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" ou

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