Research Of Playback Technology Based On P2P Live Streaming Media

Based on P2P live streaming media technology can make full use of the rest of the node networkresources, reduce the pressure of the server, has the very high real-time, so it became one of the hot spot inthe research in recent years. And playback technology as streaming media key technology has been usedwidely in the unlive streaming media system. There is less research of Live streaming media playbacktechnology,and users’ demand to live streaming media playback is higher, so the live streaming mediaplayback technology has important theoretical and practical value.This paper opens up embedded study of the recent problems of Live streaming system structure andcaching algorithm can’t properly implemented the replay. The main research work has the following points.According to the present problem that playback video piece of copy can’t completely be find andmaintenance spending large in the live playback system based on structural P2P, this paper proposes amodel based on video pieces of structured query-DSL-DHT, in DSL-DHT, layering according to the firstvideo node cache, all the same node of the first video node cache form a layer. Node is classified intostrong node and layered node. Strong node is elected by nodes in layer, all registered information are instrong nodes, all routing information also completed in the layer nodes.The experimental results show that,compared with other system, DSL-DHT has higher cache shooting, good inquires performance and lowmaintenance costs.In view of the problem that the broadcast delay of video piece is larger in the current live streamingmedia, a dynamic buffer placed algorithm, an application of the P2P streaming media system, is putforward, a dynamic buffer algorithm calculate the physical distance between the nodes based on thephysical location of node, and put the node that nearest the inquiring node into request video layer, thendownload the resources, this will shorten the transmission path and reduce the broadcast delay.Combined live streaming media structure with caching algorithm, DSLSS,the prototype of livestreaming media based on P2P,which can effectively complete playback function of live streaming mediaand reduce the pressure of server and node is designed.The experimental results show that the pressure of the nodes and server is small during operation of the system，the system has a very good feasibility andexpansibility.