[FFmpeg-trac] #2396(avfilter:new): Make the Blend effect work with yuvj420p pixel format

[FFmpeg]

#2396: Make the Blend effect work with yuvj420p pixel format
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             Reporter:  sun          |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:  avfilter
              Version:  unspecified  |               Resolution:
             Keywords:  blend        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by gjdfgh):

 The yuvj420p format is deprecated. It's redundant to yuv420p with correct
 color levels set. Wouldn't it be better to make AVFrame aware of color
 levels? You'd need this for correct vf_scale behavior anyway.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2396#comment:2>
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