Video compression code ratio control method using uneven distribution of frame target bit number

A target bit number, average distribution technology, applied in the multimedia field, can solve the problem of not considering the coding complexity of different P frames

Inactive Publication Date: 2007-02-07
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

[0004] Traditionally, the target bit allocation method for P frames in video frames is almost evenly distributed (only slightly adjusted according to the current storage capacity of the buffer), without considering the different encoding complexities of different P frames

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  • Video compression code ratio control method using uneven distribution of frame target bit number
  • Video compression code ratio control method using uneven distribution of frame target bit number
  • Video compression code ratio control method using uneven distribution of frame target bit number

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Embodiment Construction

[0055] In the video compression code rate control method proposed by the present invention, the target bit number of the P frame is distributed unevenly, which is an improvement to the traditional almost uniform distribution method. This method mainly carries out as follows:

[0056] During the actual implementation of rate control:

[0057] 1) Set the volume of the buffer at the encoding end, which can be set according to the actual application scenario; then set the initial storage capacity of the buffer to 20% of the buffer volume;

[0058] 2) Set the target number of bits B assigned to each GOP GOP , B GOP is set to N GOP ×R / F, where N GOP is the total number of frames in a GOP, R is the target transmission bit rate, and F is the output frame rate;

[0059] 3) When encoding the GOP, set the QP value of the first I frame in the GOP to the average QP value of all macroblocks in all P frames in the previous GOP;

[0060] 4) When encoding a GOP, for each P frame in the G...

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Abstract

The invention relates to a video compression code rate control method which uses non-uniform distribution of frame target bits, wherein it comprises: first, setting the video code buffer; then distributing bit for each GOP; then controlling the frame-jump on present coded P frames; distributing bits for present coded P frames. Said method con support different video compression standards as H.263, MPEG-4 and H.264; the applied video sequence mode is GOP mode; said code mode can be used in video detection and network TV, etc. Compared with traditional method, the invention is easy, with improved video quality and reduced quality fluctuation, while it can confirm the stability of buffer when switching views.

Description

technical field [0001] The invention relates to the field of multimedia technology related to video transmission control, in particular to a video compression code rate control method using uneven distribution of frame target bit numbers. Background technique [0002] In real-time video communication, the compressed video code stream needs to be transmitted on a complex network with different bandwidth requirements. In order to make the most efficient use of network resources at any time and ensure relatively high video image quality, it is necessary to control the bit rate of the video stream. If the code rate of the code stream generated after video encoding is too high, it will increase the transmission pressure of the network and cause network congestion; on the other hand, if the code rate decreases during the generation of the code stream, the quality of the video image will be reduced. And result in insufficient utilization of network bandwidth. Therefore, it is nec...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N19/105H04N19/184
Inventor 陈纯卜佳俊杨智莫林剑赵梦
Owner ZHEJIANG UNIV
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