We present our approach for the implementation of these synchronized data services, with emphasis on the issues of content synchronization and the optimization of data placement in the broadcast stream. It allows presentations generated in one conference room to be received in other conference rooms and at desktop computers. Real-time interaction is provided between the conference rooms. Desktop viewers can submit audio or text based questions. Interconnection is accomplished entirely via the corporate IP intranet.
Network congestion is prevented by restricting the total number of presentations and playbacks.
We address the issues of payload format and media control by describing two architectures that allow for MPEG-4 streaming. The use of VBR transport is generally considered to offer some potentially attractive advantages over more traditional CBR transport. Furthermore, these relative performance evaluations are generally not provided under comparable levels of network resource utilizations. The approach is an extension of a previously developed joint source-channel coding approach for VBR digital video transport on ATM networks. Our objective in this paper is to provide a common comparison framework for CBR and VBR video streams.