Rate Control Optimization of X265 Using Information from Quarter-Resolution Pre-Motion-Estimation

摘要

The rate control of x265 capitalizes on the low-resolution frame pre-motion-estimation to analyze the information prorogation in consecutive frames, with which to detect the scene cut, to decide the slice type, and to adjust the quantization ($Q$) offsets in coding-unit (CU)-level, respectively. In this paper, we increase the accuracy of the frame-level base$Q$calculation and the slice type decision in x265. We implemented the proposed algorithms in x265 version 2.4. Experiments revealed that, 0.5904dB BDPNSR on average and up to 1.7205dB coding quality improvement were achieved.