Dynamic Buffer Management for Near Video-On-Demand Systems

  • Authors:

  • Wen-Jiin Tsai;Suh-Yin Lee

  • Affiliations:

  • Department of Computer Science and Information Engineering, National Chiao Tung University, Hsinchu, Taiwan, R.O.C. E-mail: wjtsai@info1.csie.nctu.edu.tw;Department of Computer Science and Information Engineering, National Chiao Tung University, Hsinchu, Taiwan, R.O.C. E-mail: wjtsai@info1.csie.nctu.edu.tw

  • Venue:
  • Multimedia Tools and Applications
  • Year:
  • 1998

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Abstract

Advances in networking and storage technology have made it possibleto deliver on-demand services over networks such as the emergingvideo-on-demand (VOD) applications. A variety of studies have been focusedon designing a video server suitable for VOD applications. However, thenumber of concurrent on-demand services supported by the server is oftenlimited by the I/O bandwidth of the storage systems. This paper describes adiscrete buffer sharing model which uses batching and buffer sharingtechniques in video servers to support a large number of VOD services. Twooperations, splitting and merging, enable the model to fully utilize systemresources such as buffers and disk bandwidths. Moreover, this paper alsointroduces the concept of imprecise video viewing which assumes that alimited amount of quality loss is acceptable during video playback. Basedupon this assumption, three shrinking strategies are explored to reducebuffer requirements. Finally, the results of experiments show that ourmethods perform better than traditional buffer management techniques for VODsystems.