Code rate control method and device based on layered B frame and electronic equipment

Abstract

The invention provides a layered B frame-based code rate control method and device and electronic equipment, and the method comprises the steps: obtaining an original video signal; Performing resampling on the video signal, wherein the resampled video signal comprises a plurality of frames of images; Performing pre-coding processing on each frame of image to obtain a corresponding SATD value; Dividing the multi-frame image into a plurality of GOPs, and obtaining a target code rate of each GOP according to a preset coding parameter; Obtaining the target code rate of each frame of image according to the target code rate of the GOP and the SATD value of each frame of image; Obtaining a quantization parameter of the current frame image by using a preset linear model according to the target code rate of the current frame image; And adjusting the quantization parameter according to a preset condition, and then updating the linear model to obtain the quantization parameter of the next frame of image. The method can adaptively distribute the code rate of each frame according to the video content of the image, stabilize the coding code rate and improve the coding quality on the premise of limited bandwidth and no increase of complexity.

Description

technical field [0001] The present invention relates to the technical field of video image processing, in particular to a layered B-frame-based code rate control method, device and electronic equipment. Background technique [0002] With the rapid development of multimedia, network transmission and other technologies, the demand for video clarity is also increasing. In practical scenarios such as TV broadcasting, conference live broadcast, and telemedicine, low-latency UHD has huge application requirements. In order to transmit effective data when the channel bandwidth and transmission delay are limited, to ensure the playback quality of the video, it is usually necessary to control the bit rate of the encoding process. The so-called bit rate control is to encode the video by selecting a series of encoding parameters. The output bits of the encoder are adjusted in real time, so that the encoded bit rate meets the required bit rate limit, and the encoding distortion is minim...

AI Technical Summary

Problems solved by technology

In order to transmit effective data when the channel bandwidth and transmission delay are limited, to ensure the playback quality of the video, it is usually necessary to control the bit rate of the encoding process. The so-called bit rate control is to encode the video by selecting a series of encoding parameters. The output bits of the encoder are adjusted in real time, so that the encoded bit rate meets the required bit rate limit, and the encoding distortion is minimized. Compared with the traditional IBBBP structure, the layered B frame structure has higher encoding efficiency, but Rate control is also more difficult for layered B-frame structures because different temporal layers have different characteristics

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