I want to delay a video in a filter chain by 5 seconds, and then
combine it with the original video with hstack. I use the shortest=1
option, so that the output contains only the duration where both
videos overlap:
ffmpeg -f lavfi -i testsrc=duration=10:size=vga:rate=25
-filter_complex
split[a][b];[b]setpts=PTS+5/TB[c];[a][c]hstack=shortest=1 -y out1.mp4
This works as expected. The input length is 10s and the output length
is 5s.
However, when I use the same command line with another input video, I
don't get the expected result:
ffmpeg -i 308.mov -filter_complex
split[a][b];[b]setpts=PTS+5/TB[c];[a][c]hstack=shortest=1 -y out2.mp4
Just found a solution myself. It works fine if the delay time is
subtracted instead of added:
ffmpeg -i 308.mov -filter_complex
split[a][b];[b]setpts=PTS-5/TB[c];[a][c]hstack=shortest=1 -y out2.mp4
Michael
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