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 _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
