H.265-baased rate control method, system and device

Abstract

The invention discloses an H.265-baased rate control method, system and device. The method comprises the following steps: judging whether a current frame is a scene switching frame; if yes, setting the current frame as an I frame, updating a quantization parameter according to the relation between the quantization parameter and a Lagrangian multiplier method coefficient, and carrying out target bit distribution on new GOP and new frame layers; if no, continuing to carry out target bit distribution on the new GOP and the new frame layers; calculating the quantization parameter by virtue of an R-Q model and a frame layer target bit distribution result; carrying out rate-distortion optimization according to the calculated quantization parameter, and selecting an optimal coding mode; coding inthe optimal coding mode; if the current frame is the last frame, ending the operation; and otherwise, updating model parameters. The system comprises modules (1-11). The device comprises a memory anda processor for executing the method. According to the method, the system and the device, the objective quality of scene switching videos can be improved; and the method, the system and the device can be widely applied to the video coding field.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to an H.265-based code rate control method, system and device. Background technique [0002] With the diversified development of video services and the popularity of ultra-high-definition video, the original video coding standard H.264 / AVC is increasingly unable to meet the needs, and people urgently need a new and more efficient video coding standard. H.265 is a new generation of video coding standard. It follows the basic framework of hybrid video coding of traditional video coding standards, but has made improvements and innovations in each coding module, such as the use of segmentation technology based on quadtree structure. Compared with H.264 / AVC, under the same application conditions and video quality, the code rate of H.265 is reduced by nearly half. [0003] In the process of video encoding, the quality of the output video is closely related to the bit rate us...

AI Technical Summary

Problems solved by technology

However, some existing rate control algorithms do not take into account the impact of scene switching on video coding and rate control in practical applications

Scene switching will cut off the time correlation between adjacent frames. If the encoder cannot adjust in time, it will lead to waste of encoding resources and lower compression efficiency. At the same time, the effectiveness of prediction model parameters will also be reduced, which will affect the accuracy of bit rate control. sex

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