[FFmpeg-trac] #8468(ffmpeg:new): VP9 will not encode in yuva420p

[FFmpeg]

#8468: VP9 will not encode in yuva420p
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             Reporter:  doard   |                    Owner:
                 Type:  defect  |                   Status:  new
             Priority:  normal  |                Component:  ffmpeg
              Version:  4.2     |               Resolution:
             Keywords:          |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
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Comment (by doard):

 Looking at the output I noticed metadata contains "alpha_mode      : 1"
 which tells me that there maybe alpha data encoded in the video but not
 used by default. My question would be how do I tell the decoder in C code
 to add the alpha information into AVFrame? I'd be happy with command line
 as well.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8468#comment:1>
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