[FFmpeg-trac] #9742(avfilter:new): vignette filter is not centered

[FFmpeg]

#9742: vignette filter is not centered
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             Reporter:  Michael      |                     Type:  defect
  Koch                               |
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
                                     |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 The vignette effect isn't centered in the frame, if the default values for
 x0, y0 are used:

 ffmpeg -f lavfi -i color=white:size=8x8 -vf vignette=PI/4 -frames 1 -y
 out.png

 It would be better to use (w-1)/2 and (h-1)/2 as default values:

 ffmpeg -f lavfi -i color=white:size=8x8 -vf
 vignette=PI/4:x0=(w-1)/2:y0=(h-1)/2 -frames 1 -y out.png
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Ticket URL: <https://trac.ffmpeg.org/ticket/9742>
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