ffmpeg -ss 01:17:04 -i input.mkv -to 01:34:16 -c:v copy -c:a copy trimmed_copy.mkv

ffmpeg -ss 00:00:03 -i inputVideo.mp4 -to 00:00:08 -c:v copy trim_ipseek_copy.mp4

Replace 00:00:00 with start and end time respectively.

See details of this at [1]

Extract First 2 Minutes

ffmpeg -ss 00:00:00 -i input.MOV -to 00:02:00 -c:v copy -c:a copy trimmed_copy.MOV

mkv for OBS

ffmpeg -ss 00:00:00 -i 1.mkv -to 01:22:00 -c:v copy -c:a copy trimmed_copy.mkv