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

FFmpeg trac at avcodec.org
Mon Feb 15 21:48:29 EET 2021

#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 yrrqxk):

 Unfortunately it's not just this one file. I'm trying to grab a large
 amount of youtube videos with youtube-dl and I can't afford to manually
 intervene with each one (several exhibited the same issue before I gave

 I am assuming the DASH segments overlap by a bit at the beginning and end
 of each segment, with the keyframe being the first frame in the next
 segment. Is there maybe an -fflags setting to just take the data from only
 one of the files when there's an overlap? Why isn't this an issue when the
 file is transcoded?

Ticket URL: <https://trac.ffmpeg.org/ticket/9086#comment:4>
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