[FFmpeg-trac] #7476(undetermined:new): Invalid pts and duration generated for mp4 when converting from webm

[FFmpeg]

#7476: Invalid pts and duration generated for mp4 when converting from webm
-------------------------------------+-------------------------------------
             Reporter:  jyavenard    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by Gyan):

 Replying to [comment:6 cehoyos]:
 > Replying to [comment:2 Gyan]:
 >
 > > Use
 > >
 > >     `ffmpeg -i MozilleTest -vsync vfr -c:v libx264 test.mp4`
 > >
 > > to preserve original timestamps with no frame duplication.
 >
 > This can produce an invalid mp4 file:
 91360ce61d00bb20429fb41857abebf50a5c6b1d

 The commit msg says that the muxer support VFR but sync issues are seen.
 In fact, that commit message doesn't indicate any standards-based
 deficiency of the muxer, so output ''may'' lead to undesired playback
 behaviour, but not an 'invalid' file.

 Replying to [comment:5 tdowdle]:
 >
 > If I try to stream the MP4 output file from safari on an Iphone (Iphone
 8) device it won't stream.  I just get an icon indicating that it can't
 even play it.

 Add `-movflags +faststart` and check.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7476#comment:7>
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