Code rate control method and system, server and readable storage medium

The present invention provides a code rate control method and system, a server, and a readable storage medium. The code rate control method includes the steps: according to an actual code stream of animage of the previous frame, an actual code stream of an image of the current frame, and a target code stream of the current frame, obtaining a target code stream of a current macroblock or a codingtree of the image of the current frame; and acquiring quantization parameters of the current macroblock or the coding tree quantization process according to the target code stream of the current macroblock or the coding tree. The code rate control method guides allocation of the target code stream size of the macroblock or the coding tree corresponding to the current frame according to the actualcode stream size of each macroblock or coding tree of the previous frame, thus effectively improving the accuracy of the code stream size of the current frame, being small in the computational complexity, and being easy for har