Am 24.09.2020 um 13:50 schrieb Paul Bourke:
How do I change the colour actually used as the chromakey colour?
I am creating remap filters to do various image mappings and would
like undefined pixels to be black rather than green.
Apologies in advance if I simply didn't search the documentation
sufficiently well.

Use the "fill" option of the remap filter.
There is an example in chapter 2.66 of my book:
http://www.astro-electronic.de/FFmpeg_Book.pdf

Michael


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