Entropy coding of motion vector differences

An encoder for encoding a video into a data stream, comprising:

• an inserter configured to:
• insert, into the data stream, an encoded binarized value of a motion vector difference, the motion vector difference representing a prediction error with respect to a motion vector used in motion-compensated prediction coding of a coding block of the video, wherein the binarized value of the motion vector difference includes (a) a prefix bin string including a truncated unary code based on a cutoff value equal to two, wherein each bin of the truncated unary code indicates whether an absolute value of the motion vector difference is greater than a respective fixed value, and (b) a suffix bin string including an Exp-Golomb code having a fixed order set to one, and
• insert, into the data stream, an index indicating a specific motion vector predictor of a set of motion vector predictors, wherein the set of motion vector predictors is determined based on motion vectors of neighbors of the coding block, and the motion vector difference is determined as a difference between the motion vector and the specific motion vector predictor.

A non-transitory computer-readable medium for storing data associated with a video, comprising:

• a data stream stored in the non-transitory computer-readable medium, the data stream comprising an encoded binarized value of a motion vector difference, the motion vector difference representing a prediction error with respect to a motion vector used in motion-compensated prediction coding of a coding block of the video, wherein the binarized value of the motion vector difference includes (a) a prefix bin string including a truncated unary code based on a cutoff value equal to two, wherein each bin of the truncated unary code indicates whether an absolute value of the motion vector difference is greater than a respective fixed value, and (b) a suffix bin string including an Exp-Golomb code having a fixed order set to one, and
• the data stream comprising an index indicating a specific motion vector predictor of a set of motion vector predictors, wherein the set of motion vector predictors is determined based on motion vectors of neighbors of the coding block, and the motion vector difference is determined as a difference between the motion vector and the specific motion vector predictor.