[FFmpeg-trac] #3271(avcodec:open): Allow using additional pixel formats with libvpx-vp9

[FFmpeg]

#3271: Allow using additional pixel formats with libvpx-vp9
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             Reporter:  GreatEmerald  |                    Owner:
                 Type:  enhancement   |                   Status:  open
             Priority:  wish          |                Component:  avcodec
              Version:  git-master    |               Resolution:
             Keywords:  libvpx        |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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Comment (by jzern):

 Alpha never made it to the final vp9 bitstream, but can be done in the
 same way as vp8 -- encoding and muxing the alpha plane separately.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3271#comment:5>
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