Ffmpeg Command
# copy mp4 video file from time 00:40:21 to 00:41:12 to 40-21_41-12.mp4
ffmpeg -i source.mp4 -ss 00:40:21 -to 00:41:12 -c copy 40-21_41-12.mp4
# copy mp4 video file from time 00:40:21 to 00:41:12 to 40-21_41-12.mp4
ffmpeg -i source.mp4 -ss 00:40:21 -to 00:41:12 -c copy 40-21_41-12.mp4