
it always the right movie that is out of sync, even when i switch them. The problem is that in the output file the audio of the right movie is out of sync in its second time (the second concat). The third command takes the 2 results and merge it to one movie side by side with a logo: ffmpeg -i Concat1.mp4 -i Concat2.mp4 -i logo.png -filter_complex "pad=width=iw+20:height=ih+20:x=10:y=10:color=black pad=width=iw+20:height=ih+20:x=10:y=10:color=black nullsrc=size=640x480 setpts=PTS-STARTPTS, scale=320x480 setpts=PTS-STARTPTS, scale=320x480 overlay=shortest=1 overlay=320:0 apad amerge=inputs=2,pan=stereo|FL This Robot is able to generate a video from: The /video/merge Robot composes a new video by adding an audio track to existing still image(s) or video.