Adaptive subblock size for affine motion compensation

A method of decoding video data, the method comprising:

• receiving a block of video data to be decoded using a subblock affine motion compensation mode;
• determining a size of one or more subblocks of the block based on one or more of an inter prediction direction or affine motion parameters of the block;
• partitioning the block into the one or more subblocks based on the determined size;
• and
• decoding the one or more subblocks using the subblock affine motion compensation mode.

A non-transitory computer-readable storage medium storing instructions that, when executed, cause one or more processors of a device configured to decode video data to:

• receive the block of video data to be decoded using a subblock affine motion compensation mode;
• determine a size of one or more subblocks of the block based on one or more of an inter prediction direction or affine motion parameters of the block;
• partition the block into the one or more subblocks based on the determined size;
• and
• decode the one or more subblocks using the subblock affine motion compensation mode.

An apparatus configured to decode video data, the apparatus comprising:

• means for receiving a block of video data to be decoded using a subblock affine motion compensation mode;
• means for determining a size of one or more subblocks of the block based on one or more of an inter prediction direction or affine motion parameters of the block;
• means for partitioning the block into the one or more subblocks based on the determined size;
• and
• means for decoding the one or more subblocks using the subblock affine motion compensation mode.