I have two videos merged into one file using below command. Unfortunately second video covers first video and it is not visible. How to make second video transparent (eg. 50%)?

ffmpeg -i in1.mp4 -i in2.mp4 -filter_complex "nullsrc=size=480x360 [base]; [0:v] setpts=PTS-STARTPTS, scale=480x360 [top]; [1:v] setpts=PTS-STARTPTS, scale=480x360 [bottom]; [base][top] overlay=shortest=1 [temp]; [temp][bottom] overlay=shortest=1" -acodec libvo_aacenc -vcodec libx264 out.pm4

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1 Answer

Use

ffmpeg \ -i in1.mp4 -i in2.mp4 \ -filter_complex " \ [0:v]setpts=PTS-STARTPTS, scale=480x360[top]; \ [1:v]setpts=PTS-STARTPTS, scale=480x360, \ format=yuva420p,colorchannelmixer=aa=0.5[bottom]; \ [top][bottom]overlay=shortest=1" \ -acodec libvo_aacenc -vcodec libx264 out.mp4

Set aa to the opacity value needed.

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