Rate control is an important tool in video coding. So far, R-λ based rate control algorithm for rate control is widely used in High Efficiency Video Coding (HEVC). In this paper, we present a survey on the algorithm of R-λ based rate control process, including bit allocation and rate control coding by parameters calculation. Firstly, we provide bit allocation method at three levels: group of pictures (GOP), frame, and basic unit level. Secondly, the methodologies of coding parameters calculation are presented. Then, we summarize the recent research achievements and future directions and finally open problems are discussed.
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