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by iso1631 2055 days ago
Assuming a 3840x2160 2x2 input

Top left: ffmpeg -i input.mov -vf "crop=1920:1080:0:0" out-tl.mp4

Top right: ffmpeg -i input.mov -vf "crop=1920:1080:1920:0" out-tr.mp4

Bottom left: ffmpeg -i input.mov -vf "crop=1920:1080:0:1080" out-bl.mp4

Bottom right: ffmpeg -i input.mov -vf "crop=1920:1080:1920:1080" out-br.mp4

Details at

https://www.ffmpeg.org/ffmpeg-filters.html#crop