Method for Deriving a Motion Vector

A method for processing video comprising:

• generating a first list of motion vectors, each motion vector in the first list of motion vectors corresponding to an available neighboring block of a current block in a current frame of the video, wherein each corresponding available neighboring block is an above block of the current block, a left block of the current block or an above left block of the current block in the current frame;
• selecting at least one motion vector for a block in a previous frame by:
• deriving coordinates of a position of the at least one block in the previous frame by performing a flooring function,
• wherein the flooring function operates an arithmetic right shift operation based on a top-left position of the current block followed by an arithmetic left shift operation, and
• wherein a magnitude of the arithmetic right shift operation is the same as a magnitude of the arithmetic left shift operation;
• generating a second list comprising the at least one motion vector for the block in the previous frame;
• generating a third list of candidate motion vectors comprising the motion vector in the first list and the at least one motion vector in the second list;
• selecting a motion vector from the third list as a motion vector predictor for the current block;
• deriving a motion vector difference between the motion vector predictor for the current block and a motion vector for the current block;
• generating a motion vector control parameter corresponding to the motion vector predictor for the current block;
• and
• wherein the motion vector control parameter and the motion vector difference are used to decode a bitstream.