[FFmpeg-trac] #1796(undetermined:new): Unable to extract PCM audio track from AVI file

[FFmpeg]

#1796: Unable to extract PCM audio track from AVI file
-------------------------------------+-------------------------------------
             Reporter:  tom_bogle    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: I have an AVI-wrapped dvvideo file with a single
 pcm_s16le audio track. The video plays fine (although there is a funny
 noise at the start that might indicate some kind of corruption or encoding
 problem). I am able to extract the audio using MPlayer, and ffmpeg can
 successfully produce a lower-quality avi file and extract the audio as
 mp3. I am able to run ffmpeg a second time to get a WAV file from either
 of these. However, if I simply try to extract the audio track directly
 into a WAV file from the original AVI file, all I get is 0.03 seconds of
 noise. There is no error message, so the software I'm writing that is
 running ffmpeg and monitoring the output can't tell anything went wrong.

 How to reproduce:
 {{{
 % ffmpeg -i TruncatedPCMAudio.avi -vn -acodec copy temp.wav
   - OR -
 % ffmpeg -i TruncatedPCMAudio.avi -vn -acodec pcm_s16le temp.wav
 ffmpeg version N-40126-ga4b58fd
 built on Apr 26 2012 03:29:50 with gcc 4.6.3
 }}}

 ffmpeg -v 9 -loglevel 99 -i TruncatedPCMAudio.avi
 ffmpeg version N-40126-ga4b58fd Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Apr 26 2012 03:29:50 with gcc 4.6.3
   configuration: --enable-gpl --enable-version3 --disable-w32threads
 --enable-ru
 ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-
 libass
  --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable
 -libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-
 libope
 njpeg --enable-librtmp --enable-libschroedinger --enable-libspeex
 --enable-libth
 eora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc
 --enable-
 libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
 libxvid --e
 nable-zlib
   libavutil      51. 47.100 / 51. 47.100
   libavcodec     54. 15.100 / 54. 15.100
   libavformat    54.  3.100 / 54.  3.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 72.100 /  2. 72.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 11.100 /  0. 11.100
   libpostproc    52.  0.100 / 52.  0.100
 [avi @ 01d3c020] Format avi probed with size=2048 and score=100
 [AVI demuxer @ 01d3c680] use odml:1
 [avi @ 01d3c020] File position before avformat_find_stream_info() is 32768
 [avi @ 01d3c020] All info found
 [avi @ 01d3c020] File position after avformat_find_stream_info() is 185032
 Input #0, avi, from 'TruncatedPCMAudio.avi':
   Duration: 00:03:52.46, start: 0.000000, bitrate: 28855 kb/s
     Stream #0:0, 1, 1001/30000: Video: dvvideo, yuv411p, 720x480,
 1001/30000, 28
 771 kb/s, SAR 8:9 DAR 4:3, 29.97 tbr, 29.97 tbn, 29.97 tbc
     Stream #0:1, 1, 1/30000: Audio: pcm_s16le, 48000 Hz, 2 channels, s16,
 1536 k
 b/s
 At least one output file must be specified

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1796>
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