[FFmpeg-trac] #11045(undetermined:new): vp9 in mp4 does not maintain transparency (yuva420p)

[FFmpeg]

#11045: vp9 in mp4 does not maintain transparency (yuva420p)
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             Reporter:  Jozef        |                    Owner:  (none)
  Chutka                             |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  7.0          |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by mkver):

 The alpha is a separate video bitstream that is independently encoded and
 exported via Matroska blockadditional side data. And the mp4 muxer
 completely ignores the latter; in other words, our mp4 muxer does not
 support vp9 with alpha.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11045#comment:1>
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