Device and method for coding video data

A method of decoding a bitstream performed by an electronic device, the method comprising:

• receiving an image frame of the bitstream;
• determining a block unit from the received image frame;
• determining a split line of the block unit;
• receiving first motion information and second motion information from a candidate list to reconstruct the block unit, wherein the first motion information includes a first list flag for selecting a first reference frame and the second motion information includes a second list flag for selecting a second reference frame;
• determining a sub-block in the block unit;
• determining whether the sub-block is included in a specific one of a plurality of block regions separated based on the split line, wherein the specific one of the plurality of block regions covers the split line;
• storing the first motion information as a stored motion information for the sub-block when the sub-block is included in a first one of the plurality of block regions corresponding to the first motion information;
• storing the second motion information as the stored motion information for the sub-block when the sub-block is included in a second one of the plurality of block regions corresponding to the second motion information, wherein each of the first one of the plurality of block regions and the second one of the plurality of block regions is different from the specific one of the plurality of block regions;
• comparing the first list flag with the second list flag when the sub-block is included in the specific one of the plurality of block regions;
• storing a predefined one of the first motion information and the second motion information as the stored motion information for the sub-block without checking whether the first reference frame and the second reference frame are included in a specific one of a plurality of reference lists indicated by a specific one of a plurality of flag values different from the first list flag and the second list flag when the first list flag is identical to the second list flag, wherein the predefined one of the first motion information and the second motion information is the second motion information;
• and
• reconstructing a following block based on the stored motion information when the following block is reconstructed based on the sub-block.

An electronic device for decoding a bitstream, the electronic device comprising:

• one or more processors;
• and
• one or more non-transitory machine-readable media coupled to the one or more processors and storing one or more machine-executable instructions that, when executed by at least one of the one or more processors, cause the electronic device to:
• receive an image frame of the bitstream;
• determine a block unit from the received image frame;
• determine a split line of the block unit;
• receive first motion information and second motion information from a candidate list to reconstruct the block unit, wherein the first motion information includes a first list flag for selecting a first reference frame and the second motion information includes a second list flag for selecting a second reference frame;
• determine a sub-block in the block unit;
• determine whether the sub-block is included in a specific one of a plurality of block regions separated based on the split line, wherein the specific one of the plurality of block regions covers the split line;
• store the first motion information as a stored motion information for the sub-block when the sub-block is included in a first one of the plurality of block regions corresponding to the first motion information;
• store the second motion information as the stored motion information for the sub-block when the sub-block is included in a second one of the plurality of block regions corresponding to the second motion information, wherein each of the first one of the plurality of block regions and the second one of the plurality of block regions is different from the specific one of the plurality of block regions;
• compare the first list flag with the second list flag when the sub-block is included in the specific one of the plurality of block regions;
• store a predefined one of the first motion information and the second motion information as the stored motion information for the sub-block without checking whether the first reference frame and the second reference frame are included in a specific one of a plurality of reference lists indicated by a specific one of a plurality of flag values different from the first list flag and the second list flag when the first list flag is identical to the second list flag, wherein the predefined one of the first motion information and the second motion information is the second motion information;
• and
• reconstruct a following block based on the stored motion information when the following block is reconstructed based on the sub-block.