[FFmpeg-trac] #8463(avfilter:new): Screen blending regression

[FFmpeg]

#8463: Screen blending regression
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             Reporter:  antmarot     |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  blend        |               Blocked By:
  regression                         |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Changes (by cus):

 * cc: cus (added)


Comment:

 It is not a precision issue. The result depends on which pixel format the
 blend filter use, RGB or YUV. Blending in YUV gets you purple, blending in
 RGB gets you green. The automagically selected format can change
 (depending on what formats the filters support) between versions.

 So this is not necessarily a bug. Admittedly some blending modes makes
 little sense for YUV, and the filter gives you too much freedom here.
 Maybe an option should be added to the filter so you can limit the formats
 to RGB only to always get the expected results?

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Ticket URL: <https://trac.ffmpeg.org/ticket/8463#comment:5>
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