對擴展視頻點播系統服務能力進行了研究。在所提出的ContribVoD 系統中，
通過用戶相互共享各自擁有的視頻數據，使服務器不再是視頻數據的唯一來源，從而可分散視頻服務器的負擔，提高系統的服務能力。系統通過優化查詢、數據傳輸動態監控及初始緩沖來保證用戶的播放質量，同時利用種子選擇策略來盡量避免遠程數據傳輸，減小主干網絡的負擔。仿真實驗顯示，系統的服務能力比基于C/S 模式的視頻點播系統有顯著提高。
關鍵詞：對等，視頻點播，流媒體，播放質量
Abstract:ContribVoD is a p2p approach to extend the ability of Video on Demand systems
to serve more users. In the proposed system users share with each other the media data obtained and the media server is no longer the only source to get data from, thereby, the load on the media server could be greatly alleviated and the overall system capacity increases and more users could be served. ContribVoD introduces efficient searching, data transfer dynamically monitoring and initial buffering to maintain a high quality of playback. Its provider selection policy helps to reduce the load of the underlying network by avoiding remote data transfer. Simulation results show that ContribVoD could greatly outperform the traditional C/S based VoD systems with respect to the amount of users could be served.
Key words: p2p,peer to peer, video on demand ,streaming media,QoS