It's just for preview / playback purposes. This doesn't modify the input.mp4 video in any way, and it doesn't produce a new video. You can preview (play) the video cropping without waiting for its re-encoding by playing it with ffplay (useful for quickly seeing if the crop region is correct), like this:įfplay -filter:v "crop=w:h:x:y" input.mp4 This may sound a bit complicated, but you'll see in the examples that's not the case so much (but of course, it depends on what you want to achieve). iw/2 for half the input video width, or ih-100 to subtract 100 pixels from the input video height).
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