[FFmpeg-trac] #4992(undetermined:new): fragmented ismv to mp4 muxing produces unreadable file

[FFmpeg]

#4992: fragmented ismv to mp4 muxing produces unreadable file
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             Reporter:  abaudoux  |                    Owner:
                 Type:  defect    |                   Status:  new
             Priority:  normal    |                Component:  undetermined
              Version:  2.8.1     |               Resolution:
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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Comment (by cehoyos):

 Replying to [ticket:4992 abaudoux]:
 > The generated .mp4 file fails to open in some programs (final cut pro 7
 for example) due to a "bad format" error.

 Why does this indicate a bug in FFmpeg? Does the file work with vlc? With
 QT or WMP?

 Is the issue reproducible if you remux audio-only ({{{-vn}}})? Or video-
 only ({{{-an}}})?
 Is it reproducible if you remux video and reencode audio? Or if you remux
 audio and reencode video?
 Is the issue also reproducible if you remux only a short portion of the
 input file with {{{-t 10}}}?

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Ticket URL: <https://trac.ffmpeg.org/ticket/4992#comment:7>
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