Code rate control method and code rate control device

Abstract

The embodiment of the invention provides a code rate control method and a code rate control device, wherein the code rate control method comprises the following steps: acquiring and determining a frame level coding parameter according to a code rate control mode and a coding control parameter of a current short period in a long period, and sending the frame level coding parameter to a coder; acquiring second code stream information; according to the second code stream information, performing statistics for statistic information comprising complexity information of a current video frame, totalcoding bits of the current short period and coding quality information; when the long period is not ended, if the current short period is ended, acquiring and determining average code rate of neighboring next short period of the current short period in the long period according to the period length of the current short period, preset code rate control parameters and the statistic information, andthereby coding the video frame of the next short period through calculating the frame level coding parameter of the neighboring next short period. Through the method and device provided by the schemeof the invention, storage space can be allocated rationally under a condition that images are guaranteed to satisfy certain quality.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a code rate control method and device. Background technique [0002] In the process of video transmission or storage, in order to reduce the amount of transmitted or stored data, it is usually necessary to compress and encode the original video data. The motion complexity, dynamic texture, occlusion, and lighting changes of each frame will be different, so the data volume of the compressed frame will change, and the bit rate of video transmission per unit time will fluctuate. In actual video transmission or storage applications, due to the limitations of bandwidth and storage space, it is usually necessary to limit the maximum value and average value of the bit rate. The process of controlling some encoding parameters of the encoder to achieve the code rate generated by the encoder is the rate control process. The relationship between the code rate controller and th...

AI Technical Summary

Problems solved by technology

However, with this scheme, the adjustment margin of the target balance point is too small, and it can only cope with short-term image complexity. If the scene becomes complex for a long time, it is difficult to ensure that the bit rate of the idle period can be evenly distributed to the busy period, so that in the busy period Insufficient storage space for image quality

[0007] To sum up, the existing code rate control methods cannot reasonably allocate storage space under the condition of ensuring that the image meets a certain quality.

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