New Rate Control Optimization Algorithm for HEVC Aiming at Discontinuous Scene

To combat with lagging rate control (RC) parameter setting in encoding video sequences with discontinuous scenes, a novel RC algorithm at group of picture (GOP) level is proposed for high efficiency video coding (HEVC) in this paper. Firstly, the variation of GOP is analyzed and used to detect the discontinuous scene. Then, a new bit allocation algorithm is presented by constructing the correlation between bit allocation for every GOP and the intensity of scene change. Finally, the impact of RC parameter updating at the frame level is investigated to obtain high accuracy of bit allocation for discontinuous scenes. Experimental results show that compared with the current RC algorithm for HEVC, the proposed algorithm can obtain better performances on purpose of reducing the fluctuation of peak-signal-to-noise-ratio and rate-distortion optimization with almost the same encoding complexity for HEVC. Key-words: High efficiency video coding, rate control, discontinuous scene, video quality fluctuation