-i: This specifies the input file. In that case, it is (input.mp4).
-ss: Used with -i, this seeks in the input file (input.mp4) to position.
00:01:00: This is the time your trimmed video will start with.
-to: This specifies duration from start (00:01:40) to end (00:02:12).
00:02:00: This is the time your trimmed video will end with.
-c copy: This is an option to trim via stream copy. (NB: Very fast)
ffmpeg -ss 00:00:00 -i 1100_liu_video.mp4 -vf scale=1280:720 -to 00:14:28 1100_liu_video_720p.mp4
-i: This specifies the input file. In that case, it is (input.mp4). -ss: Used with -i, this seeks in the input file (input.mp4) to position. 00:01:00: This is the time your trimmed video will start with. -to: This specifies duration from start (00:01:40) to end (00:02:12). 00:02:00: This is the time your trimmed video will end with. -c copy: This is an option to trim via stream copy. (NB: Very fast)
reference: https://trac.ffmpeg.org/wiki/Scaling https://stackoverflow.com/questions/18444194/cutting-the-videos-based-on-start-and-end-time-using-ffmpeg