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Proceedings Paper

Efficient implementation of a video transcoder
Author(s): Krishna Ratakonda
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Paper Abstract

Given a video stream encoded with a particular bit rate and compression scheme (C1), transcoding the video stream refers to the process of re-encoding the input compressed stream at a different bit rate and possibly with different spatial resolution, temporal resolution and compression scheme (C2). In this paper the special case of a transcoder which has a 4:2:2 format video stream as it's input and produces a 4:2:0 output stream at a lower bit rate is considered. Further more, it is assumed that both C1 and C2, like nearly all standard video compression algorithms, use 8 x 8 block DCT based compression. In this context, it will be shown how standard implementations of transcoders, as proposed by Ghanbari and others may be simplified to obtain a reduction in the transcoder implementation complexity. In particular the problem of simplifying the process of down conversion from 4:2:2 to 4:2:0, so that this process can take place directly in the DCT domain, will be addressed. The MPEG-2 video standard treats interlaced and progressive video differently for compression purposes; the proposed scheme is shown to be applicable to both cases. Simulation results show that this simplification does not result in performance degradation when compared with standard, high complexity implementations.

Paper Details

Date Published: 11 October 2000
PDF: 8 pages
Proc. SPIE 4210, Internet Multimedia Management Systems, (11 October 2000); doi: 10.1117/12.403794
Show Author Affiliations
Krishna Ratakonda, IBM Thomas J. Watson Research Ctr. (United States)

Published in SPIE Proceedings Vol. 4210:
Internet Multimedia Management Systems
John R. Smith; Chinh Le; Sethuraman Panchanathan; C.-C. Jay Kuo, Editor(s)

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