[FFmpeg-trac] #4017(avfilter:new): noise filter breaks when combined with scaling

[FFmpeg]

#4017: noise filter breaks when combined with scaling
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             Reporter:  rmk         |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:  noise       |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by rmk):

 Just compare the respective versions of ..._clip1.png and ..._clip2.png
 clipped out of the 4k output frames.

 I have to correct myself. Pixel format conversion does not really make
 sense as an explanation as that should also occur when doing the same with
 1920x1080 (attaching clips from output frames as well).

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Ticket URL: <https://trac.ffmpeg.org/ticket/4017#comment:4>
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