Code rate control method and code rate control device used for video coding
A bit rate control and video coding technology, applied in the field of video coding, can solve the problems of affecting image quality and affecting user experience
Inactive Publication Date: 2016-08-24
LETV HLDG BEIJING CO LTD +1
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At present, in video coding, there is no good method for how to accurately and effectively determine the quantization parameters of each frame for bit rate control. Due to the unreasonable setting of the number of bits occupied by video frames in coding, the quality of the image is affected. user experience
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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0039] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.
[0040] figure 2 It is a schematic flow chart of an embodiment of a fast bit rate control method for video coding according to an embodiment of the present invention, as figure 2 Shown:
[0041] Step 101, setting a target code rate B and a target frame rate F of a ...
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The invention discloses a code rate control method and a code rate control device used for video coding. The code rate control method is characterized in that a target code rate B and a target frame rate F of a video sequence are set; by starting from 0th video frame, ith video frames are sequentially coded until a last video frame of a video sequence is coded; when the coding of the ith video frames is completed, C(i) corresponding to the ith video frames is calculated; a quantization parameter QP (i+1) corresponding to an i+1 th video frame is predicted according to the C(i), and the coding of the i+1 th video frame is carried out by adopting the QP (i+1). The fast code rate control method and the fast code rate control device are advantageous in that the quantization parameter QP of the next video frame is predicted according to the calculation complexity parameter corresponding to the current video frame, and the coding of the next video frame is carried out, and therefore the bit numbers of the codes occupied by the video frames are reasonably distributed, the code rate of the video is controlled, the video watching quality is improved, the coding efficiency is improved, and the coding time is saved.
Description
technical field [0001] The present invention relates to the technical field of video coding, in particular to a code rate control method and device for video coding. Background technique [0002] For the HEVC video coding standard, it has higher compression performance than the H.264 and AVS video coding standards. Compared with the older generation coding standard H.264 and the AVS video coding standard, the computational complexity of HEVC is relatively greatly improved. Each pixel of an HEVC video image can reduce the redundancy of the pixel by predicting its associated pixel. The prediction technology of HEVC image video coding is divided into intra-prediction (Intra-prediction) and inter-frame prediction (Inter-prediction). Inter prediction is divided into forward prediction and bidirectional prediction according to the prediction direction. Such as figure 1 As shown, a frame image coded by intra-frame prediction is called an I (Intra) frame, a frame image coded by f...
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IPC IPC(8): H04N19/573H04N19/577H04N19/124H04N19/177H04N19/105
CPCH04N19/105H04N19/124H04N19/177H04N19/573H04N19/577
Inventor 蔡砚刚白茂生刘阳杨帆祁海魏伟
Owner LETV HLDG BEIJING CO LTD