[FFmpeg-trac] #8234(avformat:closed): mp4 file with id3v2 tag detected as mp4 but still fails decoding

[FFmpeg]

#8234: mp4 file with id3v2 tag detected as mp4 but still fails decoding
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             Reporter:  Mattias      |                    Owner:  (none)
  Wadman                             |
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:  avformat
              Version:  git-master   |               Resolution:  invalid
             Keywords:  mov aac      |               Blocked By:
  id3v2                              |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Mattias Wadman):

 Yes maybe this is beyond what ffmpeg should workaroud, and sorry by "does
 not correctly compensate" i didn't mean ffmpeg was doing something wrong,
 more what was needed to make the specific file work.

 But it feels a bit confusing that ffmpeg do support reading id3v2 tags in
 the mp4 case but it will fail to decode samples if there was any prepended
 tags. Would it make sense to fail early in the mov demuxer with a more
 useful error? but what would be the condition, if file position > 0 when
 reading header it should fail, could that mess up other case like
 fragmented mp4?
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Ticket URL: <https://trac.ffmpeg.org/ticket/8234#comment:6>
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