I'm trying to achieve complex effect with ffmpeg, but I seem to be failing the syntax of -filter_complex somewhere. The goal is to capture part of the screen (with UScreenCapture direct show device) ...
I need to blend an video with an semitransparent png like this: [1:0][0:0]blend=all_mode=average Seems like the transparency of png is ignored. What I missed? How to make the ffmpeg to respect ...