id,summary,reporter,owner,description,type,status,priority,component,version,resolution,keywords,cc,blockedby,blocking,reproduced,analyzed
1213,"Ogg: video time stamps start incorrectly, cannot transcode to AVI",reimar,,"I am not sure whether this is a broken file or whether the ogg demuxer fills in bogus video time stamps.
The issue here is that audio starts with huge time stamps while video starts with 0.
This was originally reported as a Debian bug because MPlayer has issues handling it: ""Bug#668543: mplayer: ogv video freezes with DRI failure"".
For FFmpeg, this results in an actually error when transcoding to AVI (though this can probably be worked around without fixing the underlying Ogg demuxer issue, please only close if the Ogg demuxer has been fixed or it is sure the file is too broken to change the Ogg demuxer to work nicely with it):
ffmpeg -i broken.ogv out.avi
ffmpeg version N-39755-g3bb9889 Copyright (c) 2000-2012 the FFmpeg developers
  built on Apr 14 2012 00:47:46 with gcc 4.6.3
  configuration: --enable-gpl
  libavutil      51. 46.100 / 51. 46.100
  libavcodec     54. 14.101 / 54. 14.101
  libavformat    54.  3.100 / 54.  3.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 67.101 /  2. 67.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 11.100 /  0. 11.100
  libpostproc    52.  0.100 / 52.  0.100
[ogg @ 0x1990080] Broken file, keyframe not correctly marked.
Input #0, ogg, from 'broken.ogv':
  Duration: 09:11:03.74, start: 0.000000, bitrate: 0 kb/s
    Stream #0:0: Data: none
    Stream #0:1: Video: theora, yuv420p, 720x480 [SAR 8:9 DAR 4:3], 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
    Stream #0:2: Audio: vorbis, 48000 Hz, stereo, s16, 224 kb/s
    Metadata:
      TITLE           : LAC 2012 - High Quality
      LOCATION        : CCRMA, Stanford University, CA, US
      ORGANIZATION    : Linux Audio Conference 2012
      LICENSE         : CC
      ENCODER         : ffmpeg2theora-0.28+svn18224M
w:720 h:480 pixfmt:yuv420p tb:1/1000000 sar:8/9 sws_param:flags=2
Incompatible sample format 's16' for codec 'ac3', auto-selecting format 'flt'
Output #0, avi, to 'out.avi':
  Metadata:
    ISFT            : Lavf54.3.100
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 720x480 [SAR 8:9 DAR 4:3], q=2-31, 200 kb/s, 29.97 tbn, 29.97 tbc
    Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, flt, 192 kb/s
    Metadata:
      TITLE           : LAC 2012 - High Quality
      LOCATION        : CCRMA, Stanford University, CA, US
      ORGANIZATION    : Linux Audio Conference 2012
      LICENSE         : CC
      ENCODER         : ffmpeg2theora-0.28+svn18224M
Stream mapping:
  Stream #0:1 -> #0:0 (theora -> mpeg4)
  Stream #0:2 -> #0:1 (vorbis -> ac3)
Press [q] to stop, [?] for help
[theora @ 0x1bf87c0] vp3: first frame not a keyframe
[avi @ 0x19dcfc0] Too large number of skiped frames 1032161
av_interleaved_write_frame(): Invalid argument
",defect,closed,normal,avformat,git-master,fixed,ogg,,,,1,0