A Fast PU Mode Decision Algorithm for H.264/AVC to HEVC Transcoding
Jiunn-Tsair Fang, Zong-Yi Chen, Tsai-Ling Liao, Pao‐Chi Chang · 2014
H.264/AVC has been widely applied to various applications.However, a new video compression standard, High Efficient Video Coding (HEVC), had been finalized recently.In this work, a fast transcoder from H.264/AVC to HEVC is proposed.The proposed algorithm includes the fast prediction unit (PU) decision and the fast motion estimation.With the strong relation between H.264/AVC and HEVC, the motion vectors (MVs), residuals, and modes from each coding block of H.264/AVC can be reused to predict the current encoding PU of HEVC.Furthermore, the MV variance from H.264/AVC is calculated to decide the search range of PU and also to reduce the prediction mode.Simulation results show that the proposed method can save up to 53% of the encoding time and maintains the rate-distortion (R-D) performance for HEVC.