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Efficient Inter-Prediction Transcoding Algorithm from H.264/AVC to HEVC

With the development of the High Efficiency Video Coding (HEVC) video compression standard, there is an urgent need for more research on video format transcoding from H.264/Advanced Video Coding (AVC) to HEVC. In this paper, we highlight the difference between the inter-prediction mechanisms of the two standards, and propose detailed steps to complete bit stream transcoding from H.264/AVC to HEVC. In the transcoding process, we use information extracted from the H.264/AVC decoder in conjunction with our proposed algorithm, called "merging smaller blocks into a larger one" (MSBLO), to accurately obtain information regarding the coding unit (CU) size and the motion vector (MV), along with the prediction mode of the prediction unit (PU). This ultimately reduces the computational complexity of the determination of the optimum inter-prediction mode in the transcoding process. Experimental results show that our proposed transcoding algorithm reduces the computational complexity of the current HEVC model by approximately 90% with a lower rate distortion loss of coding efficiency.