[FFmpeg-user] Best place for despill filter?
astroelectronic at t-online.de
Mon Nov 16 20:35:41 EET 2020
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>
>> 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>
>>>> 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?
>>>> I found here an example for (c) but I doubt that this makes sense:
>>> 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.
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