Abstract
Video transcoding—where video is converted from one compressed format to another compressed format for adaptation of channel bandwidth or receiver or both—is a technique proposed to adaptively deliver video streams across heterogeneous networks. In general, video transcoding can be used for bit rate reduction, spatial resolution, and/or temporal resolution reduction as well as for video coding format conversion. This chapter focuses on block-based video transcoding techniques. Considering that the chrominance components can usually be handled similarly as the luminance components, this chapter discusses the processing techniques done on the luminance components of the video. Video transcoding techniques for bit rate reduction and corresponding architectures have been reviewed followed by the progress made in heterogeneous video transcoding, including spatial resolution reduction, motion vector reestimation after spatial and/or temporal resolution reduction, and the macroblock coding-type decision. The chapter also discusses bit rate control techniques in video transcoding and recent research activities on error resilient video transcoding for wireless video.
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