Proxy Caching and Video Segmentation Based on Request Frequencies and Access Costs

Abstract-Partial caching of large media objects such as video 6les has been proposed in men1 pmxy caching sch-, as the caching of entire videas can exhaust proxy storage resources within few requests. In this work the idea of segmenting videos inlo a nnm-ber d chunks and replacement decisions be taken at the chunk level rather than based on the entire objects is adopted. In particular a video segmentation scheme called Variable Chunk Size is presented. This scheme uses the request frequenck to dynamically adjust the sue of the chunk and it is shown to be capable of combining a high BHR with mall ".se time to demand changes. Video segmenta-tion is also considered as a mechanism to provide for caching diller. entialion based on access costs. By employing access cast dependent chunk sizes an oved acces cast reduction is demonstrated. 1