Requantization transcoding of H.264/AVC bitstreams for intra 4×4 prediction modes

  • Authors:

  • Stijn Notebaert;Jan De Cock;Koen De Wolf;Rik Van de Walle

  • Affiliations:

  • Department of Electronics and Information Systems – Multimedia Lab, Ghent University – IBBT, Ledeberg-Ghent, Belgium;Department of Electronics and Information Systems – Multimedia Lab, Ghent University – IBBT, Ledeberg-Ghent, Belgium;Department of Electronics and Information Systems – Multimedia Lab, Ghent University – IBBT, Ledeberg-Ghent, Belgium;Department of Electronics and Information Systems – Multimedia Lab, Ghent University – IBBT, Ledeberg-Ghent, Belgium

  • Venue:
  • PCM'06 Proceedings of the 7th Pacific Rim conference on Advances in Multimedia Information Processing
  • Year:
  • 2006

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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.