<html xmlns="http://www.w3.org/1999/xhtml"><head></head><body><section><h1>仕様書</h1><refs xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:"><ul xmlns="http://www.w3.org/1999/xhtml"><li><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="9" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[9]</anchor-end> <cite xml:lang="en">RFC 6381 - The 'Codecs' and 'Profiles' Parameters for &quot;Bucket&quot; Media Types</cite>
(<time>2011-10-09 12:42:47 +09:00</time> 版)
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://tools.ietf.org/html/rfc6381">https://tools.ietf.org/html/rfc6381</anchor-external></li></ul></refs></section><section><h1>TTML の <code class="MIME" xml:lang="en">codecs</code> 引数</h1><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="4" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[4]</anchor-end> <code class="MIME" xml:lang="en">application/ttml+xml</code> も <code class="MIME" xml:lang="en">codecs</code>
<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">引数</anchor>を定義しています。やはり<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">コーデック</anchor>の識別子を指定するものですが、
若干構文が異なっています。</p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="6" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[6]</anchor-end> 必須ではありません <src xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:10:"><anchor-internal xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="5" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">&gt;&gt;5</anchor-internal></src>。</p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="7" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[7]</anchor-end> <code class="MIME" xml:lang="en">profile</code> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">引数</anchor>と用途が重なっており、可能なら
<code class="MIME" xml:lang="en">codecs</code> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">引数</anchor>を使う <src xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:10:"><anchor-internal xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="5" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">&gt;&gt;5</anchor-internal></src> こととされています。</p><refs xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:"><ul xmlns="http://www.w3.org/1999/xhtml"><li><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="5" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[5]</anchor-end> <cite xml:lang="en">TTML Media Type Definition and Profile Registry</cite> (<time>2016-05-07 03:08:58 +09:00</time>) <anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://w3c.github.io/tt-profile-registry/#mediatype">https://w3c.github.io/tt-profile-registry/#mediatype</anchor-external></li></ul></refs></section><section><h1>歴史</h1><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="8" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[8]</anchor-end> <cite xml:lang="en">RFC 4281 - The Codecs Parameter for &quot;Bucket&quot; Media Types</cite> (<time>2016-03-31 07:55:15 +09:00</time>) <anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://tools.ietf.org/html/rfc4281">https://tools.ietf.org/html/rfc4281</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="1" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[1]</anchor-end> <cite xml:lang="en">Web Applications 1.0 r5994 10202</cite>
( (<time>2011-04-13 07:13:00 +09:00</time> 版))
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://html5.org/tools/web-apps-tracker?from=5993&amp;to=5994">https://html5.org/tools/web-apps-tracker?from=5993&amp;to=5994</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="2" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[2]</anchor-end> <cite xml:lang="en">RFC 6381 - The 'Codecs' and 'Profiles' Parameters for &quot;Bucket&quot; Media Types</cite>
(<time>2011-10-09 12:42:47 +09:00</time> 版)
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://tools.ietf.org/html/rfc6381">https://tools.ietf.org/html/rfc6381</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="3" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[3]</anchor-end> <cite xml:lang="en-US">Using HTML5 audio and video - Web developer guide | MDN</cite>
( (<time>2015-01-15 06:36:15 +09:00</time> 版))
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Using_HTML5_audio_and_video">https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Using_HTML5_audio_and_video</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="10" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[10]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">CTA-5001-D</anchor></p></section></body></html>