This paper proposed a hybrid streaming distribution overlay,called P2Cloud, which supported P2P VoD service by introducing cloud technology with high reliability, storage, and processing ability. To address the key issue of P2Cloud-the video segment distribution, the segment usefulness considering popularity and peer effectiveness was introduced, it proposed a migrating policy according to the segment usefulness as well. And it proposed the formalized cost model of P2Cloud to guide the VoD service to reduce the deployment cost. The extensive simulation experiments validate that P2Cloud outperforms the existing solutions in term of the user' s satisfaction, bandwidth saving, bandwidth consumption.%提出一种新的流媒体分发混合网络模型P2Cloud,通过将云技术引入到P2P模式中,充分利用云技术的高可靠性、高存储及处理能力来协助P2P完成视频点播服务.针对P2Cloud模型的关键问题——视频片段的分布,引入数据片段有用值的概念,不但考虑到视频片段的流行度,同时考虑已加入节点的失效性,进而提出根据有用值来决定数据块向云平台的上传策略.并通过形式化的成本估算模型对P2Cloud点播应用成本进行量化,以指导点播服务提供商降低其部署成本.实验验证了提出的P2Cloud在用户满意度、带宽节约率及带宽消耗方面优于现有方案.
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