2017-07-31 10:30 GMT+02:00 Paul B Mahol <one...@gmail.com>: > >> >> What exactly you tried? >> >> Perhaps you want premultiply filter? >> >> Yes I have a video and a lower third, and I want to overlay the lower > third. But my alpha channel from the lower third is not pre-devided with > the alpha channel, so I need to do a channel division in ffmpeg. > Something like: > > ffmpeg -i video.mp4 -i lowerthird.png -filter_complex > [1:v]geq=r=r/a:g=g/a:b=b/a[gq];[0:v][gq]overlay ... output.mp4 > > I see that you wrote a filter for this, but can you please give me an example of how it works? I don't get it to run. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
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