Abstract
In this paper, a novel method that utilizes the information of coding unit (CU) from source video to accelerate the downscale transcoding process for High Efficiency Video Coding (HEVC) is proposed. Specifically, the CU depth and prediction mode information are first extracted into matrices in block level according to the decoded source video. Then we use the matrices to predict CU depth and prediction mode at CU level in the target video. Finally, some effective rules are introduced to determine CU partition and prediction mode based on the prediction. Our approach supports the spatial downscale transcoding with any spatial resolution downscaling ratio. Experiments show that the proposed method can achieve an average time reduction of 59.3% compared to the reference HEVC encoder, with a relatively small Bjøntegaard Delta Bit rate (BDBR) increment on average. Moreover, our approach is also competitive compared to the state-of-the-art spatial resolution downscale transcoding methods for HEVC.
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This work was supported by National Natural Foundation of China under contract No. 61671025
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Huang, Z., Li, Y., Sun, J. (2020). Efficient HEVC Downscale Transcoding Based on Coding Unit Information Mapping. In: Ro, Y., et al. MultiMedia Modeling. MMM 2020. Lecture Notes in Computer Science(), vol 11961. Springer, Cham. https://doi.org/10.1007/978-3-030-37731-1_41
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