[FFmpeg-trac] #9086(undetermined:new): Cannot copy vp9 stream from webm to mp4

[FFmpeg]

#9086: Cannot copy vp9 stream from webm to mp4
-------------------------------------+-------------------------------------
             Reporter:  yrrqxk       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  vp9          |               Blocked By:
  av_interleaved_write_frame         |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by mkver):

 There are two blocks with timestamp 5339ms in test.webm. The second of
 those is a keyframe, which points to an issue with concatenating together
 different segments. This leads to the error message when muxing into mp4.
 You can fix this video by muxing it with mkvmerge and specifying a default
 duration of 30000/1001p; notice that this might affect audio sync if there
 is audio for this file.

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Ticket URL: <https://trac.ffmpeg.org/ticket/9086#comment:3>
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