H264 three type rate control methods (CBR, VBR, CVBR)

The CBR (constant bit rate) is encoded in a constant bit rate. When the Motion occurs, since the code rate is constant, only the QP can reduce the size size, the image quality is deteriorated, and the image quality is still It is better, so the image quality is unstable. This algorithm gives priority consideration (bandwidth). This algorithm is also the most difficult algorithm of the yield rate, because when there is a Motion occur, it is assumed that the Motion occurs in the last frame of the code rate statistics window, resulting in the size of the frame to become large, resulting in statistics. More than the preset code rate, that is, the statistics per second is unreasonable, which should be a measure of a period of time, which will be more reasonable. Be VBR (Variable Bit Rate) dynamic bit rate, its yield rate can vary with the complexity of the image, so its coding efficiency is relatively high, and Mosaic is rarely encoded. The code rate control algorithm determines the bit rate used by the image content, the image content is relatively simple, and less code rate is allocated (seemed more appropriate), and the image content is complex, which is allocated, so that the quality, and Bring the bandwidth limit. This algorithm gives priority to image quality. Be CVBR (construined variablebit rat), which is more difficult to translate into Chinese, which is an improvement method of VBR. But what is Constrained to reflect? This algorithm corresponds to the Maximum bitrate constant or the average bitrate is constant. This method has the advantages of the above two methods: When the image content is stationary, the bandwidth is saved, and when there is a Motion, it is used to improve the image quality as much as possible using the previously saved bandwidth to achieve the purpose of simultaneous bandwidth and image quality. This method typically allows the user to enter the maximum code rate and the minimum rate, still, when the code rate is stable in the minimum rate, the symbol is greater than the minimum rate, but does not exceed the maximum yield rate. The ideal model is as follows: Ave (Average Bit Rate) reaches the set bit rate within a certain time range, but the local code rate peak can exceed the set code rate, the average code rate is constant.

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