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isobmff-byte-stream-format-respec.html
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<!DOCTYPE html SYSTEM "about:legacy-compat">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>ISO BMFF Byte Stream Format</title>
<script src="respec-w3c-common.js" class="remove"></script>
<script src="media-source.js" class="remove"></script>
<script class="remove">
(function() {
var isobmffContainerSpecDefinitions = {
'iso-14496-12': { fragment: 'http://standards.iso.org/ittf/PubliclyAvailableStandards/c061988_ISO_IEC_14496-12_2012.zip', link_text: 'ISO/IEC 14496-12', },
'movie-fragment-relative-addressing': { fragment: '#movie-fragment-relative-addressing', link_text: 'movie-fragment relative addressing'}
};
mediaSourceAddDefinitionInfo("isobmff-byte-stream-format", "", isobmffContainerSpecDefinitions);
})();
</script>
<script class="remove">
var respecConfig = {
// specification status (e.g. WD, LCWD, NOTE, etc.). If in doubt use ED.
specStatus: "ED",
// the specification's short name, as in http://www.w3.org/TR/short-name/
shortName: "media-source", <!-- The registry does not have its own short name -->
// if there a publicly available Editor's Draft, this is the link
edDraftURI: "https://w3c.github.io/media-source/isobmff-byte-stream-format.html",
// if this is a LCWD, uncomment and set the end of its review period
// lcEnd: "2009-08-05",
//publishDate: "2015-03-09",
prevVersion: "http://www.w3.org/2013/12/byte-stream-format-registry/isobmff-byte-stream-format.html",
// editors, add as many as you like
// only "name" is required
editors: [
{ name: "Matthew Wolenetz", url: "", company: "Google Inc.", companyURL: "http://www.google.com/" },
{ name: "Jerry Smith", url: "", company: "Microsoft Corporation", companyURL: "http://www.microsoft.com/" },
{ name: "Mark Watson", url: "", company: "Netflix Inc.", companyURL: "http://www.netflix.com/" },
{ name: "Aaron Colwell (until April 2015)", url: "", company: "Google Inc.", companyURL: "http://www.google.com/" },
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// name of the WG
wg: "HTML Media Extensions Working Group",
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wgURI: "http://www.w3.org/html/wg/",
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// Empty definitions for objects declared in the document are here to
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definitionMap: {},
postProcess: [ mediaSourcePostProcessor ],
localBiblio: {
"INBANDTRACKS": {
title: "Sourcing In-band Media Resource Tracks from Media Containers into HTML",
href: "http://dev.w3.org/html5/html-sourcing-inband-tracks/",
authors: ["Bob Lund", "Silvia Pfeiffer"],
publisher: "W3C",
}
}
};
</script>
<!-- script to register bugs -->
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<script src="https://w3c.github.io/webcomponents/assets/scripts/bug-assist.js"></script>
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<meta name="bug.product" content="HTML WG">
<meta name="bug.component" content="Media Source Extensions">
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<style>
.iso-box { font-weight: bold; }
.iso-var { font-style: italic; }
</style>
</head>
<body>
<section id="abstract">
This specification defines a <a href="http://www.w3.org/TR/media-source/">Media Source Extensions</a> byte stream format specification based on the ISO Base Media
File Format.
</section>
<section id="sotd">
<p>The working group maintains <a href="https://github.com/w3c/media-source/issues">a list of all bug reports that the editors have not yet tried to address</a>; there may also be open bugs in the <a href="http://w3.org/brief/Mjcw">previous bug tracker</a>.</p>
<p>Implementors should be aware that this specification is not stable. <strong>Implementors who are not taking part in the discussions are likely to find the specification changing out from under them in incompatible ways.</strong> Vendors interested in implementing this specification before it eventually reaches the Candidate Recommendation stage should join the mailing list mentioned below and take part in the discussions.</p>
</section>
<section id="introduction">
<h2>Introduction</h2>
<p>This specification defines segment formats for implementations that choose to support the ISO Base Media File Format
<a def-id="iso-14496-12"></a> (ISO BMFF).</p> It defines the MIME-type parameters used to signal codecs, and provides
the necessary format specific definitions for <a def-id="init-segments"></a>, <a def-id="media-segments"></a>, and <a def-id="random-access-points"></a> required by
the <a def-id="byte-stream-formats-section"></a> of the Media Source Extensions spec.</p>
</section>
<section id="mime-parameters">
<h2>MIME-type parameters</h2>
<p>This section specifies the parameters that can be used in the MIME-type passed to <a def-id="isTypeSupported"></a> or <a def-id="addSourceBuffer"></a>.</p>
<p>MIME-types for this specification MUST conform to the rules outlined for "audio/mp4" and "video/mp4" in <a href="http://tools.ietf.org/html/rfc6381">RFC 6381</a>.
</p>
<div class="note">Implementations MAY only implement a subset of the codecs and profiles mentioned in the RFC.</div>
</section>
<section id="iso-init-segments">
<h4>Initialization Segments</h4>
<p>An ISO BMFF <a def-id="init-segment"></a> is defined in this specification as a single File Type Box (<span class="iso-box">ftyp</span>) followed by a single Movie Box (<span class="iso-box">moov</span>).</p>
<p>The user agent MUST run the <a def-id="append-decode-error-algorithm"></a> if any of the following conditions are met:</p>
<ol>
<li>A File Type Box contains a <span class="iso-var">major_brand</span> or <span class="iso-var">compatible_brand</span> that the user agent does not support.</li>
<li>A box or field in the Movie Box is encountered that violates the requirements mandated
by the <span class="iso-var">major_brand</span> or one of the
<span class="iso-var">compatible_brands</span> in the File Type Box.</li>
<li>The tracks in the Movie Box contain samples (i.e., the <span class="iso-var">entry_count</span> in the
<span class="iso-box">stts</span>, <span class="iso-box">stsc</span> or <span class="iso-box">stco</span> boxes are not set to zero).</li>
<li>A Movie Extends (<span class="iso-box">mvex</span>) box is not contained in the Movie (<span class="iso-box">moov</span>) box to indicate that Movie Fragments are to be expected.</li>
</ol>
<p>The user agent MUST support setting the offset from media composition time to movie presentation time by handling an Edit Box (<span class="iso-box">edts</span>) containing a single Edit List Box
(<span class="iso-box">elst</span>) that contains a single edit with media rate one. This edit MAY have a duration of 0 (indicating that it spans all subsequent media) or MAY have a non-zero duration
(indicating the total duration of the movie including fragments).</p>
<p>The user agent MUST support codec configurations stored out-of-band in the sample entry, and for codecs which allow codec configurations stored inband in the samples themselves, the user agent SHOULD support codec configurations stored inband.</p>
<p class="note">For example, for codecs which include SPS and PPS parameter sets, for maximum content interoperability, user agents are strongly advised to support both inband (e.g., as defined for avc3/avc4) and out-of-band (e.g., as defined for avc1/2) storage of the SPS and PPS.</p>
<p>Valid top-level boxes such as <span class="iso-box">pdin</span>, <span class="iso-box">free</span>, and <span class="iso-box">sidx</span> are
allowed to appear before the <span class="iso-box">moov</span> box. These boxes MUST be accepted and ignored by the user agent and are not
considered part of the <a def-id="init-segment"></a> in this specification.</p>
<p>The user agent MUST source attribute values for id, kind, label and language for <a def-id="audio-track"></a>, <a def-id="video-track"></a> and
<a def-id="text-track"></a> objects as described for MPEG-4 ISOBMFF in the in-band tracks spec [[INBANDTRACKS]].</p>
</section>
<section id="iso-media-segments">
<h4>Media Segments</h4>
<p>An ISO BMFF <a def-id="media-segment"></a> is defined in this specification as one optional
Segment Type Box (<span class="iso-box">styp</span>) followed by a single Movie Fragment Box
(<span class="iso-box">moof</span>) followed by one or more Media Data Boxes (<span class="iso-box">mdat</span>).
If the Segment Type Box is not present, the segment MUST conform to the brands listed in the
File Type Box (<span class="iso-box">ftyp</span>) in the <a def-id="init-segment"></a>.</p>
<p>Valid top-level boxes defined in <a def-id="iso-14496-12"></a> other than <span class="iso-box">ftyp</span>,
<span class="iso-box">moov</span>, <span class="iso-box">styp</span>, <span class="iso-box">moof</span>, and <span class="iso-box">mdat</span> are allowed to appear between the end of an
<a def-id="init-segment"></a> or <a def-id="media-segment"></a> and before the beginning of a new <a def-id="media-segment"></a>.
These boxes MUST be accepted and ignored by the user agent and are not considered part of the <a def-id="media-segment"></a> in this
specification.
</p>
<p>The user agent MUST run the <a def-id="append-decode-error-algorithm"></a> if any of the following conditions are met:</p>
<ol>
<li>A box or field in the Movie Fragment Box is encountered that violates the requirements mandated
by the <span class="iso-var">major_brand</span> or one of the
<span class="iso-var">compatible_brands</span> in the Segment Type Box in this
<a def-id="media-segment"></a> or the File Type Box in the <a def-id="init-segment"></a> if a
Segment Type Box is not present.</li>
<li>This <a def-id="media-segment"></a> contains a Segment Type Box that is not compatible with the
File Type Box in the <a def-id="init-segment"></a>.</li>
<li>The Movie Fragment Box does not contain at least one Track Fragment Box (<span class="iso-box">traf</span>).</li>
<li>The Movie Fragment Box does not use <a def-id="movie-fragment-relative-addressing"></a>.</li>
<li>External data references are being used.</li>
<li>At least one Track Fragment Box does not contain a Track Fragment Decode Time Box (<span class="iso-box">tfdt</span>)</li>
<li>The Media Data Boxes do not contain all the samples referenced by the Track Fragment Run Boxes (<span class="iso-box">trun</span>) of the Movie Fragment Box.</li>
<li>Inband parameter sets are not present in the appropriate samples and parameter sets are not present in the last initialization segment appended.</li>
</ol>
<p>A Movie Fragment Box uses <dfn id="movie-fragment-relative-addressing">movie-fragment relative addressing</dfn>
when the first Track Fragment Run(<span class="iso-box">trun</span>) box in each Track Fragment Box
has the <span class="iso-var">data-offset-present</span> flag set and either of the following
conditions are met:</p>
<ul>
<li>Every Track Fragment Box in a Movie Fragment Box has the <span class="iso-var">default-base-is-moof</span> flag set.
<p class="note">This implies that the <span class="iso-var">base-data-offset-present</span> flag
is not set.</p>
</li>
<li>The Movie Fragment Box contains a single Track Fragment Box and that box does not have the <span class="iso-var">base-data-offset-present</span> flag set.</li>
</ul>
</section>
<section id="iso-random-access-points">
<h4>Random Access Points</h4>
<p>A <a def-id="random-access-point"></a> as defined in this specification corresponds to a Stream Access Point of type 1 or 2 as defined in Annex I of <a def-id="iso-14496-12"></a>.</p>
</section>
<section id="conformance"></section>
<section id="acknowledgements">
<h2>Acknowledgments</h2>
The editors would like to thank <a def-id="contributors"></a> for their contributions to this specification.
</section>
</body>
</html>