Definition
A hierarchical Video-on-Demand system consists of the central server and several layers of proxy servers.
Hierarchical network architecture is one of the solutions for building a cost effective VoD system. Figure 1 shows the architecture of a hierarchical VoD system [1]. The central server has a large storage to store all available videos for the customers. The central server is connected to several proxy servers, which are physically located closer to the customers. Also the proxy servers are able to store a small portion of videos compared with the capacity of the central server. In a heterogeneous environment like Internet, layered encoded videos can be used to provide different quality of video streams. To serve the low bandwidth environment, the system simply transmits the base layer of the videos to provide the basic video quality. The quality can be increased with the enhancement layers of the videos if the customers subscribe the broadband service.
In a layered...
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References
W.F. Poon, K.T. Lo, and J. Feng, “Hierarchical Network Architecture for Layered Video Streaming,” Proceedings of 24th International Conference on Distributed Computing Systems Workshop, Tokyo, Japan, pp. 164–169, March 2004.
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© 2008 Springer-Verlag
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(2008). Hierarchical VoD System. In: Furht, B. (eds) Encyclopedia of Multimedia. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-78414-4_336
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DOI: https://doi.org/10.1007/978-0-387-78414-4_336
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