How can I use ffmpeg to crop a video?

To crop a video using ffmpeg, you can use the "crop" filter with the following command:

ffmpeg -i input.mp4 -filter:v "cropw:h:x:y" output.mp4

Replace "input.mp4" with the name of your input video file, "w" and "h" with the width and height of the cropped area, and "x" and "y" with the starting position of the crop.