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研究生:劉宗瑋
研究生(外文):LIU, TSUNG-WEI
論文名稱:基於分層視訊編碼之混合群播與單播品質最佳化系統
論文名稱(外文):Optimal QoE for Hybrid Unicast and Multicast Systems Based on Scalable Video Coding
指導教授:楊士萱楊士萱引用關係
指導教授(外文):YANG, SHIH-HSUAN
口試委員:楊士萱林鼎然張寶基郭天穎
口試委員(外文):YANG, SHIH-HSUANLIN, TING-LANCHANG, PAO-CHIKUO, TIEN-YING
口試日期:2019-07-04
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:資訊工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2019
畢業學年度:107
語文別:中文
論文頁數:70
中文關鍵詞:SHVCROUTEMPEG-DASH視訊串流自適性位元率決策
外文關鍵詞:SHVCROUTEMPEG-DASHvideo streamingadaptive bitrate strategy
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近年來線上影音平台開始提供即時視訊、隨選視訊、以及電視頻道跟播等多樣化服務,若是使用傳統的單播串流方式將會造成頻寬的浪費。本論文提出一套混合單播與群播的自適性串流系統,結合ROUTE (Real-time Object delivery over Unidirectional Transport)通訊協定與MPGE-DASH (Dynamic Adaptive Streaming over HTTP)通訊協定,以節省多人觀賞同一部影片的頻寬消耗;本研究也採用SHVC (Scalable High-efficiency Video Coding)分層視訊編碼以有效產製不同位元率的高品質視訊,並且依據視訊的位元率、PSNR以及伺服器頻寬大小等因素決定系統的QoE (Quality of Experience)函數。本論文提出的自適性演算法動態分配群播與單播使用者的位元率,在有限的頻寬下可以讓整體終端使用者獲得最佳的視訊體驗。實驗模擬的結果也顯示,相較於一般的頻寬分配演算法,本論文的所提構想在各個網路模型中都能有效提升系統的QoE,在混合群播與單播的結果顯示,在穩定模型、遞增模型、遞減模型中整體PSNR分別提升了0.79 dB、4.92 dB、7.88 dB,同時也減少了視訊品質的切換次數。
The video streaming platforms have recently evolved to provide diversified services, including live video, video on demand, and TV shows premiere. The traditional unicast method may cause a waste of bandwidth when many users watch the same video contents at the same time. In this study, we realized a hybrid unicast and multicast adaptive streaming system. The system uses ROUTE (Real-time Object delivery over Unidirectional Transport) combined with the MPEG-DASH (Dynamic Adaptive Streaming over HTTP) to simultaneously satisfy the needs of unicast and multicast users. We use the SHVC (Scalable High-efficiency Video Coding) to generate high-quality video of different bitrates. The QoE (Quality of Experience) function is measured by bitrate, PSNR, and server bandwidth. The proposed adaptive algorithm dynamically allocates the bitrates of unicast and multicast users and achieves optimal average viewing quality. Experimental results show that the proposed algorithm effectively improves the system’s QoE under various bandwidth models compared to the conventional method. In the hybrid multicast and unicast scenario, the PSNR for the stable, incremental, and decreasing bandwidth models are increased by 0.79 dB, 4.92 dB, and 7.88 dB, respectively. The average quality switching frequency of users is also decreased.
摘要 i
ABSTRACT ii
誌謝 iv
目錄 v
表目錄 vii
圖目錄 ix
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機與目的 3
1.3 章節提要 4
第二章 背景技術介紹 5
2.1 視訊編碼 5
2.1.1 MPEG視訊編碼標準 5
2.1.2 可適性視訊編碼 6
2.2 視訊串流 9
2.2.1 多媒體傳輸 9
2.2.2 自適性串流 11
2.2.3 群播與單播 16
2.2.4 ROUTE簡介 17
2.3 自適性串流系統與演算法文獻回顧 20
2.3.1 自適性串流系統文獻回顧 20
2.3.2 自適性串流演算法文獻回顧 22
第三章 混合群播與單播QoE最佳化演算法 27
3.1 系統架構與流程 27
3.1.1 系統架構 27
3.1.2 系統流程 28
3.2 品質最佳化分配演算法 30
3.2.1 系統頻寬消耗控制 30
3.2.2 系統品質最佳化分配 31
第四章 實驗結果與分析 36
4.1 實驗環境 36
4.1.1 環境簡介 36
4.1.2 網路模型 38
4.1.3 本論文使用之開源軟體 39
4.2 測試序列影片 40
4.3 只有單播之結果與分析 43
4.4 只有群播之結果與分析 53
4.5 混合群播和單播之結果與分析 57
第五章 結論與未來工作 65
參考文獻 67



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