Coding mode selection method and apparatus, and electronic device and computer-readable medium

An apparatus, comprising:

• at least one memory configured to store computer program code;
• and
• at least one processor configured to access said computer program code and operate as instructed by said computer program code, said computer program code comprising:
• first acquiring code configured to cause the at least one processor to acquire a target frame image of a target video;
• first determining code configured to cause the at least one processor to determine a target coding unit based on the target frame image, the target coding unit comprising a prediction unit;
• first obtaining code configured to cause the at least one processor to obtain a rate-distortion cost of a symmetric inter prediction mode and obtain a rate-distortion cost of a motion merge prediction mode by separately performing estimation on the prediction unit in the symmetric inter prediction mode and estimation on the prediction unit in the motion merge prediction mode;
• second determining code configured to cause the at least one processor to determine a first candidate prediction mode based on the rate-distortion costs of the symmetric inter prediction mode and the motion merge prediction mode;
• third determining code configured to cause the at least one processor to determine a second candidate prediction mode set in asymmetric inter prediction modes based on the first candidate prediction mode;
• second obtaining code configured to cause the at least one processor to obtain a rate-distortion cost of the second candidate prediction mode set by performing estimation on the prediction unit in a first candidate asymmetric inter prediction mode in the second candidate prediction mode set based on the second candidate prediction mode set being not empty;
• and
• fourth determining code configured to cause the at least one processor to determining a target prediction mode of the target coding unit based on rate-distortion costs of the first candidate prediction mode and the second candidate prediction mode set.

A non-transitory computer-readable storage medium storing computer instructions that, when executed by at least one processor of a device, cause the at least one processor to:

• acquire a target frame image of a target video;
• determine a target coding unit based on the target frame image, the target coding unit comprising a prediction unit;
• obtain a rate-distortion cost of a symmetric inter prediction mode and obtain a rate-distortion cost of a motion merge prediction mode by separately performing estimation on the prediction unit in the symmetric inter prediction mode and estimation on the prediction unit in the motion merge prediction mode;
• determine a first candidate prediction mode based on the rate-distortion costs of the symmetric inter prediction mode and the motion merge prediction mode;
• determine a second candidate prediction mode set in asymmetric inter prediction modes based on the first candidate prediction mode;
• obtain a rate-distortion cost of the second candidate prediction mode set by performing estimation on the prediction unit in a first candidate asymmetric inter prediction mode in the second candidate prediction mode set based on the second candidate prediction mode set being not empty;
• and
• determine a target prediction mode of the target coding unit based on rate-distortion costs of the first candidate prediction mode and the second candidate prediction mode set.