Low-jitter code rate control method for 4K/8K ultra-high-definition video coding
A bit rate control, clear video technology, applied in the field of video coding, can solve the problems of bit rate overflow, large data volume, relatively high encoding and compression performance requirements, achieve the effect of stable buffer fluctuation and reduce buffer overflow
Active Publication Date: 2020-01-10
HANGZHOU ARCVIDEO TECHNOLOGY CO LTD
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The data volume of 4K / 8K video is large, and the requirements for encoding and compression performance are relatively high. At present, the encoding and compression standards adopted for 4K / 8K video at home and abroad mainly include HEVC and AVS2. Their compression efficiency is high but the computational complexity is relatively large. And 4K / 8K real-time live broadcast usually requires the speed of the encoder to reach more than 50 frames per second
After encoding the frames in the GOP on each node, the code streams of each node are merged according to the frame display order. Since the adjacent GOPs are distributed on different nodes, the respective buffers cannot communicate, which may cause code rate overflow, for example , when the first frame of the third GOP is encoded, the initial buffer size is the buffer saturation of the last frame of the first GOP, but the buffer saturation of the last frame of the second GOP cannot be obtained, when the second GOP and the second GOP When 3 GOPs are merged, the buffer saturation may exceed 1.0 to cause overflow or less than 0 to cause underflow
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[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0020] A low-jitter code rate control method for 4K / 8K ultra-high-definition video encoding, specifically comprising the following steps:
[0021] (1) The length of the GOP is set as integer N, and the initial buffer saturation of the GOP is set as T0, wherein the value range of T0 is 0~1.0, execute step (2);
[0022] (2) Start coding the jth frame in the i-th GOP, set its target buffer saturation size to a specified ratio, so that the buffer saturation size between adjacent GOPs is basically consistent, and perform step (3);
[0023] Specifically, start encoding the j-th frame in the i-th GOP, if the value of j is 0, set the initial buffer saturation to T0, and the target buffer saturation to 0.5-0.8; if the value of j is greater than 0 and less than a*N, set the saturation of the target buffer to 0.5~0.8, where a ranges from 0 to 1.0; if j i...
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The invention discloses a low-jitter code rate control method for 4K / 8K ultra-high-definition video coding. The method specifically comprises the following steps: (1) setting the length of GOP to be an integer N, setting the initial buffer saturation of GOP to be T0, setting the value range of T0 to be 0-1.0, and executing the step (2); (2) starting to encode the jth frame in the ith GOP, settingthe saturation degree of a target buffer area of the jth frame to be a specified proportion, enabling the saturation degrees of the buffer areas between the adjacent GOPs to be basically consistent, and executing the step (3); (3) calculating a quantization parameter QP of a jth frame in the ith GOP for encoding according to the saturation of the target buffer area, and executing the step (4); and(4) judging whether all GOPs and all frames in the current video are coded or not, if so, ending the current coding, and otherwise, executing the step (2). The beneficial effects are that the fluctuation of the buffer area is more stable during GOP parallel encoding, and the overflow problem of the buffer area is reduced.
Description
technical field [0001] The present invention relates to the technical field of video coding, in particular to a low-jitter code rate control method for 4K / 8K ultra-high-definition video coding. Background technique [0002] With the rapid development of network communication and video processing technologies, technologies such as 4K, 8K and HDR (High Dynamic Range) have gradually become people's new requirements for visual experience. The data volume of 4K / 8K video is large, and the requirements for encoding and compression performance are relatively high. At present, the encoding and compression standards adopted for 4K / 8K video at home and abroad mainly include HEVC and AVS2. Their compression efficiency is high but the computational complexity is relatively large. However, 4K / 8K real-time live broadcast usually requires the speed of the encoder to reach more than 50 frames per second. Therefore, how to improve video output stability under certain network bandwidth and sp...
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IPC IPC(8): H04N19/177H04N19/184H04N19/42
CPCH04N19/177H04N19/184H04N19/42
Inventor 廖义谢亚光李日
Owner HANGZHOU ARCVIDEO TECHNOLOGY CO LTD