[FFmpeg-user] Best place for despill filter?

[Paul B Mahol]

On Mon, Nov 16, 2020 at 7:45 PM Michael Koch <astroelectronic at t-online.de>
wrote:

> Am 16.11.2020 um 16:12 schrieb 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.
>
> Is it possible to send zmq messages to the despill filter? I want to
> adjust the mix, expand and brightness parameters in real time. I'm
> sending the zmq messages from my own C# program. Messages to colorkey
> (color, similarity) and overlay (x, y) are already working. When I send
> messages to the despill filter, there is no error message but nothing
> changes in the output video. Either I have something wrong in my code,
> or the despill filter doesn't use the new values.
>

Nowhere is documented that despill have support for commands and thus it
does not have
support for commands.

>
> Michael
>
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