Image encoding/decoding method and recording medium therefor

A method for encoding a video, the method comprising:

• generating a merge candidate list of a current block;
• deriving first motion information for a first reference picture list and second motion information for a second reference picture list from the merge candidate list of the current block;
• and
• refining the first motion information and the second motion information based on a distortion calculated based on sum of absolute differences (SAD).

A non-transitory computer readable medium storing a bitstream generated by a method for encoding a video, wherein the method comprises:

• generating a merge candidate list of a current block;
• deriving first motion information for a first reference picture list and second motion information for a second reference picture list from the merge candidate list of the current block;
• and
• refining the first motion information and the second motion information based on a distortion calculated based on sum of absolute differences (SAD).