Abstract
Efficient bitrate reduction of video content is necessary in order to satisfy the different constraints imposed by decoding devices and transmission networks. Requantization is a fast technique for bitrate reduction, and has been successfully applied for MPEG-2 bitstreams. Because of the newly introduced intra prediction in H.264/AVC, the existing techniques are rendered useless. In this paper we examine requantization transcoding of H.264/AVC bitstreams, focusing on the intra 4×4 prediction modes. Two architectures are proposed, one in the pixel domain and the other in the frequency domain, that compensate the drift introduced by the requantization of intra 4×4 predicted blocks. Experimental results show that these architectures perform approximately equally well as the full decode and recode architecture for low to medium bitrates. Because of the reduced computational complexity of these architectures, in particular the frequency-domain compensation architecture, they are highly suitable for real-time adaptation of video content.
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Notebaert, S., De Cock, J., De Wolf, K., Van de Walle, R. (2006). Requantization Transcoding of H.264/AVC Bitstreams for Intra 4×4 Prediction Modes. In: Zhuang, Y., Yang, SQ., Rui, Y., He, Q. (eds) Advances in Multimedia Information Processing - PCM 2006. PCM 2006. Lecture Notes in Computer Science, vol 4261. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11922162_92
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DOI: https://doi.org/10.1007/11922162_92
Publisher Name: Springer, Berlin, Heidelberg
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