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Proceedings Paper

Performance of real-time software-only H.261 codec on the Power Macintosh
Author(s): Hsi-Jung Wu; Katherine S. Wang; James O. Normile; Dulce B. Ponceleon; Ken Chu; K. Sung
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Paper Abstract

The widespread use of teleconferencing as a major role of remote communication has until now been stymied by the costs associated with deploying specialized hardware required to achieve good performance. Another constraint has been the incompatibility among the various systems that are available. These facts coupled with the rapid increase in computational power available on desktop systems convinced us of the value of a standards-based software solution. Leveraging the performance of the PowerPC RISC processors, we have implemented a software-only realization of the CCITT H.261 video coding standard. In this paper, we will discuss the performance of the software codec which has been optimized for the Power Macintosh 8100. Over ISDN and loaded Ethernet, the codec provides good visual quality in terms of spatial quality and frame rate over a range of bit rates (less than 64 to 384 Kbits/s). We will outline the structure of the software codec and discuss its performance.

Paper Details

Date Published: 17 April 1995
PDF: 7 pages
Proc. SPIE 2419, Digital Video Compression: Algorithms and Technologies 1995, (17 April 1995); doi: 10.1117/12.206389
Show Author Affiliations
Hsi-Jung Wu, Apple Computer, Inc. (United States)
Katherine S. Wang, Apple Computer, Inc. (United States)
James O. Normile, Apple Computer, Inc. (United States)
Dulce B. Ponceleon, Apple Computer, Inc. (United States)
Ken Chu, Apple Computer, Inc. (United States)
K. Sung, Apple Computer, Inc. (United States)

Published in SPIE Proceedings Vol. 2419:
Digital Video Compression: Algorithms and Technologies 1995
Arturo A. Rodriguez; Robert J. Safranek; Edward J. Delp, Editor(s)

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