documentation/lzo.txt
">
<front>
<title>Lempel-Ziv-Oberhumer compression</title>
<author fullname="Willy Tarreau" initials="W." surname="Tarreau">
<organization></organization>
</author>
<author fullname="Dave Rodgman" initials="R." surname="Rodgman">
<organization></organization>
</author>
<author fullname="Markus Oberhumer" initials="M." surname="Oberhumer">
<organization></organization>
</author>
<date year="2018" month="October" day="30"></date>
</front>
</reference>
<reference anchor="MCF" target="http://mukoli.free.fr/mcf/">
<front>
<title>Media Container Format</title>
<author></author>
<date year="2002" month="July" day="17"></date>
</front>
</reference>
<reference anchor="MSRGB" target="https://learn.microsoft.com/en-us/openspecs/wi
ndows_protocols/ms-wmf/4e588f70-bd92-4a6f-b77f-35d0feaf7a57">
<front>
<title>WMF Compression Enumeration</title>
<author>
<organization>Microsoft</organization>
</author>
</front>
</reference>
<reference anchor="MSYUV16" target="https://learn.microsoft.com/en-us/windows/wi
n32/medfound/10-bit-and-16-bit-yuv-video-formats">
<front>
<title>10-bit and 16-bit YUV Video Formats</title>
<author>
<organization>Microsoft</organization>
</author>
</front>
</reference>
<reference anchor="MSYUV8" target="https://learn.microsoft.com/en-us/windows/win
32/medfound/recommended-8-bit-yuv-formats-for-video-rendering">
<front>
<title>Recommended 8-Bit YUV Formats for Video Rendering</title>
<author>
<organization>Microsoft</organization>
</author>
</front>
</reference>
<reference anchor="MatroskaCodec" target="">
<front>
<title>Media Container Codec Specifications</title>
<author fullname="Steve Lhomme" initials="S." surname="Lhomme"></author>
<author fullname="Moritz Bunkus" initials="M." surname="Bunkus"></author>
<author fullname="Dave Rice" initials="D." surname="Rice"></author>
<date year="2021" month="April" day="12"></date>
</front>
<seriesInfo name="Internet-Draft" value="draft-ietf-cellar-codec-10"></seriesI
nfo>
</reference>
<reference anchor="MatroskaTags" target="">
<front>
<title>Matroska Media Container Tag Specifications</title>
<author fullname="Steve Lhomme" initials="S." surname="Lhomme"></author>
<author fullname="Moritz Bunkus" initials="M." surname="Bunkus"></author>
<author fullname="Dave Rice" initials="D." surname="Rice"></author>
<date year="2021" month="April" day="12"></date>
</front>
<seriesInfo name="Internet-Draft" value="draft-ietf-cellar-tags-10"></seriesIn
fo>
</reference>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.0959.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.2083.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.3533.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.9110.
xml"/>
<reference anchor="SMB-CIFS" target="https://winprotocoldoc.blob.core.windows.ne
t/productionwindowsarchives/MS-CIFS/%5bMS-CIFS%5d.pdf">
<front>
<title>Common Internet File System (CIFS) Protocol</title>
<author>
<organization>Microsoft Corporation</organization>
</author>
<date year="2020" month="October" day="1"></date>
</front>
</reference>
<reference anchor="SP.800-38A" target="https://csrc.nist.gov/publications/detail
/fips/197/final">
<front>
<title>Recommendation for Block Cipher Modes of Operation: Methods and Techn
iques</title>
<author>
<organization>US National Institute of Standards and Technology</organizat
ion>
</author>
<date year="2001" month="December" day="01"></date>
</front>
<seriesInfo name="DOI" value="10.6028/NIST.SP.800-38A"></seriesInfo>
</reference>
<reference anchor="SP.800-67" target="https://csrc.nist.gov/publications/detail/
sp/800-67/rev-2/final">
<front>
<title>Recommendation for the Triple Data Encryption Algorithm (TDEA) Block
Cipher</title>
<author>
<organization>US National Institute of Standards and Technology</organizat
ion>
</author>
<date year="2017" month="November" day="01"></date>
</front>
<seriesInfo name="DOI" value="10.6028/10.6028/NIST.SP.800-67r2"></seriesInfo>
</reference>
<reference anchor="Twofish" target="https://www.schneier.com/academic/twofish/">
<front>
<title>Twofish: A 128-Bit Block Cipher</title>
<author fullname="Bruce Schneier" initials="B." surname="Schneier">
<organization></organization>
</author>
<author fullname="John Kelsey" initials="J." surname="Kelsey">
<organization></organization>
</author>
<author fullname="Doug Whiting" initials="D." surname="Whiting">
<organization></organization>
</author>
<author fullname="David Wagner" initials="D." surname="Wagner">
<organization></organization>
</author>
<author fullname="Chris Hall" initials="C." surname="Hall">
<organization></organization>
</author>
<author fullname="Niels Ferguson" initials="N." surname="Ferguson">
<organization></organization>
</author>
<date year="1998" month="June" day="15"></date>
</front>
</reference>
<reference anchor="WebM-Enc" target="https://www.webmproject.org/docs/webm-encry
ption/">
<front>
<title>WebM Encryption</title>
<author fullname="Frank Galligan">
<organization>Google</organization>
</author>
<date year="2016" month="September" day="19"></date>
</front>
</reference>
<reference anchor="WebVTT" target="https://www.w3.org/TR/webvtt1/#webvtt-cue-ide
ntifier">
<front>
<title>WebVTT Cue Identifier</title>
<author fullname="Simon Pieters">
<organization>Opera Software AS</organization>
</author>
<author fullname="Silvia Pfeiffer" role="editor">
<organization>NICTA</organization>
</author>
<author fullname="Philip Jaegenstedt">
<organization>Opera Software ASA</organization>
</author>
<author fullname="Ian Hickson">
<organization>Google</organization>
</author>
<date year="2019" month="April" day="4"></date>
</front>
</reference>
</references>
</back> <tt>SimpleBlock Element</tt>
<tt>SimpleBlock</tt> Element
We suggest making such terms consistent. Should "Element" appear in <tt>
tagging, or should it appear outside the tags?
-->
<!-- [cellar] Indeed, it has been a struggle to pick one.
We should probably not put Element in the <tt> code so only the actual element n
ame is highlighted.
Would you like us to submit a new version with all those changed ?
-->
<!-- [rfced]
b) The following terms appear both with and without <tt> in the xml. Please
review and let us know if the tagging should be consistent.
Attachment
Attachments
Block
BlockAdditions
BlockDuration
BlockGroup
ChapProcessCodecID
ChapProcessData
ChapProcessPrivate
Chapter
ChapterAtom
Chapters
ChapterSegmentEditionUID
ChapterSegmentUUID
ChapterTranslate
ChapterUID
Cluster
Clusters
CodecID
Cues
DiscardPadding
Edition
EditionEntry
Editions
Element
FileName
Matroska
NextUUID
PrevUUID
SeekHead
Segment
Segments
SegmentUUID
SimpleBlock
Tag
Tags
TagString
Timestamp
TimestampScale
Track
TrackNumber
Tracks
TrackTranslate
-->
<!-- [cellar] words that are element names should be in <tt>. If they start with
an uppercase
it's a good sign they are elements (or lowercase that they are not). A link to t
heir
definition might even be better, but it's going to make the text a little bloate
d. -->
<!-- [rfced]
f) We see the following forms used in the document. We believe that the
capitalized form indicates the element (even when not followed by the word
"Element"), while the lowercase is for general use. Please review that this
usage is consistent.
Tag vs. tag
Tags vs. tags
Example general use:
When tags from the previous layout
Examples of capped form not followed by "Element":
...has its UID listed in the Tags.
The Tags contain all extra information
-->
<!-- [cellar] Correct, except there is no Tag element, so if it's used as a capi
tal it's wrong. -->
<!-- [rfced]
g) We note that the following terms are used inconsistently throughout the
document. Please review and let us know if any updates are needed for consistenc
y.
segment vs. Segment
alpha vs. Alpha
Note: In context of "Alpha data" and "alpha channel data".
EBML header vs. EBML Header
block element vs. Block Element
block header vs. Block header vs. Block Header
Note: We will make capitalization of "header" in "SimpleBlock header" consiste
nt
with the decision here.
block vs. Block
Note: In general text, e.g., "of the virtual block" and "contained in the Bloc
k".
chapter codec vs. Chapter Codec
chapter edition(s) vs. Chapter Edition(s)
child element vs. Child Element
codec ID vs. Codec ID
Note: We will not change "CodecID" used in element names.
codec state vs. Codec State
filename vs. file name
Note: We are asking about instances aside from "FileName Element".
linked Segment vs. Linked Segment
track name vs. Track Name
Track vs. track
Note: In general text, e.g., "For separate tracks" and "end of a Track")
segment vs. Segment
cluster vs. Cluster
Stereo-3D vs. stereo 3D
edition vs. Edition
Control Track vs. control track
-->
<!-- [rfced] Capitalization of "element"
a) We note that capitalization of "element" is inconsistent when following the n
ame
of elements. Please review and let us know if any updates are needed for
consistency.
Some examples:
Capitalized:
Root Element
Top-Level Element
Empty Element
Segment Element
Info Element
SeekHead Element
Chapters Element
Cluster Element
Lowercase:
DiscardPadding element
NextFilename element
TagDefault element
TrackEntry\Name element
AttachmentLink element
Mixed capitalization:
CRC-32 element vs. CRC-32 Element
ReferenceBlock element vs. ReferenceBlock Element
Chapter element vs. Chapter Element
ChapterTimeEnd element vs. ChapterTimeEnd Element
ChapterSegmentUUID element vs. ChapterSegmentUUID Element
ChapterAtom element vs. ChapterAtom Element
b) Should "element" (lowercase) vs. "Element" (uppercase) be used in general tex
t?
Some examples:
When both values exist in the file, the value found in Tags takes
precedence over the value found in original location of the element.
In that case these elements are informational only.
These Elements
allow edges of the frame that are not intended for display,
An Element which is not
stored within a Segment Element, such as the Elements of the EBML
Header, do not have a Segment Position.
The Segment Position of an Element refers to the position of the
first octet of the Element ID of that Element, measured in octets,
from the beginning of the Element Data section of the containing
Segment Element.
-->
<!-- [cellar] inside <tt> they were used to emphasize that it's the name of an e
lement
if we move it out of the <tt> it makes more sense to lowercase them. -->
</rfc> </rfc>
 End of changes. 1082 change blocks. 
2733 lines changed or deleted 3214 lines changed or added

This html diff was produced by rfcdiff 1.48.