[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:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by cehoyos):

 Please repeat the test with the following, simplified command line so I
 can try to reproduce:
 {{{
 $ ffmpeg -i ticket4992.ismv -acodec copy -vcodec copy out.mp4
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4992#comment:16>
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