[FFmpeg-trac] #4998(avformat:new): m4a files created by FFmpeg aren't supported by SanDisk Clip Sport/Jam.

[FFmpeg]

#4998: m4a files created by FFmpeg aren't supported by SanDisk Clip Sport/Jam.
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             Reporter:  bat999       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avformat
              Version:  unspecified  |               Resolution:
             Keywords:  aac mov      |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by bat999):

 OK

 Compiled "after" FFmpeg.
 git checkout fc09bf57a60d4c4a6d339b204b3282337067c06d

 Compiled "before" FFmpeg.
 git checkout 4dcd1a3145dd93602b86a44ebc07d98ca2a30ab6

 Created 15 second aac file with latest FFmpeg.
 ffmpeg -f lavfi -i sine=d=15 15sine.aac

 Muxed it with "after" FFmpeg.
 ffmpeg -i 15sine.aac -c copy -bsf:a aac_adtstoasc after.m4a

 Muxed it with "before" FFmpeg.
 ffmpeg -i 15sine.aac -c copy -bsf:a aac_adtstoasc before.m4a

 The "after.m4a" file doesn't play, the "before.m4a" file does play OK.
 Your suggestion was right.

 I also tested it with longer "before" m4a files.
 It will only play files of <= 41 seconds duration, but probably that is a
 different issue.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4998#comment:19>
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