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Proceedings Paper

Rate-controlled requantization transcoding for H.264/AVC video streams
Author(s): Stijn Notebaert; Jan De Cock; Peter Lambert; Rik Van de Walle
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Paper Abstract

Nowadays, most video material is coded using a non-scalable format. When transmitting these single-layer video bitstreams, there may be a problem for connection links with limited capacity. In order to solve this problem, requantization transcoding is often used. The requantization transcoder applies coarser quantization in order to reduce the amount of residual information in the compressed video bitstream. In this paper, we extend a requantization transcoder for H.264/AVC video bitstreams with a rate-control algorithm. A simple algorithm is proposed which limits the computational complexity. The bit allocation is based on the bit distribution in the original video bitstream. Using the bit budget and a linear model between rate and quantizer, the new quantizer is calculated. The target bit rate is attained with an average deviation lower than 6%, while the rate-distortion performance shows small improvements over transcoding without rate control.

Paper Details

Date Published: 15 September 2008
PDF: 12 pages
Proc. SPIE 7073, Applications of Digital Image Processing XXXI, 70730T (15 September 2008); doi: 10.1117/12.796405
Show Author Affiliations
Stijn Notebaert, Ghent Univ. (Belgium)
Jan De Cock, Ghent Univ. (Belgium)
Peter Lambert, Ghent Univ. (Belgium)
Rik Van de Walle, Ghent Univ. (Belgium)

Published in SPIE Proceedings Vol. 7073:
Applications of Digital Image Processing XXXI
Andrew G. Tescher, Editor(s)

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