Overlapped block motion compensation

An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

• determine, during a conversion between a current block of a video and a bitstream of the video, a motion vector for a first sub-block inside the current block;
• and
• perform the conversion base on an overlapped block motion compensation (OBMC) mode applied to a translational motion mode;
• wherein the OBMC mode uses intermediate prediction values of the first sub-block based on the motion vector of the first sub-block and prediction values of at least a second video unit that is neighboring the first sub-block to generate final prediction values for the first sub-block;
• wherein a size of the first sub-block is based on motion information of the current block;
• and
• wherein the OBMC mode is not applied to the current block in case that the current block has a width w greater than or equal to a seventh threshold T7 or a height h greater than or equal to an eighth threshold T8, where T7 and T8 are 128.

A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:

• determining a motion vector for a first sub-block inside a current block of the video;
• and
• generating the bitstream of the video from the current block based on an overlapped block motion compensation (OBMC) mode applied to a translational motion mode;
• wherein the OBMC mode uses intermediate prediction values of the first sub-block based on the motion vector of the first sub-block and prediction values of at least a second video unit that is neighboring the first sub-block to generate final prediction values for the first sub-block;
• wherein a size of the first sub-block is based on motion information of the current block;
• and
• wherein the OBMC mode is not applied to the current block in case that the current block has a width w greater than or equal to a seventh threshold T7 or a height h greater than or equal to an eighth threshold T8, where T7 and T8 are 128.