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Proceedings Paper

Measurement study of RealMedia streaming traffic
Author(s): Tianbo Kuang; Carey L. Williamson
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Paper Abstract

With the growing popularity of real-time audio/video streaming applications on the Internet, it is important to study the traffic characteristics of such applications and to understand their implications on network performance. In this paper, we present a measurement study of RealMedia streaming traffic, where the focus is both on the application-layer view (i.e., the output of the audio/video encoder) and on the network-layer view (i.e., the departure process for network packets emanating from the RealMedia server). Our main observation is that, although RealVideo can be compressed as Variable-Bit-Rate (VBR) at the application layer, it is often streamed as Constant-Bit-Rate (CBR) at the network layer. The audio and video streams have a hierarchical traffic structure: at large time scales (minutes), the overall bit rate is constant; at medium time scales (seconds), the packets have an on and off pattern due to the interleaving of audio and video; at fine-grain time scales (sub-second), back-to-back packet trains of two or more packets are often seen. We also note that most CBR-coded RealVideo streams are not long-range dependent (LRD). We attribute this difference to the CBR nature of the coder, which dynamically changes the video frame rate to keep the Internet traffic demands near-CBR over moderate time scales.

Paper Details

Date Published: 1 July 2002
PDF: 12 pages
Proc. SPIE 4865, Internet Performance and Control of Network Systems III, (1 July 2002); doi: 10.1117/12.473407
Show Author Affiliations
Tianbo Kuang, Univ. of Calgary (Canada)
Carey L. Williamson, Univ. of Calgary (Canada)

Published in SPIE Proceedings Vol. 4865:
Internet Performance and Control of Network Systems III
Robert D. van der Mei; Frank Huebner, Editor(s)

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