摘 要
可擴展高效率視訊編碼（Scalable High-Efficiency Video Coding, SHVC）最大的特色在於能支援多層的視訊解析度、畫面更新率和畫面品質，使不同的接收者能依據本身條件和需求，來播放不同位元之視訊串流；可擴展高效率視訊編碼可以有效的提升視訊可擴展性，相對的運算複雜度也大幅增加。此外，可擴展高效率視訊編碼相關編解器及播放器設計較為複雜，導致支援可擴展高效率視訊編碼影片的硬體播放裝置並不普及。本論文主要針對可擴展高效率視訊編碼，探討網路頻寬擁塞時所導致的視訊傳輸品質不佳狀況，並發展基於時間空間可調性之可擴展高效率視訊編碼自適應串流傳輸演算法，進行效能改進。實驗結果顯示本論文所提之時間空間可調演算法可隨影片性質動態調整傳輸視訊幀，可以提供給使用者更好的影片觀賞品質。
關鍵詞：可擴展高效率視訊編碼（SHVC）、高效率視訊編碼（HEVC）
Abstract
Scalable High-Efficiency Video Coding (SHVC) can support multi-layer video encoding, including temporal scalability, spatial scalability and quality scalability; Different receivers can play different videos based on their own conditions and needs, i.e., network conditions and quality requirements. SHVC can effectively improve video scalability, however, the relative computational complexity is also greatly increased. In addition, the design of encoders and players related to SHVC is relatively complex, resulting in the fact that hardware playback devices that support soft-scalable high-efficiency video coding videos are not popular. The goal of this paper is to investigate the coding efficiency of existing SHVC codecs and the compatibility of SHVC encoded videos, discusses the poor quality of video transmission caused by network bandwidth congestion, and develops adaptive streaming of scalable high-efficiency video coding based on temporal and spatial transmission adjustment algorithm to enhance the user watching experience. Experimental results show that the proposed temporal and spatial adjustment algorithm can dynamically adjust the transmission video frame according to the network conditions, which can provide users with better video viewing quality.
Keywords: Scalable High-Efficiency Video Coding(SHVC), High Efficiency Video Coding(HEVC)