Crop area with size 100x100 at position (12,34).
crop=100:100:12:34
Using named options, the example above becomes:
crop=w=100:h=100:x=12:y=34
Crop the central input area with size 100x100:
crop=100:100
Crop the central input area with size 2/3 of the input video:
crop=2/3*in_w:2/3*in_h
Crop the input video central square:
crop=out_w=in_h crop=in_h
Delimit the rectangle with the top-left corner placed at position 100:100 and the right-bottom corner corresponding to the right-bottom corner of the input image.
crop=in_w-100:in_h-100:100:100
Crop 10 pixels from the left and right borders, and 20 pixels from the top and bottom borders
crop=in_w-2*10:in_h-2*20
Keep only the bottom right quarter of the input image:
crop=in_w/2:in_h/2:in_w/2:in_h/2
Crop height for getting Greek harmony:
crop=in_w:1/PHI*in_w
Apply trembling effect:
crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(n/10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(n/7)
Apply erratic camera effect depending on timestamp:
crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(t*10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(t*13)"
Set x depending on the value of y:
crop=in_w/2:in_h/2:y:10+10*sin(n/10)