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<!DOCTYPE html>
<html lang="en-US">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>**PROPOSED** Timed Text Working Group Charter</title>
<link rel="stylesheet" href="https://www.w3.org/2005/10/w3cdoc.css" type="text/css" media="screen">
<link rel="stylesheet" type="text/css" href="https://www.w3.org/Guide/pubrules-style.css">
<link rel="stylesheet" type="text/css" href="https://www.w3.org/2006/02/charter-style.css">
<style type="text/css">
ul#navbar {
font-size: small;
}
dt.spec {
font-weight: bold;
}
dt.spec new {
background: yellow;
}
ul.out-of-scope > li {
font-weight: bold;
}
ul.out-of-scope > li > ul > li{
font-weight: normal;
}
.issue {
background: cornsilk;
font-style: italic;
}
.todo {
color: #900;
}
footer {
font-size: small;
}
.note {
background-color: #FAFAD2;
}
.note::before {
content: "NOTE: ";
}
</style>
</head>
<body>
<header id="header">
<aside>
<ul id="navbar">
<li>
<a href="#scope">Scope</a>
</li>
<li>
<a href="#deliverables">Deliverables</a>
</li>
<li>
<a href="#success">Success Criteria</a>
</li>
<li>
<a href="#coordination">Coordination</a>
</li>
<li>
<a href="#participation">Participation</a>
</li>
<li>
<a href="#communication">Communication</a>
</li>
<li>
<a href="#decisions">Decision Policy</a>
</li>
<li>
<a href="#patentpolicy">Patent Policy</a>
</li>
<li>
<a href="#licensing">Licensing</a>
</li>
<li>
<a href="#about">About this Charter</a>
</li>
</ul>
</aside>
<p><a href="https://www.w3.org/"><img alt="W3C" src="https://www.w3.org/Icons/w3c_home" height="48" width="72"></a>
</p>
</header>
<main>
<h1 id="title">**PROPOSED** Timed Text Working Group Charter</h1>
<p class="mission">The <strong>mission</strong> of the <a href="https://www.w3.org/AudioVideo/TT/">Timed Text
Working Group</a> is to develop W3C Recommendations for the representation of timed text in media, including
developing and maintaining new versions of the <a href="https://www.w3.org/TR/ttml/">Timed Text Markup Language</a> (TTML) and <a href="https://www.w3.org/TR/webvtt/">WebVTT</a> (Web Video Text Tracks)
based on implementation experience and interoperability feedback, and the creation of semantic mappings between
those languages.</p>
<div class="noprint">
<p class="join"><a href="https://www.w3.org/2004/01/pp-impl/34314/join">Join the Timed Text Working
Group</a>.<a href="https://www.w3.org/2004/01/pp-impl/#####/join"></a></p>
</div>
<section id="details">
<table class="summary-table">
<tbody>
<tr id="Duration">
<th>Start date</th>
<td>28 November 2019</td>
</tr>
<tr id="Duration">
<th>End date</th>
<td>31 December 2021</td>
</tr>
<tr>
<th>Charter extension</th>
<td>
See <a href="#history">Change History</a>.
</td>
</tr>
<tr>
<th>Chairs</th>
<td>Nigel Megitt (BBC),<br>
Gary Katsevman (Brightcove)</td>
</tr>
<tr>
<th>Team Contacts</th>
<td>
<a href="mailto:atsushi@w3.org">Atsushi Shimono</a> <i>(0.2 <abbr title=
"Full-Time Equivalent">FTE</abbr>)</i>
</td>
</tr>
<tr>
<th>Meeting Schedule</th>
<td><strong>Teleconferences:</strong>Usually once per week.<br>
<strong>Face-to-face:</strong> Usually no more than twice per year, including once during the W3C's annual
Technical Plenary week.</td>
</tr>
</tbody>
</table>
</section>
<section id="scope" class="scope">
<h2>Scope</h2>
<p>This group is chartered to develop specifications for the representation of timed text in media.</p>
<p>Timed text means text synchronized with other timed media, e.g. audio and video (2D, 3D, 360º, AR and VR), and
includes captions, subtitles, described video (aka video/audio description), karaoke lyrics, etc.</p>
<p>These specifications are intended to be used across the workflow from authoring to end-user presentation, and for both prepared
and live applications.</p>
<section id="success">
<div>
<h3>Success Criteria</h3>
<p>In order to advance to <a href="https://www.w3.org/Consortium/Process/#RecsPR" title=
"Proposed Recommendation">Proposed Recommendation</a>, each Recommendation-track Technical Report SHOULD have
<a href="https://www.w3.org/Consortium/Process/#implementation-experience">at least two independent
implementations</a> of each feature defined in the Technical Report.</p>
<p>Each Recommendation-track Technical Report:</p>
<ul>
<li>SHOULD contain a section detailing all known security and privacy implications for implementers, Web
authors, and end users.</li>
<li>SHOULD have an associated testing plan, starting from the earliest drafts.</li>
<li>SHOULD contain a section on accessibility that describes the benefits and impacts, including ways that
features defined in the Technical Report can be used to address them, and recommendations for maximising
accessibility in implementations.</li>
<li>SHOULD address the <a href="https://www.w3.org/TR/media-accessibility-reqs/">Media Accessibility User
Requirements</a>
</li>
<li>SHOULD contain a section discussing interoperability with previous versions, if any, of the Technical
Report, and other relevant specifications.</li>
</ul>
<p>To promote interoperability, all normative changes made to Technical Reports SHOULD have associated
<a href='https://www.w3.org/2019/02/testing-policy.html'>tests</a>.</p>
</div>
</section>
</section>
<section id="deliverables">
<h2>Deliverables</h2>
<p>More detailed milestones and updated publication schedules are available on the <a href=
"https://www.w3.org/wiki/TimedText/Publications">group publication status page</a>.</p>
<p><i>Draft state</i> indicates the state of the deliverable at the time of the charter approval. <i>Expected
completion</i> indicates when the deliverable is projected to become a Recommendation, or otherwise reach a
stable state.</p>
<div id="normative">
<h3>New Technical Reports</h3>
<p>The Working Group intends to develop the following Technical Reports:</p>
<dl>
<dt class="spec">
<a href="https://www.w3.org/TR/ttml3/">Timed Text Markup Language 3 (TTML3)</a>
</dt>
<dd>
<p>This specification defines a content type that represents timed text media for the purpose of
interchange among authoring, distribution and playback systems. Timed text is textual information that is
intrinsically or extrinsically associated with timing information.</p>
</dd>
<dt id="webvtt" class="spec">
<a href="https://www.w3.org/TR/webvtt1/">WebVTT: The Web Video Text Tracks Format</a>
</dt>
<dd>
<p>This specification defines WebVTT, the Web Video Text Tracks format. Its main use is for marking up
external text track resources in connection with the HTML <track> element. WebVTT files provide
captions or subtitles for video content, and also text video descriptions <a href=
"http://www.w3.org/TR/media-accessibility-reqs/">[MAUR]</a>, chapters for content navigation,
and more generally any form of metadata that is time-aligned with audio or video content.</p>
</dd>
<dt id="adpt" class="spec">TTML Profile for Audio Description</dt>
<dd>
<p>This specification defines a profile of [ <cite><a class="bibref" href=
"https://www.w3.org/TR/ttml2/">TTML2</a></cite> ] intended to support audio description script exchange
throughout the workflow including production of the script, rendering as voice by recording or text to
speech synthesis, and audio mixing.</p>
</dd>
</dl>
<p>The Working Group MAY develop additional Recommendation-track and non-Recommendation-track Technical
Reports.</p>
</div>
<div id="revisions">
<h3>Existing Technical Reports</h3>
<p>The Working Group MAY update its <a href="https://www.w3.org/wiki/TimedText/Publications">previously
published Technical Reports</a>.</p>
</div>
<div id="ig-other-deliverables">
<h3>Other deliverables</h3>
<p>The Working Group MAY create documents that are not Technical Reports, including:</p>
<ul>
<li>Use case and requirement documents</li>
<li>Test suite and implementation reports</li>
<li>Primer or Best Practice documents to support web developers</li>
</ul>
</div>
</section>
<section id="coordination">
<h2>Coordination</h2>
<div>
<h3 id="w3c-coordination">W3C Groups</h3>
<p>For all specifications, this Working Group will seek <a href="https://www.w3.org/Guide/process/charter.html#horizontal-review">horizontal review</a> for
accessibility, internationalization, performance, privacy, and security with the relevant Working and
Interest Groups, and with the <a href="https://www.w3.org/2001/tag/" title="Technical Architecture Group">TAG</a>.
Invitation for review must be issued during each major standards-track document transition, including
<a href="https://www.w3.org/Consortium/Process/#RecsWD" title="First Public Working Draft">FPWD</a>. The
Working Group is encouraged to engage collaboratively with the horizontal review groups throughout development of
each specification. The Working Group is advised to seek a review at least 3 months before first entering
<a href="https://www.w3.org/Consortium/Process/#RecsCR" title="Candidate Recommendation">CR</a> and is encouraged
to proactively notify the horizontal review groups when major changes occur in a specification following a review.</p>
<dl>
<dt>
<a href="https://www.w3.org/WAI/APA/">Accessible Platform Architectures (APA) Working Group</a>
</dt>
<dd>The mission of the Accessible Platform Architectures Working Group (APA WG) is to ensure W3C
specifications provide support for accessibility to people with disabilities.</dd>
<dt>
<a href="https://www.w3.org/community/audio-description/">Audio Description Community Group</a>
</dt>
<dd>This group developed the first Community report for the Audio Description Profile of TTML2.</dd>
<dt>
<a href="https://www.w3.org/Style/CSS/">CSS Working Group</a>
</dt>
<dd>The work of the Working Group coordinates with this group on presentation and layout issues.</dd>
<dt>
<a href="https://www.w3.org/2011/webtv/">Media and Entertainment Interest Group</a>
</dt>
<dd>The Media and Entertainment Interest Group provides a forum for Web and TV technical discussions, review
existing work, as well as the relationship between services on the Web and TV services, and identifies
requirements and potential solutions to ensure that the Web will function well with TV.</dd>
<dt>
<a href="https://www.w3.org/community/texttracks/">Web Media Text Tracks Community Group</a>
</dt>
<dd>This group developed the first Community report for the WebVTT format and will continue to explore new
features.</dd>
<dt>
<a href="https://www.w3.org/community/immersive-web/">Immersive Web Community Group</a>
</dt>
<dd>This group is to help bring high-performance Virtual Reality and Augmented Reality to the open Web.</dd>
<dt>
<a href="https://www.w3.org/WebPlatform/WG/">Web Platform Working Group</a>
</dt>
<dd>The HTML specification is intended to provide a semantic-level markup language and associated
semantic-level scripting APIs for authoring accessible pages on the Web ranging from static documents to
dynamic applications. It includes media elements to present video, audio and video text tracks and their
associated APIs.</dd>
<dd>
</dd>
<dt>
<a href="https://www.w3.org/2001/tag/" title="Technical Architecture Group">TAG</a>
</dt>
<dd>
</dd>
</dl>
<p>Invitation for review SHALL be issued during each major Recommendation-track document transition, including
<a href="https://www.w3.org/Consortium/Process/#RecsWD" title="First Public Working Draft">FPWD</a>, and when
major changes occur in a specification, and SHOULD be issued at least 3 months before <a href=
"https://www.w3.org/Consortium/Process/#RecsCR" title="Candidate Recommendation">CR</a>.</p>
<h3 id="external-coordination">External Organizations</h3>
<p>The Working Group SHOULD, whenever possible, seek interoperability with other timed text formats, API, and
applications.</p>
<p>As such, the Working Group SHOULD seek review with the following external organizations.</p>
<dl>
<dt>
<a href="https://www.iso.org/committee/45316.html">ISO/IEC JTC-1/SC-29 WG 11 Moving Picture Experts Group
(MPEG)</a>
</dt>
<dd>This group is developing standards for coded representation of digital audio and video, including
MPEG-4.</dd>
<dt>
<a href="https://www.smpte.org/">Society of Motion Picture and Television Engineers (SMPTE)</a>
</dt>
<dd>This organization was founded to advance theory and development in the motion imaging field. SMPTE
produced extensions to TTML1 that are part of SMPTE-TT.</dd>
<dt>
<a href="https://www.ebu.ch/home">European Broadcasting Union (EBU)</a>
</dt>
<dd>The EBU is an association of national broadcasting organizations, facilitating the exchange of
audiovisual content. The EBU has developed EBU-TT, an XML-based format for use in subtitling production and
exchange, and EBU-TT-D for use in subtitle distribution, both of which are constrained and extended variants
of TTML1.</dd>
<dt>
<a href="https://www.dvb.org/groups/TM">DVB Project: Technical Module (DVB-TM)</a>
</dt>
<dd>The DVB Project develops specifications for digital television systems, which are turned into standards
by international standards bodies such as ETSI or CENELEC. It provides a conduit to other relevant
standardisation activities including MPEG for the purpose of meeting the objectives of the DVB Project.</dd>
<dt>
<a href="https://www.atsc.org/">Advanced Television Systems Committee (ATSC)</a>
</dt>
<dd>ATSC develops standards for digital television and depends on external standards for digital closed
captioning.</dd>
<dt>
<a href="https://www.3gpp.org/specifications-groups/sa-plenary/sa4-codec">3GPP SA4</a>
</dt>
<dd>SA WG4 Codec deals with the specifications for speech, audio, video, and multimedia codecs, in both circuit-switched and packet-switched environments.</dd>
</dl>
</div>
</section>
<section class="participation">
<h2 id="participation">Participation</h2>
<p>To be successful, the Working Group is expected to have 6 or more active participants for its duration,
including representatives from the key implementors of this specification, and active Editors and Test Leads for
each specification. The Chairs and specification Editors are expected to contribute half of a working day per
week towards the Working Group. There is no minimum requirement for other Participants.</p>
<p>The Working Group encourages questions, comments and issues on its public mailing lists and document
repositories, as described in <a href="#communication">Communication</a>.</p>
<p>The Working Group also welcomes non-Members to contribute technical submissions for consideration upon their
agreement to the terms of the <a href="https://www.w3.org/Consortium/Patent-Policy/">W3C Patent Policy</a>.</p>
</section>
<section id="communication">
<h2>Communication</h2>
<p id="public">Technical discussions for this Working Group are conducted in <a href=
"https://www.w3.org/Consortium/Process/#confidentiality-levels">public</a>: the meeting minutes from
teleconference and face-to-face meetings will be archived for public review, and technical discussions and issue
tracking will be conducted in a manner that can be both read and written to by the general public. Working Drafts
and Editor's Drafts of specifications will be developed on a public repository, and MAY permit direct public
contribution requests. The meetings themselves are not open to public participation, however.</p>
<p>Information about the Working Group (including details about deliverables, issues, actions, status,
participants, and meetings) will be available from the <a href="https://www.w3.org/AudioVideo/TT/">Timed Text
Working Group home page</a>.</p>
<p>Most <a href="https://www.w3.org/AudioVideo/TT/">Timed Text Working Group</a> teleconferences will focus on
discussion of particular specifications, and will be conducted on an as-needed basis.</p>
<p>This Working Group primarily conducts its technical work on the public mailing list public-tt@w3.org (<a href=
"http://lists.w3.org/Archives/Public/public-tt/">archive</a>) or <a id="public-github" href=
"https://github.com/w3c/">GitHub issues</a>. The public is invited to review, discuss and contribute to this
work.</p>
<p>The Working Group MAY use a Member-confidential mailing list member-tt@w3.org (<a href=
"http://lists.w3.org/Archives/Member/member-tt/">archive</a>) for administrative purposes and, at the discretion
of the Chairs and members of the group, for member-only discussions in special cases when a participant requests
such a discussion.</p>
</section>
<section id="decisions">
<h2>Decision Policy</h2>
<p>This Working Group will seek to make decisions through consensus and due process, per the <a href=
"https://www.w3.org/Consortium/Process/#Consensus">W3C Process Document (section 3.3</a>). Typically, an editor
or other participant makes an initial proposal, which is then refined in discussion with members of the Working
Group and other reviewers, and consensus emerges with little formal voting being required.</p>
<p>However, if a decision is necessary for timely progress, but consensus is not achieved after careful
consideration of the range of views presented, the Chairs MAY call for a Working Group vote, and record a
decision along with any objections.</p>
<p>To afford asynchronous decisions and organizational deliberation, any resolution (including publication
decisions) taken in a face-to-face meeting or teleconference will be considered provisional. A call for consensus
(CfC) will be issued for all resolutions (for example, via email and/or web-based survey), with a response period
of 10 working days. If no objections are raised on the mailing list by the end of the response period, the
resolution will be considered to have consensus as a resolution of the Working Group.</p>
<p>All decisions made by the Working Group SHOULD be considered resolved unless and until new information becomes
available, or unless reopened at the discretion of the Chairs or the Director.</p>
<p>This charter is written in accordance with the <a href="https://www.w3.org/Consortium/Process/#Votes">W3C
Process Document (Section 3.4, Votes)</a>, and includes no voting procedures beyond what the Process Document
requires.</p>
</section>
<section id="patentpolicy">
<h2>Patent Policy</h2>
<p>This Working Group operates under the <a href="https://www.w3.org/Consortium/Patent-Policy/">W3C Patent
Policy</a> (Version of 5 February 2004 updated 1 August 2017). To promote the widest adoption of Web standards,
W3C seeks to issue Recommendations that can be implemented, according to this policy, on a Royalty-Free basis.
For more information about disclosure obligations for this group, please see the <a href=
"https://www.w3.org/2004/01/pp-impl/">W3C Patent Policy Implementation</a>.</p>
</section>
<section id="licensing">
<h2>Licensing</h2>
<p>For each deliverable the Working Group MAY choose either the <a href=
"https://www.w3.org/Consortium/Legal/copyright-documents">W3C Document license</a> or the <a href=
"https://www.w3.org/Consortium/Legal/copyright-software">W3C Software and Document license</a>.</p>
</section>
<section id="about">
<h2>About this Charter</h2>
<p>This charter has been created according to <a href="https://www.w3.org/Consortium/Process/#GAGeneral">section
5.2</a> of the <a href="https://www.w3.org/Consortium/Process">Process Document</a>. In the event of a conflict
between this document or the provisions of any charter and the W3C Process, the W3C Process SHALL take
precedence.</p>
<section id="history">
<h3>Charter History</h3>
<p>The following table lists details of all changes from the initial charter, per the <a href=
"https://www.w3.org/Consortium/Process/#CharterReview">W3C Process Document (section 5.2.3)</a>:</p>
<table class="history">
<tbody>
<tr>
<th>Charter Period</th>
<th>Start Date</th>
<th>End Date</th>
<th>Changes</th>
</tr>
<tr>
<th>
<a href="http://www.w3.org/2008/01/timed-text-wg">Initial Charter</a>
</th>
<td>2008-08-15</td>
<td>2010-06-30</td>
<td>Restarted the Working Group</td>
</tr>
<tr>
<th>
<a href="https://lists.w3.org/Archives/Member/w3c-ac-members/2011JanMar/0026.html">Charter
Extension</a>
</th>
<td>
</td>
<td>2011-03-31</td>
<td>none</td>
</tr>
<tr>
<th>
<a href="http://www.w3.org/2012/07/ttml-charter.html">Rechartered</a>
</th>
<td>2012-07-25</td>
<td>2014-01-31</td>
<td>TTML 1.0 2nd edition, TTML 1.1</td>
</tr>
<tr>
<th>
<a href="http://www.w3.org/2014/03/timed-text-charter.html">Rechartered</a>
</th>
<td>2014-03-27</td>
<td>2016-03-30</td>
<td>WebVTT 1.0, IMSC 1.0</td>
</tr>
<tr>
<th>
<a href="https://lists.w3.org/Archives/Member/w3c-ac-members/2016AprJun/0008.html">Charter
Extension</a>
</th>
<td>
</td>
<td>2016-05-31</td>
<td>none</td>
</tr>
<tr>
<th>
<a href="https://www.w3.org/2016/05/timed-text-charter.html">Rechartered</a>
</th>
<td>2016-05-19</td>
<td>2018-03-31</td>
<td>none</td>
</tr>
<tr>
<th>
<a href="https://lists.w3.org/Archives/Member/w3c-ac-members/2018AprJun/0004.html">Charter
Extension</a>
</th>
<td>
</td>
<td>2018-05-31</td>
<td>none</td>
</tr>
<tr>
<th>
<a href="https://www.w3.org/2018/05/timed-text-charter.html">Rechartered</a>
</th>
<td>2018-05-30</td>
<td>2020-05-31</td>
<td>none</td>
</tr>
<tr>
<th>
<a href="">Proposed</a>
</th>
<td>2019-0?-01</td>
<td>2021-0?-31</td>
<td><i class='todo'>@@FIXME</i>
</td>
</tr>
</tbody>
</table>
</section>
</section>
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