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

FFmpeg trac at avcodec.org
Mon Nov 23 15:25:31 CET 2015


#4992: fragmented ismv to mp4 muxing produces unreadable file
-------------------------------------+-------------------------------------
             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
-------------------------------------+-------------------------------------

Comment (by abaudoux):

 I used the following command :
 {{{
 ffmpeg -i ~/Downloads/ticket4992.ismv  -acodec copy -vcodec copy
 -movflags faststart /tmp/out_fast_start.mp4
 }}}
 Attached is the diff of the resulting file (left) with the working file
 remuxed from TS (right). As you can see there are differences in the
 atoms. I'm not mp4 expert but I guess somehow remuxing to TS first solves
 the issue.
 Do you know if it is possible to ask ffmpeg to reconstruct the atoms, like
 when muxing from ts, when using a mp4 as input file?
 This way it would produce a readable file I guess.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4992#comment:17>
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