To get around this, for h264 and h265 videos, you can set some metadata in the video so it will just play back cropped instead, so you are not changing the video track itself. The previous command will result in doing a re-encode of the video, which will work on any video format, but you are performing a re-encode, so you are likely to lose quality and have to tweak the other ffmpeg settings like CRF etc.
vf crop=$WIDTH:$HEIGHT:$TOP_LEFT_X:$TOP_LEFT_Y \ You will want to test that your setting are correct before kicking off a re-encoding. Unfortunately, this will be re-encoding the video, so you may want to add a few options like: TOP_LEFT_X=0 filter:v "crop=$WIDTH:$HEIGHT:$TOP_LEFT_X:$TOP_LEFT_Y" \ This is useful if you accidentally recorded two 1080p monitors and just want the left one. The following command will crop your video to the left side of the video using the first 1920 x 1080 pixels.
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