chapter15 - Introduction Characteristics of multimedia data...

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Unformatted text preview: Introduction Characteristics of multimedia data Quality of service management Resource management Stream adaptation Case study: the Tiger video file server Summary Chapter 15: Distributed Multimedia Systems Distributed multimedia applications Networked video library, Internet telephony, videoconference Characteristics of multimedia applications Timely delivery of streams of multimedia data to end-users Audio sample, video frame To meet the timing requirements QoS( quality of service) Characteristics of distributed multimedia applications Traditional real-time system E.g. avionics, air traffic control, telephone switching Small quantities of data, strict time requirement QoS management: fixed schedule that ensures worst- case requirements are always met Different requirements of multimedia app. General environment Compete with other distributed app. for network bandwidth, computing resource Dynamic resource requirements E.g. the number of participants of a video conference may vary User participant in the control of resource consumption QoS management Web-based multimedia Extensive buffering Best-effort Network phone and audio conference Relatively low bandwidth Efficient compression techniques High interactive latency Video-on-demand services Require sufficient dedicated network bandwidth Existing distributed multimedia Apps. without QoS Examples Videoconference (cooperative) Distributed online ensemble (synchronous) Requirements Low-latency communication round trip delays < 100 ms Synchronous distributed state If one user stops a video on a given frame, the other users should see it stopped at the same frame Media synchronization All participants in a music performance should hear the performance at approximately the same time External synchronization Sometime, other information need to be synchronized with the time- based multimedia streams Expecting rigorous QoS management Highly interactive applications A history of computer systems that support distributed data access The window of scarcity 1980 1990 remote login network file access high-quality audio interactive video insufficient resources scarce resources abundant resources 2000 Introduction Characteristics of multimedia data Quality of service management Resource management Stream adaptation Case study: the Tiger video file server Summary Chapter 15: Distributed Multimedia Systems Continuous Refer to the users view of the data Video: a image array is replaced 25 times per second Audio: the amplitude value is replaced 8000 times per second Time-based The delivery delay for each element is bounded in a value Bulky multimedia stream Data compression Reduce bandwidth requirements by factors between 10 and 100 E.g. GIF, TIFF, JPEG, MPEG-1, MPEG-2, MPEG-4 Characteristics of multimedia data...
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chapter15 - Introduction Characteristics of multimedia data...

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