多重描述編碼之同儕式隨選視訊串流設計與分析

在現行的網路傳輸中使用P2P (peer-to-peer) 的架構是非常流行與普及的，這種方式與傳統主從式(client-server) 架構相比，可以減少伺服器的負荷。而隨著多媒體的盛行，隨選視訊(video-on-demand , VoD) 系統使用P2P的架構也越來越多。在VoD系統中當有使用者要求視訊服務時，就要尋找到可提供要求服務的其他使用者來獲得服務，減少伺服器負荷。本研究提出將影片切割成若干片段後再經由 MDC (multiple description coding)技術將各片段切成若干等分，利用這樣二維度切割的前置處理去解決網路傳遞環境中容易發生的封包遺失問題，也可讓不同頻寬能力的使用者可以觀看影片。接著設計合適的存取機制，讓使用者在獲得服務後可以順利的觀看，並可以提供服務給其他使用者。最後經由模擬實驗結果觀察出，本論文提出的串流傳輸機制，適合在P2P的環境下，能有效的降低伺服器負荷。

關鍵字

P2P ；隨選視訊； VoD ；串流傳輸； MDC編碼；緩衝機制；快取機制

並列摘要

Of all the current network data transfer architectures, P2P architecture is one of the most popular architectures. It could reduce server loading compared to traditional client-server architecture. With prevalence of multimedia, more and more VoD (video-on-demand) systems are applied on P2P architectures. In this paper, we propose P2P streaming for multiple descriptions coding (MDC) video. The proposed method allows users with different bandwidths watching the same video. We first divide a video file into segments, and then divide those segments again by using MDC. Then, we design an adaptive access mechanism to make services not only available for users but also transferrable to another user. The simulation results indicate that the mechanism is suitable in P2P architecture. What’s more, the mechanism can significantly reduce the server load.

並列關鍵字

P2P ； VoD ； streaming ； MDC ； buffering ； caching

參考文獻

[4] 林朝興，徐維廷，鄭義繼，〝藉由平衡串流描述分佈與節點負擔提升同儕式網路串流效能〞，資訊科技國際期刊，October 2007, vol. 1, no. 1, pp. 67-81.

[1] Y. Huang, T. Z. J. Fu, D. M. Chiu, J. C. S. Lui ,and C. Huang, “Challenges, design and analysis of a large-scale P2P-VoD System,” in Proc. of ACM SIGCOMM’08, August 2008.

[2] C. Huang, J. Li, and K. W. Ross, “Can internet video-on-demand be profitable?,” in Proc. ACM SIGCOMM, Kyoto, Japan August 2007.

[6] L. Guo, S. Chen, and X. Zhang, “Design and evaluation of a scalable and reliable P2P assisted proxy for on-demand streaming media delivery,” IEEE Transactions on Knowledge and Data Engineering, May 2006, vol. 18, no. 5, pp. 669-682.

[7] T. T. Do, K. A. Hua, and M. A. Tantaoui, “P2VoD: Providing fault tolerant video-on-demand streaming in peer-to-peer environment,” in Proc. of IEEE ICC’04, June 2004, vol. 3, pp. 1467-1472.

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多重描述編碼之同儕式隨選視訊串流設計與分析

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