Due to the excellent compression and high real-time performance, x265 is widely used in practical applications. Combined with CU-tree based pre-analysis, x265 rate control can obtain high rate-distortion (R-D) performance. However, the pre-analysis information is not fully utilized, and the accuracy of rate control is not satisfactory in x265 because of an empirical linear model. In this paper, we propose an improved cost-guided rate control scheme for x265. Firstly, the pre-analysis information is further used to refine the bit allocation. Secondly, CU-tree is combined with the lambda-domain model for more accurate rate control and higher R-D performance. Experimental results show that compared with the original x265, our method can achieve 10.3\% BD-rate gain with only 0.22\textperthousand bitrate error.
翻译：由于压缩效果良好和实时性能高,x265在实际应用中被广泛使用。与基于CU-Tree的预先分析相结合,x265的费率控制可取得高率扭曲性(R-D)性能,但分析前的资料没有充分利用,由于经验线性模型,x265的费率控制准确性不令人满意。在本文件中,我们建议为x265改进成本指导费率控制计划。首先,分析前的资料被进一步用于改进比分分配。第二,CU-Tree与羊羔-Domain模型相结合,以进行更准确的费率控制和更高的R-D性能。实验结果表明,与原来的x265相比,我们的方法仅能达到10.3-BD率增幅,只有0.22的文本和比特率错误。
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