caa a22 4500 445297077 CHVBK 20180317142545.0 cr unu---uuuuu 170323e20100201xx s 000 0 eng 10.1007/s12243-009-0152-8 doi (NATIONALLICENCE)springer-10.1007/s12243-009-0152-8 Optimal server bandwidth for mobile video on demand [Elektronische Daten] [Shelley Buchinger, Helmut Hlavacs] Multimedia services such as video-on-demand or Internet protocol television in mobile environments have established themselves in our daily lives, yet the obtained quality of service still leads to many open issues. One of them consists in minimizing the server bandwidth, and we recently proposed a novel patching scheme for transporting true video-on-demand called Hierarchical Patching, which minimizes the server bandwidth. In this paper, we present a new concept called Low Start, consisting of encoding the first part of a movie with a lower bitrate than the rest. In Hierarchical Patching, video parts at the beginning have a much higher probability to be transmitted than parts at the end. By using Low Start, we show that the overall server bandwidth can be drastically reduced. We furthermore investigate the impact of Low Start on the subjective quality of service as perceived by human observers, and show that, for mobile video, the optimal strategy is to encode a very short start time with a bandwidth as low as possible. Institut TELECOM and Springer-Verlag, 2009 Batching nationallicence Server bandwidth nationallicence True video-on-demand nationallicence Video patching nationallicence Buchinger Shelley Institute of Distributed and Multimedia Systems, Faculty of Computer Science, University of Vienna, Lenaugasse 2, 1080, Wien, Austria aut Hlavacs Helmut Institute of Distributed and Multimedia Systems, Faculty of Computer Science, University of Vienna, Lenaugasse 2, 1080, Wien, Austria aut annals of telecommunications - annales des télécommunications Springer-Verlag 65/1-2(2010-02-01), 31-46 0003-4347 65:1-2<31 2010 65 12243 https://doi.org/10.1007/s12243-009-0152-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12243-009-0152-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Buchinger Shelley Institute of Distributed and Multimedia Systems, Faculty of Computer Science, University of Vienna, Lenaugasse 2, 1080, Wien, Austria aut NATIONALLICENCE 700 1- Hlavacs Helmut Institute of Distributed and Multimedia Systems, Faculty of Computer Science, University of Vienna, Lenaugasse 2, 1080, Wien, Austria aut NATIONALLICENCE 773 0- annals of telecommunications - annales des télécommunications Springer-Verlag 65/1-2(2010-02-01), 31-46 0003-4347 65:1-2<31 2010 65 12243 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer