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Streaming Media Caching with Transcoding-Enabled Proxies

Shen, Bo; Lee, Sung-Ju; Basu, Sujoy

HPL-2002-210R1

Keyword(s): proxy caching; streaming media caching; video transcoding

Abstract: We propose a transcoding-enabled streaming media caching system (TeC) along with a new set of caching strategies. Our system is designed for efficient delivery of rich media web contents to heterogeneous network environments and client capabilities. The proxies perform transcoding as well as caching in our system. This design choice allows content adaptation to be performed at the edges of the networks. Depending on the connection speed and processing capability of an end user, the proxy transcodes the requested (and possibly cached) video into an appropriate format and delivers it to the user. By serving the transcoded video directly from the proxy, we improve the cache performance. Performance evaluation via simulation is presented. Specifically, simulations using both synthesized traces and real traces derived from enterprise media server logs are conducted. Simulation results indicate that by incorporating transcoding capability at the network edges, the traffic to the content origin server is further reduced. Notes: Published in the proceedings of the 6th IASTED International Conference on Internet and Multimedia Systems and Applications, 12-14 August 2002, Kauai, Hawaii.

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