A bit rate control method for 8k-oriented avs2 ultra-high-definition video coding
A technology for bit rate control and clear video, applied in the field of video coding, which can solve problems such as bit rate increase, buffer overflow, complexity change, etc.
Active Publication Date: 2021-10-15
HANGZHOU ARCVIDEO TECHNOLOGY CO LTD
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[0006] The complexity of each frame in the video source is different. Once the scene is switched, the complexity will change greatly, which will easily cause the output code stream to no longer be sent to the network at a constant bit rate, resulting in buffer overflow (buffer saturation exceeds The maximum value of the buffer or less than 0), which has very high requirements for the rate control algorithm
The original AVS2 method failed to analyze the occupancy of the buffer by several frames in the future. When the video content is switched from a simple scene to a complex scene, the bit rate will suddenly increase, causing the buffer to underflow, and the output will be cut off.
In addition, in order to improve the encoding speed, the original method puts RDO and entropy encoding in two different threads. The progress of entropy encoding is far behind RDO, so the number of bits calculated by entropy encoding of each CU cannot be updated to the buffer in real time, further causing code Inaccurate rate control
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[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0035] A bit rate control method for 8K-oriented AVS2 ultra-high-definition video encoding, specifically comprising the following steps:
[0036] (1) In frame layer rate control, before encoding the i-th frame, the quantization step size q is calculated according to the video target bit rate C, the weight of the i-th frame in miniGOP, and the i-th frame’s SATD value D(i) (i), and calculate the SATD values of the i+1, i+2, ..., i+N frames, respectively marked as D(i+1), D(i+2), ..., D(i+N) , where N is a constant;
[0037] (2) Use the RQ model to calculate the estimated number of bits of the i, i+1, i+2, ..., i+N frames, which are marked as R(i), R(i+1), R(i+ 2), ...., R(i+N); the formula for calculating the estimated number of bits using the RQ model is as follows:
[0038]
[0039] Among them: a, b and c are model parameters respecti...
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The invention discloses a code rate control method for 8K-oriented AVS2 ultra-high-definition video coding. It specifically includes the following steps: (1) In the frame layer code rate control, before encoding the i-th frame, according to the video target code rate C, the weight of the i-th frame in miniGOP and the SATD value D(i) of the i-th frame Find the quantization step size q(i), and calculate the SATD value of the next N frames; (2) use the RQ model to calculate the estimated number of bits from the i-th to i+N frames; (3) define the buffer of the i-th frame Prediction value F(i), determine whether F(i) is less than 0.5 or greater than 0.8, to determine the optimal quantization step size; (4) start encoding the jth CU in the i-th frame, and determine whether the jth CU is the current The last CU in the frame, if so, update the buffer and execute step (1), otherwise execute step (4). The beneficial effects of the invention are: the buffer zone can be updated in time, the buffer zone can be effectively controlled, the code rate overflow can be reduced, and the stability of the coding quality can be improved.
Description
technical field [0001] The present invention relates to the technical field of video coding, in particular to a code rate control method for 8K-oriented AVS2 ultra-high-definition video coding. Background technique [0002] AVS2 is the second-generation digital video coding standard in my country. It specifies the decoding process of an efficient video compression method that adapts to various bit rates, resolutions, and quality requirements. Under the same compression efficiency, its coding speed can reach that of the open source platform x265. More than 8 times, very suitable for 4K / 8K ultra-high-definition TV live broadcast applications. 4K / 8K video has a large amount of data and requires high network bandwidth. In addition, 4K / 8K real-time live broadcast usually requires the speed of the encoder to reach more than 50 frames per second. How to improve video output under certain network bandwidth and speed requirements Quality is a key to the development of video coding te...
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IPC IPC(8): H04N19/152H04N19/149H04N19/124H04N19/177
CPCH04N19/124H04N19/149H04N19/152H04N19/177
Inventor 廖义李日谢亚光
Owner HANGZHOU ARCVIDEO TECHNOLOGY CO LTD