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    <h3>Update</h3> <p>Looks like Apple made an IETF draft proposal, and some people are already working on segmenters:</p> <p>HTTP Live Streaming - draft-pantos-http-live-streaming-01<br> <a href="http://tools.ietf.org/id/draft-pantos-http-live-streaming-01.txt" rel="noreferrer">http://tools.ietf.org/id/draft-pantos-http-live-streaming-01.txt</a></p> <p>iPhone HTTP Streaming with FFMpeg and an Open Source Segmenter<br> <a href="http://www.ioncannon.net/programming/452/iphone-http-streaming-with-ffmpeg-and-an-open-source-segmenter/" rel="noreferrer">http://www.ioncannon.net/programming/452/iphone-http-streaming-with-ffmpeg-and-an-open-source-segmenter/</a></p> <hr> <p>Looks like the HTTP server acts simply as a dumb HTTP server. Poking around the example website provided by Akamai gives me enough info to get started with static content streaming.</p> <p><a href="http://iphone.akamai.com/" rel="noreferrer">http://iphone.akamai.com/</a></p> <p>The whitepaper ( <a href="http://www.akamai.com/dl/akamai/iphone_wp.pdf" rel="noreferrer">http://www.akamai.com/dl/akamai/iphone_wp.pdf</a> ) provides information about the transport stream encoding, so the .ts streams are straightforward.</p> <blockquote> <p>The encoder (or a separate segmenter process) will produce H.264/AAC content in a sequence of small content segments, in MPEG-2 TS format (.ts). There is also an M3U8 index file that references the segments; in the case of live content the M3U8 is continuously updated to reflect the latest content.</p> <p>H.264 Encoding should be single-pass Baseline Profile, frame re-ordering disabled. Key frames are suggested every 5 seconds, ideally an even divisor of the chosen segment length.</p> </blockquote> <p>The website provides an M3U8 file, which is simply an M3U playlist, but in the UTF-8 character encoding format.</p> <p>That file then links to an M3U8 file for each bitrate. I assume they must all have cuts at the same positions (every 2 or 10 seconds, for instance) so that switching can be seamless. It appears to be completely client driven - the client decides how to measure bandwidth and which version it's going to get.</p> <p>The contents of the main file are:</p> <pre><code>#EXTM3U #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=860000 hi/prog_index.m3u8 #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=512000 med/prog_index.m3u8 #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=160000 lo/prog_index.m3u8 </code></pre> <p>Then each of the other files are:</p> <p>hi/prog_index.m3u8</p> <pre><code>#EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:0 #EXTINF:10, fileSequence0.ts #EXTINF:10, fileSequence1.ts #EXTINF:10, fileSequence2.ts #EXTINF:10, fileSequence3.ts #EXTINF:1, fileSequence4.ts #EXT-X-ENDLIST </code></pre> <p>med/prog_index.m3u8</p> <pre><code>#EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:0 #EXTINF:10, fileSequence0.ts #EXTINF:10, fileSequence1.ts #EXTINF:10, fileSequence2.ts #EXTINF:10, fileSequence3.ts #EXTINF:1, fileSequence4.ts #EXT-X-ENDLIST </code></pre> <p>lo/prog_index.m3u8</p> <pre><code>#EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:0 #EXTINF:10, fileSequence0.ts #EXTINF:10, fileSequence1.ts #EXTINF:10, fileSequence2.ts #EXTINF:10, fileSequence3.ts #EXTINF:1, fileSequence4.ts #EXT-X-ENDLIST </code></pre> <p>This works with the HTML 5 video tag:</p> <pre><code>&lt;video width="640" height="480"&gt; &lt;source src="content1/content1.m3u8" /&gt; &lt;/video&gt; </code></pre> <p>There are still a lot of unanswered questions, but this is probably enough to get started.</p>
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