Encoding method and device therefor, and decoding method and device therefor

A video encoding method performed by a device and comprising:

• when at least one of a width and a height of a current coding unit is equal to or greater than a predetermined value, obtaining information indicating whether a combined prediction is applied for the current coding unit;
• when the information indicates that the combined prediction is applied for the current coding unit, obtaining an inter prediction block by performing inter prediction on the current coding unit using a merge candidate list;
• when the information indicates that the combined prediction is applied for the current coding unit, obtaining an intra prediction block by performing intra prediction on the current coding unit in a planar mode;
• and
• obtaining a combined prediction block of the current coding unit by combining the intra prediction block and the inter prediction block according to a weight value,
• wherein the predetermined value is 8.

A non-transitory storage medium storing data generated by a video encoding method comprising:

• when at least one of a width and a height of a current coding unit is equal to or greater than a predetermined value, obtaining information indicating whether a combined prediction is applied for the current coding unit;
• when the information indicates that the combined prediction is applied for the current coding unit, obtaining an inter prediction block by performing inter prediction on the current coding unit using a merge candidate list;
• when the information indicates that the combined prediction is applied for the current coding unit, obtaining an intra prediction block by performing intra prediction on the current coding unit in a planar mode;
• and
• obtaining a combined prediction block of the current coding unit by combining the intra prediction block and the inter prediction block according to a weight value,
• wherein the predetermined value is 8.