Crop video files with FFmpeg

I have previously written about how to trim video files with FFmpeg. It is also easy to crop a video file. Here is a short how-to guide for myself and others.

Cropping is not the same as trimming

This may be basic, but I often see the concepts of cropping and trimming used interchangeably. So, to clarify, trimming a video file means making it shorter by removing frames in the beginning and/or end. That is not the same as cropping a video file, which only selects a particular part of the video for export.

The one-liner

If you want to get it done, here is the one-liner:

ffmpeg -i input.avi ffmpeg -i output2.mp4 -vf crop=1920:1080:0:200 output.avi

There is more information about this command in many places (for example, here). the most critical parts of the above command are:

  • -vf is the command for “video filter”. It can also be spelt out as -filter:v.
  • crop=1920:1080:0:200 means to make a 1920×1080 video starting from the leftmost side of the source image (=0 pixels horizontally) and 200 pixels down from the top.

Of course, this command can be combined with other FFmpeg combinations.

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Alexander Refsum Jensenius is a music researcher and research musician living in Oslo, Norway.