On the Performance of Networks Carrying Multimedia Traffic
The subject matter of this chapter is the performance of networks carrying multimedia traffic. The focus is particularly on audio/video traffic, since they constitute the types of media with the most stringent requirements, especially in terms of bandwidth and delay. The dependence of video traffic characteristics on the video encoding scheme and its control, as well as on the content, is illustrated by giving results for several example cases. The performance of Ethernets and ATM networks carrying video traffic is then addressed. The performance evaluation is undertaken by means of computer simulation, using real video sequences. All the delays in the system, starting with the camera, and ending with the display, are taken into account. Given the specific nature of the network considered and the maximum latency requirement, some data is lost. Loss of data at the receiver causes glitches in the display of video. The effect of data loss is thus measured in terms of the spatial extent, duration, and rate of glitches experienced as a function of the number of video streams, the delay requirement of the video application, and the video rate. Conversely, the performance of a network is measured in terms of the number of video streams that can be supported for a given maximum delay requirement and a given glitch rate, duration, and spatial extent.
KeywordsVideo Stream Video Quality Packet Loss Rate Discrete Cosine Transform Coefficient Video Traffic
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- İ. Dalgiç and F. A. Tobagi, “Constant Quality Video Encoding,” in IEEE ICC’95, (Seattle, Washington, USA), pp. 1255–1261, June 1995.Google Scholar
- İ. Dalgiç and F. A. Tobagi, “A Constant Quality MPEG-1 Video Encoding Scheme and its Traffic Characterization,” submitted to 1996 Picture Coding Symposium, Melbourne, Australia, March 1996.Google Scholar
- A. A. Webster, C. T. Jones, M. H. Pinson, S. D. Voran, and S. Wolf, “An Objective Video Quality Assessment System Based on Human Perception,” in SPIE Human Vision, Visual Processing, and Digital Display IV, vol. 1913, (San Jose, CA), pp. 15–26, Feb. 1993.Google Scholar
- “Video CODEC for Audiovisual Services at p×64 kbit/s,” ITU-T Recommendation H.261, (Geneva, 1990).Google Scholar
- “ISO/IEC JTC 1/SC 29, Coding of Moving Pictures and Associated Audio for Digital Storage Media at up to about 1.5 Mbits/s,” International Organization for Standardization (ISO), Nov. 1991.Google Scholar
- “Description of the Reference Model 8,” CCITT SG XV. Spec. Group on Coding for Visual Telephony, May 1989.Google Scholar
- G. F. Franklin, J. D. Powell, and M. L. Workman, Digital Control of Dynamic Systems (second edition). Addison-Wesley Publishing Company, 1990.Google Scholar
- “The PVRG H.261 encoder is available via anonymous ftp from have-fun.Stanford.EDU.”Google Scholar
- İ. Dalgiç, W. Chien, and F. A. Tobagi, “Evaluation of 10Base-T and 10Base-T E thernets Carrying Video, Audio and Data Traffic,” in IEEE INFOCOM’94, (Toronto, Canada), pp. 1094–1102, June 1994.Google Scholar
- F. A. Tobagi and İ. Dalgiç, “Evaluation of 10Base-T and 100Base-T Ethernets Carrying Constant Bit Rate Video Traffic,” submitted to IEEE JSAC, special issue on Distributed Multimedia Systems and Technology.Google Scholar
- F. A. Tobagi and N. Gonzalez-Cawley, “On CSMA-CD local networks and voice communication,” in Proceedings of the Conference on Computer Communications (IEEE Infocom), (Las Vegas, Nevada), pp. 122–127, IEEE, March/April 1982.Google Scholar
- İ. Dalgiç and F. A. Tobagi, “Glitches as a Measure of Video Quality Degradation Caused by Packet Loss,” submitted to 1996 Packet Video Workshop, Brisbane, Australia, March 1996.Google Scholar