[FFmpeg-trac] #9379(avfilter:new): v360 filter with alpha_mask and dfisheye output

[FFmpeg]

#9379: v360 filter with alpha_mask and dfisheye output
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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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 There is a small bug in the v360 filter with dfisheye output if the
 alpha_mask=1 option is used. A vertical line in the left half is made
 transparent.
 In this example I'm filling the transparent pixels with red color to show
 the problem:

 ffmpeg -f lavfi -i color=white:s=800x400 -f lavfi -i color=red:s=800x400
 -lavfi [0]v360=e:dfisheye:alpha_mask=1[a],[1][a]overlay -frames 1 -y
 out.png

 Suggestion for improvement: For fisheye and dfisheye output, there should
 be an option to make the output circular and fill the outer area
 transparent. In most cases the outer area of the circle is not required,
 and it might become faster.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9379>
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