[FFmpeg-trac] #3(avcodec:new): Auto-detection of Sonic Foundry Soft Encode AC3 files with a 16-byte header fails

[FFmpeg]

#3: Auto-detection of Sonic Foundry Soft Encode AC3 files with a 16-byte header
fails
----------------------+---------------------
  Reporter:  cehoyos  |      Owner:  michael
      Type:  defect   |     Status:  new
  Priority:  normal   |  Component:  avcodec
   Version:  git      |   Keywords:
Blocked By:           |   Blocking:
Reproduced:  0        |   Analyzed:  0
----------------------+---------------------
 (issue 2647)
 Attached sample can be decoded with a52dec -o wav6 (shows many lines of
 "skip"), but auto-detection fails completely with FFmpeg, MPlayer, xine
 and vlc.

 It was produced with Sonic Foundry Soft Encode and every frame starts with
 a 16-byte header (possibly with timestamps).

 $ ffmpeg -i sonic.ac3
 FFmpeg version git-N-27832-g424ffee, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Mar  7 2011 23:17:15 with gcc 4.5.2
   configuration: --cc=/usr/local/gcc-4.5.2/bin/gcc --enable-gpl
   libavutil    50. 39. 0 / 50. 39. 0
   libavcodec   52.113. 2 / 52.113. 2
   libavformat  52.102. 0 / 52.102. 0
   libavdevice  52.  2. 3 / 52.  2. 3
   libavfilter   1. 76. 0 /  1. 76. 0
   libswscale    0. 12. 0 /  0. 12. 0
 sonic.ac3: Invalid data found when processing input

 $ ffmpeg -f ac3 -i sonic.ac3 out.wav
 FFmpeg version git-N-27832-g424ffee, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Mar  7 2011 23:17:15 with gcc 4.5.2
   configuration: --cc=/usr/local/gcc-4.5.2/bin/gcc --enable-gpl
   libavutil    50. 39. 0 / 50. 39. 0
   libavcodec   52.113. 2 / 52.113. 2
   libavformat  52.102. 0 / 52.102. 0
   libavdevice  52.  2. 3 / 52.  2. 3
   libavfilter   1. 76. 0 /  1. 76. 0
   libswscale    0. 12. 0 /  0. 12. 0
 [ac3 @ 0x11e4650] max_analyze_duration reached
 [ac3 @ 0x11e4650] Estimating duration from bitrate, this may be inaccurate
 Input #0, ac3, from 'sonic.ac3':
   Duration: 00:00:37.44, bitrate: 447 kb/s
     Stream #0.0: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
 Output #0, wav, to 'out.wav':
   Metadata:
     encoder         : Lavf52.102.0
     Stream #0.0: Audio: pcm_s16le, 48000 Hz, 5.1, s16, 4608 kb/s
 Stream mapping:
   Stream #0.0 -> #0.0
 Press [q] to stop encoding
 [ac3 @ 0x11ef090] frame sync error
 Error while decoding stream #0.0
 Error while decoding stream #0.0

 ...

 Error while decoding stream #0.0imes
 Error while decoding stream #0.0imes
     Last message repeated 1159 times
 [ac3 @ 0x11ef090] incomplete frame
 size=   20880kB time=37.12 bitrate=4608.0kbits/s
 video:0kB audio:20880kB global headers:0kB muxing overhead 0.000318%

 out.wav plays fine.

-- 
Ticket URL: <http://avcodec.org/trac/ffmpeg/ticket/3>
FFmpeg <http://avcodec.org/trac/ffmpeg>
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