cl (channel layout) should also match the audio from your videos.r (sample rate) should match that of the audio tracks from the videos you want to concatenate.r (frame rate) should also match your videos (especially if your want a constant frame rate output).s (size) should match that of the videos you want to concatenate.Of course, change the parameters according to your videos and what you want to achieve. Use lavfi filters to generate your empty clip. A not fully one-liner solution 1) Generate black clips ffmpeg -f lavfi -i "color=black:s=1920x1080:r=30" \
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