[FFmpeg-trac] #6037(avformat:new): mkv muxing broken

[FFmpeg]

#6037: mkv muxing broken
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             Reporter:  q3cpma       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avformat
              Version:  unspecified  |               Resolution:
             Keywords:  mkv          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by q3cpma):

 This is actually exactly like the link said.
 {{{
 ffmpeg -i 20s.mkv -map 0:v:0 -c:v ffv1 ffv1.mkv
 ffmpeg -i 20s.mkv -i ffv1.mkv -map 0:a -map 0:s -map 1:v -c copy out.mkv

 ffmpeg -i 20s.mkv -c:a copy -c:s copy -c:v ffv1 out2.mkv
 }}}
 out.mkv fails while out2.mkv works; when the operation is fundamentally
 the same.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6037#comment:6>
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