Evaluation of Video Server Capacity with Regard to Quality of the Service in Interactive News-On-Demand Systems
A key issue in any system for distribution of continuous media-on-demand is the capacity of the system with regard to quality of the service specifications, that is, the number of simultaneous streams the system can provide until degradation of the quality of reproduction and interactivity perceived by the users. This work presents the evaluation of interactive video-on-demand systems, with special attention to limitations caused by the video server. The evaluation is based on a set of metrics designed to determine the number of streams a video server can support under specific requirements of the quality of the service as perceived by the users. To validate the utility of these metrics, a prototype of a news-on-demand service has been built and the load for this kind of systems has been characterised. In addition, a load generator which emulates the concurrent access of several users to the system has been built. The evaluation establishes the relationship between the video server limitations and the quality of the service perceived by the users.
KeywordsVideo Server News Item Video Packet Transmission Speed Multimedia Stream
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- 1.S. Acharya, B. Smith, and P. Parnes. Characterizing user access to videos on the world wide web. In ACM/SPIE Multimedia Computing and Networking, 1998. http://citeseer.nj.nec.com/acharya98experiment.html.
- 2.J.M. Almeida, J. Krueger, D.L. Eager, and M.K. Vernon. Analysis of educational media server workloads. In Workshop on Network and Operating System Support (NOSSDAV), 2001. http://citeseer.nj.nec.com/493220.html.
- 3.M. Buddhikot, G. Parulkar, and R. Gopalakrishnan. Scalable multimedia-on-demand via world-wideweb (www) with qos guarantees. In NOSSDAV, April 1996. http://citeseer.nj.nec.com/buddhikot96scalable.html.
- 4.M. Chesire, A. Wolman, G. Voelker, and H. Levy. Measurement and analysis of a streaming media workload. In USENIX Symposium on Internet Technologies and Systems (USITS), San Francisco, CA, USA, March 2001. http://citeseer.nj.nec.com/chesire01measurement.html.
- 5.British Broadcast Corporation. Bbc news-audiovideo section. News-on-demand service, 2002. http://news.bbc.co.uk.
- 6.Apple Computer Inc. Open source streaming server, 2002. http://www.publicsource.apple.com/projects/streaming/.
- 7.Imperial Technology Inc. Testing unix system performance. White paper, 2002. http://www.imperialtech.com/technology_whitepapers.htm.
- 8.S. Jin and A. Bestavros. A generator of internet streaming media objects and workloads. Technical report, Boston University. Computer Science Department, October 2001. http://citeseer.nj.nec.com/jin01generator.html.
- 9.Computer Journal. Continuous media on demand. Collection of Articles, September 2001.Google Scholar
- 10.K. Nahrstedt and R. Steinmetz. Resource management in networked multimedia systems. IEEE Computer, 28(5):52–63, 1995. http://citeseer.nj.nec.com/nahrstedt95resource.html.Google Scholar
- 11.J. Padhye and J. Kurose. An empirical study of client interactions with a continuous-media courseware server. In Workshop on Network and Operating System Support (NOSSDAV), 1998. http://citeseer.nj.nec.com/padhye97empirical.html.
- 12.R. Pradhan. Adaptive multimedia content delivery for scalable web servers. Master’s thesis, Worcester Polytechnic Institute, Computer Science Department, May 2001. http://www.cs.wpi.edu/~claypool/ms/web-load/.
- 13.L. Rojas-Córdenas, E. Chaput, L. Dairaine, P. Sónac, and M. Diaz. Transport of video over partial order connections. Computer Networks, 31(7):709–725, April 1999. http://citeseer.nj.nec.com/316559.html.
- 14.H. Schulzrinne, A. Rao, and R. Lanphier. Real time streaming protocol (rtsp). The Internet Society (RFC 2326), April1998. http://citeseer.nj.nec.com/schulzrinne98real.html.
- 15.T.P.J. To and B. Hamidzadeh. Interactive Video-On-Demand Systems. Kluwer, 1998.Google Scholar
- 17.Y. Wang, M. Claypool, and et al. An empirical study of realvideo performance across the internet. In ACM SIGCOMM Internet Measurement Workshop, 2001. http://citeseer.nj.nec.com/wang01empirical.html.
- 19.G.K. Zipf. The human behaviour and the principle of least effort. Addison Wesley, 1949.Google Scholar