[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):

 Please also test if the issue is reproducible with the attached file as
 input.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4992#comment:9>
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