Method for encoding/decoding video signal and device therefor

A method of encoding a video, the method comprising:

• determining whether a merge mode with prediction unit (PU) partitioning is applied to a current block or not, wherein in response that the merge mode with PU partitioning is applied to the current block, the method further comprises:
• determining a partition type of the current block, the current block being divided into a first partition and a second partition;
• obtaining first motion information for the first partition based on a first merge candidate included in a merge candidate list of the current block;
• and
• obtaining second motion information for the second partition based on a second merge candidate included in the merge candidate list of the current block,
• wherein a merge flag indicating whether a merge mode is applied to the current block or not is encoded into a bitstream, the merge mode with PU partitioning being performed in response to the merge mode being applied to the current block,
• wherein a first merge index specifying the first merge candidate is encoded into the bitstream,
• wherein a second merge index specifying the second merge candidate is encoded into the bitstream,
• wherein the merge mode with PU partitioning is allowed for the current block only when a width-height ratio of the current block and a height-width ratio of the current block are less than a threshold value,
• wherein the partition type of the current block is selected among a plurality of partition type candidates, and
• wherein the plurality of partition type candidates includes a first partition type candidate in which a size of the first partition and a size of the second partition are mutually the same and a second partition type candidate in which the size of the first partition and the size of the second partition are different from the each other.

A non-transitory computer readable recording medium for storing instructions which when executed by a processor cause the processor to transmit compressed video data, the compressed video data being generated by an encoding method which comprising:

• determining whether a merge mode with prediction unit (PU) partitioning is applied to a current block or not, wherein in response that the merge mode with PU partitioning is applied to the current block, the method further comprises:
• determining a partition type of the current block, the current block being divided into a first partition and a second partition;
• obtaining first motion information for the first partition based on a first merge candidate included in a merge candidate list of the current block;
• and
• obtaining second motion information for the second partition based on a second merge candidate included in the merge candidate list of the current block,
• wherein a merge flag indicating whether a merge mode is applied to the current block or not is encoded into a bitstream, the merge mode with PU partitioning being performed in response to the merge mode being applied to the current block,
• wherein a first merge index specifying the first merge candidate is encoded into the bitstream,
• wherein a second merge index specifying the second merge candidate is encoded into the bitstream,
• wherein the merge mode with PU partitioning is allowed for the current block only when a width-height ratio of the current block and a height-width ratio of the current block are less than a threshold value,
• wherein the partition type of the current block is selected among a plurality of partition type candidates, and
• wherein the plurality of partition type candidates includes a first partition type candidate in which a size of the first partition and a size of the second partition are mutually the same and a second partition type candidate in which the size of the first partition and the size of the second partition are different from the each other.