In this paper we study the key issues of the real-time video transfer system when applying multicast technology.First we introduce an application-level high-performance multicast transport protocol RTMTP to offer guarantees of real-time and stable video transmission.Second,we improve the management of flow control by adding the component Video Repeater,avoiding the traditional way in which centralized and inflexible methods are applied.Third,packet forwarding is achieved through hierarchical service control of Repeaters.Finally,the implementation of a solution is issued and the performance of a sample system based on it is tested.
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