[FFmpeg-trac] #4746(swscale:closed): prores alpha blending results in opaque rectangle

[FFmpeg]

#4746: prores alpha blending results in opaque rectangle
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             Reporter:               |                    Owner:
  projectsymphony                    |                   Status:  closed
                 Type:  defect       |                Component:  swscale
             Priority:  normal       |               Resolution:  fixed
              Version:  git-master   |               Blocked By:
             Keywords:  prores       |  Reproduced by developer:  0
  alpha                              |
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by projectsymphony):

 I agree, that's why I would assume ffmpeg command line would be smart
 enough to apply that flag only when needed, for example, when needing to
 replicate the behaviour of the reference software rather than showing an
 opaque rectangle...

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Ticket URL: <https://trac.ffmpeg.org/ticket/4746#comment:19>
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