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Perfect requantization for video transcoding

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Abstract

Bit rate adaptation is one of the most important types of video transcoding. In this paper, we investigate certain critical points in the spectrum of rate shaping requests. We show that the selection of quantization step sizes may not have monotonic effects on rate-distortion characteristics in the transcoding sense. In other words, rate-distortion tradeoff for transcoding which operates on an already-compressed source can be different than that for regular encoding which operates on an original source. We show in a generic form that careful selections of the step size can lead to much improved performance for transcoding, especially when comparing to what would have been produced through a direct encoding. We demonstrate this unique rate-distortion characteristic through simulations as well as real transcoding scenario with H.264 sequences.

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Authors and Affiliations

  1. Hewlett-Packard Laboratories, 1501 Page Mill Rd. 1181, Palo Alto, CA, 94304, USA

    Bo Shen

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  1. Bo Shen
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Correspondence to Bo Shen.

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Shen, B. Perfect requantization for video transcoding. Multimed Tools Appl 35, 163–173 (2007). https://doi.org/10.1007/s11042-007-0127-6

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  • DOI: https://doi.org/10.1007/s11042-007-0127-6

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