Due to the high bandwidth requirements and the long-lived nature of video

network bandwidth is proved to be the major limiting factor in the widespread usage of video streaming on demand over the Internet.Based on the existing network technologies and the capacity of clients and network

such as

I/O bandwidth

local cache

and a transmission scheme for proxy-based distributed video on demand was designed for the context of large-scale video on demand application.In each LAN there lies a proxy

which caches partial content of a part of video assets

admits and serves the request clients in a dynamically batched manner.Unicast alone will be used to transmit the video content on the network paths from the server to the proxy

while multicast or unicast can be chosen to transmit the video from the proxy to the clients.Experimental results have proved that the proposed scheme can greatly reduce the backbone bandwidth usage and provide theoretically null startup latency for clients.