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

[Paul B Mahol]

On 7/18/20, Steinar H. Gunderson <steinar+ffmpeg at gunderson.no> wrote:
> On Sat, Jul 18, 2020 at 11:06:17AM +0200, Paul B Mahol wrote:
>>>>> The above picture pretty clearly shows otherwise...? Could you tell me
>>>>> where my confusion would lie?
>>>> The filter option amount/angle set is very small.
>>> It's the default value. Could you recommend a command line?
>> Unless you want to propose patch, no.
>
> OK, so the defaults create a broken image, and you're not willing to tell me
> what parameters to use without me proposing a patch? (What would that patch
> do?)
>
> I tried setting angle=50, and got
>
>   http://storage.sesse.net/ffmpeg-radialblur2.png
>
> which looks more like a radial blur, but still is broken. Note the strong
> aliasing (starburst) in the center, the jagged thick white lines (more
> aliasing) on the left and right sides, and the fact that the vertical white
> lines are all but gone.
>
> If a blur creates strong high-frequency components (ie., the very opposite
> of
> what a blur is supposed to do), it is a strong signal that the algorithm
> chosen is just fundamentally wrong.

Nope, algorithm is just fine. You are interpreting results wrongly.

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