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OggTheora - Revision history
2013-05-23T00:27:00Z
Revision history for this page on the wiki
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http://wiki.xiph.org/index.php?title=OggTheora&diff=9630&oldid=prev
Conrad: /* Ogg Theora */ add info about first granulepos (answer from Ralph, on theora-dev)
2008-11-12T09:35:08Z
<p><span class="autocomment">Ogg Theora: </span> add info about first granulepos (answer from Ralph, on theora-dev)</p>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 09:35, 12 November 2008</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div> | QUAL | KFGSHIFT| PF| resv| 40-43</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div> | QUAL | KFGSHIFT| PF| resv| 40-43</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">=== Granulepos ===</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"> * What is the number of the first *real* keyframe/frame in a theora stream ? Is it 0 or 1 ?</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">The first frame of the stream (if it hasn't been trimmed) is a</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">keyframe. It is displayed between time = 0 and time = 1 * frame_rate.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">The granulepos for that frame is based on the count of frames after</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">it's been shown, which is 1, not zero. The only Ogg pages in a theora</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">stream with a 0 granulepos should be the headers.</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Ogg Mappings]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Ogg Mappings]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Theora]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Theora]]</div></td></tr>
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Conrad
http://wiki.xiph.org/index.php?title=OggTheora&diff=8965&oldid=prev
DOS386: 2 cat's
2008-05-04T09:29:21Z
<p>2 cat's</p>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 09:29, 4 May 2008</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div> | QUAL | KFGSHIFT| PF| resv| 40-43</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div> | QUAL | KFGSHIFT| PF| resv| 40-43</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</div></td></tr>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[Category:Ogg Mappings]]</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[Category:Theora]]</ins></div></td></tr>
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DOS386
http://wiki.xiph.org/index.php?title=OggTheora&diff=8271&oldid=prev
J^ at 06:49, 3 February 2008
2008-02-03T06:49:16Z
<p></p>
<p><b>New page</b></p><div>== Ogg Theora ==<br />
<br />
Default field type: BIG ENDIAN unsigned integer<br />
<br />
Field names in full caps refer to fields described in the Theora I<br />
specification. Lowercase refers to theora_info struct members from<br />
libtheora.<br />
<br />
This is the Theora header for theora-alpha3:<br />
<br />
(VMAJ=3, VMIN=2, VREV=0)<br />
<br />
0 1 2 3<br />
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| Byte<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br />
| packtype | Identifier char[6]: 'theora' | 0-3<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br />
| | VMAJ | 4-7<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br />
| VMIN | VREV | FMBW: width >> 4 | 8-11<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br />
| FMBH: height >> 4 | PICW: frame_width | 12-15<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br />
| | PICH: frame_height | 16-19<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br />
| PICX: offset_x| PICY: offset_y| FRN: fps_numerator | 20-23<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br />
| | FRD: fps_denominator | 24-27<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br />
| | PARN: aspect_numerator | 28-31<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br />
| | PARD: aspect_denominator | 32-35<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br />
| CS: colorspace| NOMBR: target_bitrate | 36-39<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br />
| QUAL | KFGSHIFT| PF| resv| 40-43<br />
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</div>
J^