Fill Foreground X Position

Sets the precise horizontal position of the foreground video within the fill canvas as a percentage. Overrides the horizontal component of fill-align when set.

fill-x accepts an integer from 0 (left edge) to 100 (right edge), where 50 is centered. Applies only when fit=fill or fit=fillmax is used.

Use fill-x when fill-align’s three-point snap (left/center/right) isn’t precise enough. fill-x=0 ≡ fill-align=left, fill-x=50 ≡ fill-align=center, fill-x=100 ≡ fill-align=right.