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

[Paul B Mahol]

On 7/19/20, Steinar H. Gunderson <steinar+ffmpeg at gunderson.no> wrote:
> On Sun, Jul 19, 2020 at 09:02:30PM +0200, Paul B Mahol wrote:
>>> Yes, this is the non-recursive version, which is O(n) in the number of
>>> samples. This is why I recommended the recursive version, which is O(log
>>> n)
>>> in the number of samples and thus avoids the problem with big lengths.
>>> It is fairly straightforward to convert one to the other.
>> Really? How so?
>
> As previously mentioned, you do two samples, then save to a temporary
> buffer,
> two samples from that buffer with half the distance and so on until your
> samples are only one pixel apart.
>
> You can also try doing three or four samples at a time instead of two;
> experiment a bit and see what gives the best performance.

This is very slow.

>
> /* Steinar */
> --
> Homepage: https://www.sesse.net/
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