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In this paper, we describe the design, implementation and evaluation for a multimedia conferencing system with intramedia and intermedia synchronization support between audio and video. The synchronization mechanism proposed here is capable of dynamically adapting to various network conditions thus providing an optimized QoS. In realizing the system based on this mechanism, NeVoT on Mbone is used for audio and VIC for video. Furthermore a synchronization controller is designed and realized with a unique process in supporting intermedia synchronization. Each media agents handling its media stream are modified with intramedia synchronization function. And a communicative function between media agents and synchronization controller is added as well for intermedia synchronization function. Each media agents function reports its buffering status to the synchronization control process which in turn send out optimized buffering delay value thus supporting intermedia synchronization. The realized system is configured and tested on Ethernet and ATM network where performance measurements were performed and its effective synchronization support has been assured.

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Abstract

Ⅰ. Introduction

Ⅱ. Intramedia and Intermedia Synchronization Mechanism

Ⅲ. Realization of the Conferencing Application with Synchronization Support

Ⅳ. The Performance Evaluation in Synchronized Multimedia Conferencing

Ⅴ. Conclusions

Acknowledgements

References

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UCI(KEPA) : I410-ECN-0101-2009-569-017764457