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Proceedings Paper

Performance optimization of an MPEG-2 to MPEG-4 video transcoder
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Paper Abstract

The MPEG-2 compressed digital video content is being used in a number of products including the DVDs, Camcorders, digital TV, and HDTV. The ability to access this widely available MPEG-2 content on low-power end-user devices such as PDAs and mobile phones depends on effective techniques for transcoding the MPEG-2 content to a more appropriate, low bitrate, video format such as MPEG-4. In this paper we present the software and algorithmic optimizations performed in developing a real time MPEG-2 to MPEG-4 video transcoder. A brief overview of the transcoding architectures is also provided. The details of the transcoding architectures for MPEG-2 to MPEG-4 video transcoding can be found in. The transcoder was targeted and optimized for Windows PCs with the Intel Pentium-4 processors. The optimizations performed exploit the SIMD parallelism offered by the Intel Pentium-4 processors. The transcoder consists of two distinct components: the MPEG-2 video decoder and the MPEG-4 video transcoder. The MPEG-2 video decoder is based on the MPEG-2 Software Simulation Group’s reference implementation while MPEG-4 transcoder is developed from scratch with portions taken from the MOMUSYS implementation of the MPEG-4 video encoder. The optimizations include: 1) generic block-processing optimizations that affected both the MPEG-2 decoder and the MPEG-4 transcoder and 2) optimizations specific to the MPEG-2 video decoder and the MPEG-4 video transcoder. The optimizations resulted in significant improvements both in MPEG-2 decoding as well as the MPEG-4 transcoding. With optimizations, the total time spent by the transcoder was reduced by over 82% with MPEG-2 decoding reduced by over 56% and MPEG-4 transcoding reduced by over 86%.

Paper Details

Date Published: 21 April 2003
PDF: 10 pages
Proc. SPIE 5117, VLSI Circuits and Systems, (21 April 2003);
Show Author Affiliations
Hari Kalva, Mitsubishi Electric Research Labs. (United States)
Anthony Vetro, Mitsubishi Electric Research Labs. (United States)
Huifang Sun, Mitsubishi Electric Research Labs. (United States)

Published in SPIE Proceedings Vol. 5117:
VLSI Circuits and Systems
Jose Fco. Lopez; Juan A. Montiel-Nelson; Dimitris Pavlidis, Editor(s)

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