博碩士論文 etd-0630110-154256 詳細資訊


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姓名 王彥翔(Yan-hsiang Wang) 電子郵件信箱 E-mail 資料不公開
畢業系所 電機工程學系研究所(Electrical Engineering)
畢業學位 碩士(Master) 畢業時期 98學年第2學期
論文名稱(中) 在P2P串流網路中針對SVC影音片段的動態層級配置
論文名稱(英) Dynamic Layer Allocation for SVC Video Segments in P2P Streaming Networks
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    摘要(中) 本論文針對P2P影音串流網路提出兩種層級配置演算法,因應網路頻寬的變動以調整SVC (Scalable Video Coding)編碼技術的影像片段(Video Segment或VS)的層級數(layer),第一種配置法為週期性層級配置(Periodical Layer Allocation或PLA)演算法,週期性量測可用頻寬大小,根據可用頻寬調整到所能支持的層級數,但是在可用頻寬劇烈變化的環境中,PLA會使得影片的畫面品質產生劇烈的變化,使用者會因畫面品質的急遽變化而感到不適,並且週期性量測可用頻寬也需花費不小的代價。因此,我們提出第二種配置法為動態層級配置(Dynamic Layer Allocation或DLA)演算法,動態改變再度調整層級數的時間區隔(interval),若在interval內發生停頓或buffer可用空間無法存放影像片段的情況,則會縮短interval,當再度調整層數的時間到達時,則根據buffer中影像片段可播放時間的長短來估測可用頻寬的大小,我們在DLA以緩慢的方式調整層級數,相較於PLA,DLA可以讓畫面品質呈現較和緩的變化,使用者觀賞影片較為舒適。
    我們以C++自行撰寫模擬器,在可用頻寬劇烈變化和可用頻寬緩慢變化下進行模擬,從結果發現,在可用頻寬緩慢變化時,PLA與DLA的各項效能表現相差不多,但是在可用頻寬劇烈變化時,DLA可以使畫面品質的變動較為和緩,並且大量減少影像停頓的時間,使影片的播放較為順暢。
    摘要(英) In this paper, we propose two schemes for layer allocations to adjust the number of layers of SVC (Scalable Video Coding) segments according to the bandwidth variation in P2P video streaming networks. The first scheme is Periodical Layer Allocation (PLA) that can adjust the number of layers to fully satisfy the available bandwidth measured periodically. However, when the available bandwidth is changed abruptly, two major drawbacks may be occurred by PLA algorithm; first, the quality of video frames may become unsmooth so that users would feel uncomfortable about the picture quality, and second, the cost is increased due to the periodical measurement of the available bandwidth. Therefore, we propose Dynamic Layer Allocation (DLA), to dynamically change the time interval for adjusting SVC layers. When freeze-up occurred or when there was not enough buffer space to store the video segments during the interval, the interval would be reduced. When the interval for adjusting SVC layers was expired, available bandwidth can be determined by the number of video segments waiting in the buffer. Compared with PLA, DLA adjusts the SVC layers gracefully so that the quality of picture becomes smoother and users feel more comfortable while watching the film.
    We built a simulator written in C++ under two scenarios: the available bandwidth is changed abruptly and the one changed gradually. Simulation results show that the performance of PLA is quite similar to DLA when the available bandwidth is changed gradually. However, when the available bandwidth is changed abruptly, DLA can not only obtain the smoother video film but also decrease the freeze-up time significantly.
    關鍵字(中)
  • P2P串流網路
  • 影像片段
  • 動態層級配置
  • 影像停頓
  • 關鍵字(英)
  • Dynamic Layer Allocation
  • Buffer
  • Freeze-up
  • SVC
  • Video Segment
  • P2P Streaming Network
  • 論文目次 第一章 導論 1
    1.1研究動機 1
    1.2 SVC-BASED P2P VIDEO STREAMING 2
    1.3 研究方法 3
    1.4 章節介紹 4
    第二章 P2P網路的影音片段配置 5
    2.1 影音串流技術 5
    2.1.1 Client-Server架構 5
    2.1.2 P2P架構 6
    2.2 SVC與相關技術 8
    2.3 SVC的SEGMENT ALLOCATION相關研究 11
    2.3.1 P2P網路的Segment分佈 11
    2.3.2 P2P網路的Buffer Management 12
    2.3.3配置Segment的SVC Layer數 13
    2.4 本論文的影音片段的動態層級配置法 15
    第三章 SVC影音片段的動態層級配置 16
    3.1 SVC與P2P 16
    3.2 動態層級配置演算法 17
    3.2.1 PLA:根據可用頻寬調整SVC Layer數目 19
    3.2.2 DLA:根據VSwaiting數量來調整SVC Layer數目 21
    第四章 模擬機制與結果分析 26
    4.1 模擬環境與參數設定 26
    4.2結果分析 28
    4.2.1 AB劇烈變化之結果 28
    4.2.2 AB緩慢變化之結果 33
    第五章 結論與未來工作 39
    5.1結論 39
    5.2 未來工作 40
    參考文獻(REFERENCES) 42
    ACRONYMS 46
    索引 (INDEX) 47
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    [23] Y. Guo, C. Liang, and Y. Liu, “AQCS: Adaptive queue-based chunk scheduling for P2P live streaming,” IFIP-TC6 7th International Conference on Networking, May 5-9, 2008.
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    [25] S. Yu, R. Liao, J. Zhou, and J. Yu, “Differential Media Delivering Strategy for Loss Tolerant Streaming,” ISECS International Colloquium on Computing, Communication, Control, and Management, August 3-4, 2008.
    [26] Y. He, G. Shen, Y. Xiong, and Ling Guan, “Optimal Prefetching Scheme in P2P VoD Applications With Guided Seeks,” IEEE Transactions on Multimedia, Vol. 11, Issue 1, Page(s): 138-151, January 2009.
    [27] H. Sohn, H. Yoo, Y. B. Lee, C. S. Kim, W. D. Neve, and Y. M. Ro, “MPEG-21-Based Scalable Bitstream Adaptation using Medium Grain Scalability,” IEEE Region 10 Conference, November 19-21, 2008.
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  • 口試日期 2010-06-24 繳交日期 2010-06-30

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