News-Detailsicht

26.01.2012 15:20

26.1.2012, WA 73, 0446, 16:00

Quality Adaptation in P2P Video-on-Demand: Design, Performance, and Lessons Learned as part of the DFG Research Unit QuaP2P Prof. Dr.-Ing. Ralf Steinmetz Technische Universität Darmstadt

P2P Video-on-Demand (VoD) based on Scalable Video Coding (SVC) (the scalable extension of the H.264/AVC standard) is gaining momentum in the research community and industry as it enables elegant adaptation to the heterogeneity of user devices and network dynamics. However, some research questions remain open. For example, how does the design and adaptation algorithms affect the overall perceived performance for all users in the system? Also, how can the performance of an SVC-based VoD system be defined? This talk explores the major steps in building a quality adaptive P2P VoD streaming systems with focus on the impact and trade-offs of quality adaptation. We present lessons learned and performance of the designed system in terms of session quality (start-up delay, video stalls) and delivered SVC video quality (layer switches, received layers) and find out that these two metrics exhibit a trade-off.