Share Email Print

Proceedings Paper

Measurement study of RealMedia streaming traffic
Author(s): Tianbo Kuang; Carey L. Williamson
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

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)

© SPIE. Terms of Use
Back to Top