Video Stack Exchange - How can I crop a video with ffmpeg?. In my 1920 x 1080p movie, I had letterbox bars of height 130px, but it applies to top and bottom, so you have to subtract 130 from the 1080p height that you are cropping to get: ffmpeg \ This is really aggravating as you may wish to show the movie on a variety of screen aspect ratios, which can lead to black bars on the right and left too. Sometimes movie files will be "letterboxed" so that they will always show black bars. Likewise, if you wanted to keep the right monitor instead: ffmpeg \ The following would be useful if you had two 1920x1080p monitors side-by-side and you accidentally recorded your entire desktop, instead of just your left monitor: ffmpeg \ Example Crops Recorded Entire Desktop And Want Just One Screen When playing back the video, it worked in mplayer, but the resulted in the video being shifted down, and the bottom of the content being cropped-off/lost in both VLC and Kodi. This uses a different set of parameters to the previous command, which I actually find easier to work with. 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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