[FFmpeg-user] Best place for despill filter?

[Paul B Mahol]

On Mon, Nov 16, 2020 at 12:41 PM Michael Koch <astroelectronic at t-online.de>
wrote:

> Am 16.11.2020 um 12:22 schrieb Paul B Mahol:
> > On Mon, Nov 16, 2020 at 12:13 PM Michael Koch <
> astroelectronic at t-online.de>
> > wrote:
> >
> >> When I overlay a bluescreen foreground video over a background video,
> >> which is the best place for the despill filter? (a) before colorkey or
> >> (b) after colorkey or (c) after overlay?
> >>
> >> [foreground](a),colorkey,(b)[fg];[background][fg]overlay,(c)
> >>
> >> I found here an example for (c) but I doubt that this makes sense:
> >> https://gist.github.com/kerbeh/fbe0cd0d89c424708c119e0a0d00ca88
> >>
> >>
> > Why do you doubt that it does make sense?
>
> I doubt that (c) is the right place because at position (c) the despill
> filter also affects the background video, which surely doesn't have any
> contamination from the bluescreen.
>

Then use it after colorkey.


>
> Michael
>
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