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

[Paul B Mahol]

On 7/17/20, Steinar H. Gunderson <steinar+ffmpeg at gunderson.no> wrote:
> 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.
>

You are deeply confused, filters are working just fine.

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