Minimum process grid for inter-prediction-related video coding processes

A device for decoding video data, the device comprising:

• one or more memory units configured to store video data;
• one or more processors implemented in circuitry, coupled to the one or more memory units, and configured to:
• perform motion compensation for a block of video data using a first process grid size;
• determine a second process grid size for a subsequent inter-prediction-related video coding process, wherein the second process grid size is larger than the first process grid size;
• determine whether the block of video data has at least one sample that has a different motion vector than at least one other sample in a block of the second process grid size;
• in response to determining that the block of video data has at least one sample that has the different motion vector than at least one other sample in the block of the second process grid size, perform the subsequent inter-prediction-related video coding process for the block of video data using the second process grid size;
• and
• output a decoded version of the block of video data.

A computer-readable storage medium storing instructions that when executed by one or more processors cause the one or more processors to:

• perform motion compensation for a block of video data using a first process grid size;
• determine a second process grid size for a subsequent inter-prediction-related video coding process, wherein the second process grid size is larger than the first process grid size;
• determine whether the block of video data has at least one sample that has a different motion vector than at least one other sample in a block of the second process grid size;
• in response to determining that the block of video data has at least one sample that has the different motion vector than at least one other sample in the block of the second process grid size, perform the subsequent inter-prediction-related video coding process for the block of video data using the second process grid size;
• and
• output a decoded version of the block of video data.

A device for decoding video data, the device comprising:

• means for performing motion compensation for a block of video data using a first process grid size;
• means for determining a second process grid size for a subsequent inter-prediction-related video coding process, wherein the second process grid size is larger than the first process grid size;
• means for determining whether the block of video data has at least one sample that has a different motion vector than at least one other sample in a block of the second process grid size;
• means for performing the subsequent inter-prediction-related video coding process for the block of video data using the second process grid size in response to determining that the block of video data has the at least one sample that has the different motion vector than the at least one other sample in a block of the second process grid size;
• and
• means for outputting a decoded version of the block of video data.