[FFmpeg-trac] #4814(undetermined:new): swscale default alpha blending drops alpha

[FFmpeg]

#4814: swscale default alpha blending drops alpha
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             Reporter:  michael      |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  swscale,     |               Resolution:
  alpha                              |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by cehoyos):

 Replying to [comment:5 dbuitenh]:
 > My question is (regardless of what we chose the default blend
 pattern/colour to be):
 >
 > Will the blend colour be settable via the CLI? If not, it's next to
 useless, since it won't actually be possible to make it match some
 reference software, depending on the default chosen.

 The interface was done in a way that allows to set the background colour
 in the future but it was not implemented yet.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4814#comment:6>
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