Use the crop filter:
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ffmpeg -i in.mp4 -filter:v "crop=out_w:out_h:x:y" out.mp4 |
Where the options are as follows:
out_wis the width of the output rectangleout_his the height of the output rectanglexandyspecify the top left corner of the output rectangle
Example 1
To crop a 80×60 section, starting from position (200, 100):
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ffmpeg -i in.mp4 -filter:v "crop=80:60:200:100" -c:a copy out.mp4 |
Example 2
To crop the bottom right quarter:
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ffmpeg -i in.mp4 -filter:v "crop=in_w/2:in_h/2:in_w/2:in_h/2" -c:a copy out.mp4 |
This is the same as:
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ffmpeg -i in.mp4 -filter:v "crop=320/2:240/2:320/2:240/2" -c:a copy out.mp4 |
Which is the same as:
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ffmpeg -i in.mp4 -filter:v "crop=160:120:160:120" -c:a copy out.mp4 |
Example 3
Crop 20 pixels from the top, and 20 from the bottom:
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ffmpeg -i in.mp4 -filter:v "crop=in_w:in_h-40" -c:a copy out.mp4 |
- The filter will automatically center the crop if
xandyare omitted such as in this example.
Previewing
You can take a crop (heh heh) and preview it live with ffplay:
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ffplay -i input -vf "crop=in_w:in_h-40" |
