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Synchronization in Multimedia Data Retrieval

Outline. IntroductionArchitecture of Distributed Multimedia Information SystemsMultimedia Synchronization SchemeBuffer Control SystemSimulationConclusion. Abstract. Multiple medium streams synchronize in real time for multimedia applications based on broadband high-speed NetworksPresent synchr

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Synchronization in Multimedia Data Retrieval

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    1. Synchronization in Multimedia Data Retrieval INTERNATIONAL JOURNAL OF NETWORK MANAGEMENT, VOL. 7, 33–62 (1997) Speaker:Bei-Huang Chang

    2. Outline Introduction Architecture of Distributed Multimedia Information Systems Multimedia Synchronization Scheme Buffer Control System Simulation Conclusion

    3. Abstract Multiple medium streams synchronize in real time for multimedia applications based on broadband high-speed Networks Present synchronization scheme for DMIS without a global clock What’s Distributed multimedia information system? Integration audio,video,text or image originating from different servers(one server belong to one media-type) Interconnected by high-speed network Broadband network

    4. Introduction(1) Eliminate all delays and variation incurred between media stream transmission and presentation. Packetization delay Network access dealy Transmission delay Protocol processing delay Presentation delay Problem:It’s complicated when media data is from different source in the same presentation

    5. Introduction(2) Clock’s drift problem-buffer control Two type of media data: Continuous :time-dependent real-service:live video need fine-grain synchronization(lip-sync) Discrete:time-independent Text or graphic Need superior reliability Based above two types of media data Inter-media synchronization Intra-media synchronization

    6. Introduction(3) Several synchronization requirements to solve the media synchronization problem some tools to express complex temporal relationships Real-time communication protocols and operating system (provide scheduling) Efficient buffer management

    7. Architecture of Distributed Multimedia Information Systems Quality of service for media applications A set of parameters that characterize communication services(ex.network Qos parameters like bandwidth,delay,jitter) According to Qos requirement for various media,network can reserve rosource Traditional communication are designed for data transmission,not suitable for real-time requirement

    8. Multimedia Synchronization Scheme Concept Model Description of Media Synchronization Playout Schedule and Synchronization Buffer Configuration at the Client Side Determination of Control Time in Stored Data Retrieval Synchronization in DMIS

    9. Concept Model Description of Media Synchronization To satisfy temporal precedence relationships SIU(Synchronization information unit) Divide each media object into a sequence of subjects with it’s own sync interval Transmission of an object consists of a stream of SIU SIU’s sync interval number as packet header information Ex.lip-sync are divided by the same duration

    10. Concept Model Description of Media Synchronization OCPN(object composition Petri net) Defined by the tuple[T,P,A,M,D,R]

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