Embodiments of the present disclosure provide a solution for video processing. A method for video processing is proposed. The method comprises: determining, for a conversion between a current video block of a video and a bitstream of the video, motion information of the current video block, the current video block being coded with at least one of: an intra block copy (IBC) merge mode, an IBC with template matching mode, or an intra template matching mode; updating the motion information based on a constraint, the constraint indicating a target value of a component of the motion information; and performing the conversion based on the updated motion information.