[FFmpeg-trac] #15(avformat:new): Initial I-frame in ogg/theora file is not decoded

[FFmpeg]

#15: Initial I-frame in ogg/theora file is not decoded
----------------------+----------------------
  Reporter:  cehoyos  |      Owner:  michael
      Type:  defect   |     Status:  new
  Priority:  normal   |  Component:  avformat
   Version:  git      |   Keywords:
Blocked By:           |   Blocking:
Reproduced:  0        |   Analyzed:  0
----------------------+----------------------
 Attached sample plays fine with vlc and mplayer -demuxer ogg -vc theora,
 it shows initial artefacts with ffmpeg (and ffplay and mplayer -demuxer
 lavf -vc theora) that disappear after a few seconds.

 {{{
 ffmpeg -loglevel 99 -v 9 -i bad\ thumbnail\ from\ this\ video.ogv -an
 -qscale 2 out.avi
 FFmpeg version git-N-28581-g4fa0e24, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Mar 23 2011 06:04:48 with gcc 4.5.2
   configuration: --cc=/usr/local/gcc-4.5.2/bin/gcc --enable-gpl
   libavutil    50. 40. 0 / 50. 40. 0
   libavcodec   52.114. 0 / 52.114. 0
   libavformat  52.103. 0 / 52.103. 0
   libavdevice  52.  3. 0 / 52.  3. 0
   libavfilter   1. 76. 0 /  1. 76. 0
   libswscale    0. 12. 0 /  0. 12. 0
 [NULL @ 0x11ed650] Probed with size=2048 and score=100
 [theora @ 0x11f2250] Theora bitstream version 30201
 [ogg @ 0x11ed650] max_analyze_duration reached
 Input #0, ogg, from 'bad thumbnail from this video.ogv':
   Duration: 00:00:19.06, start: 0.000000, bitrate: 417 kb/s
     Stream #0.0, 0, 1/1: Data: skeleton
     Stream #0.1, 152, 1/30: Video: theora, yuv420p, 480x270 [PAR 1:1 DAR
 16:9], 1/30, 30 fps, 30 tbr, 30 tbn, 30 tbc
     Stream #0.2, 286, 1/44100: Audio: vorbis, 44100 Hz, mono, s16, 70 kb/s
     Metadata:
       ENCODER         : ffmpeg2theora-0.24
 new_video_stream: video_codec_tag: 0
 [buffer @ 0x13b94e0] w:480 h:270 pixfmt:yuv420p
 [setdar @ 0x13b9990] a:16/9
 [setdar @ 0x13b9990] w:480 h:270 -> dar:16/9 par:1/1
 [theora @ 0x11f2250] Theora bitstream version 30201
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf52.103.0
     Stream #0.0, 0, 1/30: Video: mpeg4, yuv420p, 480x270 [PAR 1:1 DAR
 16:9], 1/30, q=2-31, 200 kb/s, 30 tbn, 30 tbc
 Stream mapping:
   Stream #0.1 -> #0.0
 Press ctrl-c to stop encoding
 [theora @ 0x11f2250] vp3: first frame not a keyframe
 frame=  560 fps=  0 q=2.0 Lsize=    2032kB time=19.07 bitrate=
 873.1kbits/s
 video:2013kB audio:0kB global headers:0kB muxing overhead 0.958895%
 }}}

-- 
Ticket URL: <http://avcodec.org/trac/ffmpeg/ticket/15>
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