With ffmpeg it literally takes out what you want so you can use it later. Eg. below -ss means starting time is 16 minutes and 30 seconds and -to means extract until 17 minutes and 23 seconds
-i = the input file
output file = CCME-flash-and-2-phone-setup-final.mp4
ffmpeg -i CCME-flash-and-2-phone-setup.mp4 -ss 00:16:30 -to 00:17:23 -c copy
How to specify until the end without specifying the time?
If we don't specify a -to then it will take everything from the start until the end and you don't have to specify when that is.
ffmpeg -i CCME-flash-and-2-phone-setup.mp4 -ss 00:16:30 -c copy