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Most traditional Video-On-Demand (VoD) systems prefers multimedia streaming which increases server load.In this work, the server load can be minimized by using peer-to-peer network with caching and replication. In P2P network, besides the server responding to the user request, any peer having the requested content can also serve the user. Efficient caching and replacement of cached segment is implemented to satisfy more number of requests. The proposed system focuses on Hybrid caching which includes Cache Prefetching and Opportunistic Cache Update. In the dynamic network scenario, having frequent peer departures, huge data cached on peers turns unavailable. So efficient data sharing becomes complicated and again results in increased server load. In order to reduce the server load, the cached data can be replicated amongthe nodes in peer-peer network.

In this paper, we present a dynamic caching and replacing mechanism for the multiple videos over quality of service networks. The metafile containing the metadata about the video is maintained for caching and replacing mechanism. The caching algorithm employs the sliding window method to select the frame that has to be cached. The sliding window mechanism uses the beneficial value which is calculated based on the required bandwidth and buffer size of the frames. The experimental results shows the ordering of frames in the metafile and the influence of the window size for selecting the frame for caching.