Video encoding method, encoder, system and computer storage medium

The embodiment of the invention discloses a video coding method, a coder, a system and a computer storage medium, and the method comprises the steps: determining a pre-parameter of a to-be-coded video, and determining a first Lagrange multiplier and a second Lagrange multiplier according to the pre-parameter; according to the first Lagrange multiplier and the second Lagrange multiplier, determining a target Lagrange multiplier; according to a first distortion measure criterion, determining a first distortion value, the first distortion measure criterion including a semantic distortion measure criterion; according to a second distortion measure criterion, determining a second distortion value, the second distortion measure criterion comprising a numerical error measure criterion; determining a target distortion value according to the first distortion value and the second distortion value; and determining coding parameters of the to-be-coded video by using the target Lagrange multiplier and the target distortio