[FFmpeg-trac] #2605(avformat:new): Raw audio in MP4 container

[FFmpeg]

#2605: Raw audio in MP4 container
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             Reporter:  asukhanov    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avformat
              Version:  unspecified  |               Resolution:
             Keywords:  MOV MP4      |               Blocked By:
  demuxer                            |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by asukhanov):

 I had a chance to do some investigation.

 In file I provided to you Audio TRAK has wrong STSZ atom. Sample size must
 be = 4, but it 1.

 Before Patch
 http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=50059bde77674977d9134f3c1151a63cb7a2391c
 ffmpeg could find this bug in the stream (as long as it's PCM, we can
 calculate sample size) and fix it.

 Also please take a look on Audio STTS:

 EntryCount      2
 Entry[0].SampleCount    688128
 Entry[0].SampleDelta    0
 Entry[1].SampleCount    0
 Entry[1].SampleDelta    0

 As long as we do have 2 entries inside of audio STTS: condition inside of
 this 'if' statement = true:
 http://git.videolan.org/?p=ffmpeg.git;a=blob;f=libavformat/mov.c;h=d5e1f893f573d794a8a81c4e20dd2ae026034809;hb=HEAD#l1967

 so we use alt_sample_size = 1 (incorrect) instead of sample size = 4
 (correct)

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2605#comment:1>
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