[FFmpeg-trac] #941(avformat:open): Seek problems with ogg decoder

[FFmpeg]

#941: Seek problems with ogg decoder
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             Reporter:  DonMoir     |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  ogg seek    |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
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Comment (by cehoyos):

 Sample plays fine for ~11 seconds, -ss 1 - 5 seem to work fine, 6 and 7
 behave like ticket #438, the same as for the original sample.
 {{{
 $ ffmpeg -ss 8 -i bad_seek_ogg_BuckBunny_cut.ogv out.png
 ffmpeg version N-37208-g01fcbdf Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Jan 27 2012 22:13:40 with gcc 4.5.3
   configuration: --cc=/usr/local/gcc-4.5.3/bin/gcc
   libavutil      51. 34.101 / 51. 34.101
   libavcodec     53. 60.100 / 53. 60.100
   libavformat    53. 31.100 / 53. 31.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 60.100 /  2. 60.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0.  6.100 /  0.  6.100
 [ogg @ 0x13dc3a0] read_timestamp() failed in the middle
     Last message repeated 1 times
 bad_seek_ogg_BuckBunny_cut.ogv: could not seek to position 8.000
 Input #0, ogg, from 'bad_seek_ogg_BuckBunny_cut.ogv':
   Duration: 00:00:11.87, start: 0.000000, bitrate: 689 kb/s
     Stream #0:0: Data: none
     Stream #0:1: Video: theora, yuv420p, 640x352, 24 fps, 24 tbr, 24 tbn,
 24 tbc
     Stream #0:2: Audio: vorbis, 44100 Hz, stereo, s16, 44 kb/s
 Incompatible pixel format 'yuv420p' for codec 'png', auto-selecting format
 'rgb24'
 [buffer @ 0x13dcb60] w:640 h:352 pixfmt:yuv420p tb:1/1000000 sar:0/1
 sws_param:
 [buffersink @ 0x13e0580] auto-inserting filter 'auto-inserted scale 0'
 between the filter 'src' and the filter 'out'
 [scale @ 0x13e0e60] w:640 h:352 fmt:yuv420p -> w:640 h:352 fmt:rgb24
 flags:0x4
 Output #0, image2, to 'out.png':
   Metadata:
     encoder         : Lavf53.31.100
     Stream #0:0: Video: png, rgb24, 640x352, q=2-31, 200 kb/s, 90k tbn, 24
 tbc
 Stream mapping:
   Stream #0:1 -> #0:0 (theora -> png)
 Press [q] to stop, [?] for help
 frame=    0 fps=  0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=
 0.0kbits/s
 video:0kB audio:0kB global headers:0kB muxing overhead nan%
 Output file is empty, nothing was encoded (check -ss / -t / -frames
 parameters if used)
 }}}

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/941#comment:3>
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