Joint code rate control method and system supporting multimachine parallel coding
A technology of bit rate control and bit rate control model, applied in the direction of digital video signal modification, electrical components, image communication, etc., can solve the problems of reducing bit rate control performance, encoding information cannot be fed back immediately, etc., to achieve good bit rate control accuracy Effect
Active Publication Date: 2016-12-14
SHANGHAI JIAO TONG UNIV
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When parallel coding is introduced, multiple coding units may encode at the same time at the same time, resulting in that the coding information of the previous coding unit cannot be immediately fed back to the current coding unit to guide the setting of parameters, thereby reducing the performance of rate control. Therefore , the traditional rate control method must be redesigned to be suitable for the parallel coding framework
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[0023] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0024] Here, the present invention is applied to the code rate control of the x265 1.6 encoding framework, and the specific structure is as follows figure 1 As shown, after each frame of video enters the encoder, it will be spatially divided into several slices of the same size, each slice is sent to the encoder on each independent machine for encoding, and after encoding is completed, it is sent back to the host and merged into a complete video stream. During the encoding process, the joint code...
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The invention provides a joint code rate control method and system supporting multimachine parallel coding. A frame-level target bit is set according to a global target code rate, virtual buffer states and a frame type. Each frame is equally divided into multiple slices and then is distributed to multiple machines for coding. A chip-level target bit is set according to coding complexity of each slice. An appropriate lagrangian multiplier and quantization parameter are set according to target bits and a code rate control model, thereby realizing a code rate control function. According to the multimachine parallel coding based on video frame space division provided by the method and the system, under the condition that simultaneous coding of coders is kept, the global code rate control precision is effectively realized, and the method is a parallel and friendly code rate control method.
Description
technical field [0001] The invention relates to code rate control in the technical field of image processing, in particular to a joint code rate control method and system for multi-computer parallel coding. Background technique [0002] Video compression has brought various conveniences in life, work and entertainment to people today, such as videophone, video conferencing, high-definition TV and so on. Video compression relies on the rapid development of video coding technology in the past few decades. From the early H.261 to today's H.264 and HEVC, video coding technology has evolved from generation to generation, and the coding structure of the hybrid coding framework has been roughly established. . The evolution of various module technologies has greatly improved the performance of video encoding. The latest HEVC has achieved the requirement of 50% performance improvement compared with the previous generation encoder H.264. [0003] In all video coding technologies, bi...
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IPC IPC(8): H04N19/436H04N19/184H04N19/146H04N19/164H04N19/19
CPCH04N19/146H04N19/164H04N19/184H04N19/19H04N19/436
Inventor 宋利谢剑锋解蓉
Owner SHANGHAI JIAO TONG UNIV