I would try the -to
option with a negative duration. (I'm assuming negative duration counts from the end of the file instead of the beginning.)
this post was submitted on 04 Dec 2024
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I think this is the easiest. But, -to
can't do negative times. You need to nest a different comment inside the FFmpeg command to to the math.
I think this might work to remove 2 seconds from the end of a video
ffmpeg -ss 0 -i in.mp4 -t $(( $(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 in.mp4 |cut -d\. -f1) - 2 )) -c copy out.mp4