[FFmpeg-devel] [PATCH] avfilter: add radial and circular blur video filter

[Steinar H. Gunderson]

On Sun, Jul 12, 2020 at 01:01:07PM +0200, Paul B Mahol wrote:
> + at section rblur
> +Apply Radial blur filter.

I tried this; it looks very aliased and absolutely not like what I'd expect from a
radial blur at all.

  $ wget https://upload.wikimedia.org/wikipedia/commons/thumb/c/c1/PM5644.svg/1000px-PM5644.svg.png
  $ ./ffmpeg -i 1000px-PM5644.svg.png -vf rblur ffmpeg-radialblur.png

produces

  https://storage.sesse.net/ffmpeg-radialblur.png

This is what the GIMP's “Zoom Blur” gives me on the same picture, and what I
expect a radial blur to look like:

  https://storage.sesse.net/gimp-radialblur.png
  
The circular blur looks like the right effect, but it's again very aliased
and has some sort of accuracy problem:

  http://storage.sesse.net/ffmpeg-circularblur.png

Look at the vertical lines in the left part of the picture; they have some
weird kind of staircase effect.

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