[email protected] (12020-09-12): > But if I create a trivial filter: ^^^^^^^ > > ffmpeg -i a.mov -i b.mov -filter_complex '[0:v][1:v]overlay' out.mov ^^^^^^^
There's your problem: your filter is not trivial at all. Overlay requires compatibility between the formats of its inputs, and therefore cannot work with the normal format negotiation. I suggest you peruse its documentation to see how to set the format. Regards, -- Nicolas George
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