1. Use ffmpeg crop a part of video:
ffmpeg -i input.mp4 -filter:v "crop=640:1080:960:0" -c:a copy output.mp4
* 640: the width of cropped size
1080: the height of cropped size
960: x of top-left point
0: y of top-left point
2. Use ffmpeg crop a period of video:
ffmpeg -ss 00:01:00 -to 00:02:00 -i input.mp4 -c copy output.mp4
ffmpeg -i input.mp4 -ss 00:01:00 -to 00:02:00 -c copy output.mp4 (some version)
* -ss: start time
-to: end time
3. Use ffmpeg extract all the frames from a video:
ffmpeg -i o1.mp4 -r 1/1 ./o1/o1_%03d.jpg
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