Focal Point X

Sets the horizontal position of the focal point for a fit=crop crop, as a fraction of the frame width. The crop window slides to center on this point, clamping at the edges so it never runs off-frame.

fp-x accepts a float from 0.0 (left edge) to 1.0 (right edge). The default is 0.5 (centered). Requires crop=focalpoint to be set — a bare fp-x without the focalpoint trigger is ignored and the crop stays centered.

fp-x=0 is equivalent to crop=left; fp-x=1.0 is equivalent to crop=right. Use fp-x when you need a position between the compass endpoints, for example to keep a subject at 70% across the frame.