Temporal Control Specifications and Mechanisms for Multimedia Multicast Communication Services
ICN '01 Proceedings of the First International Conference on Networking-Part 1
Real-time transmission of multilayer video over ATM networks
Computer Communications
Multipoint communications with speech mixing over IP network
Computer Communications
Performance Studies of Voice and Video Conferencing over ATM and Gigabit Ethernet Backbone Networks
International Journal of Technology Diffusion
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The Internet explosion is driving the need for new collaboration tools which will enable two or more users to share data, audio, and video. The real-time packet-based solutions which are emerging differ considerably from the circuit-switch solutions which have existed for some time now. In this paper, we present one such packet-based approach, the Multimedia Multiparty Teleconferencing (MMT) system, which was fully implemented as a research prototype. Using MMT as an example, we address some of the fundamental issues related to videoconferencing systems in a packet-based environment, and discuss the differences with the traditional circuit-switch approaches, namely, the ITU H.320 standard. In particular, MMT is a distributed solution, while H.320 is centralized. The use of multicast and a novel video-mixing technique to facilitate the distributed solution are presented. Furthermore, MMT audio and video streams are susceptible to congestion and packet loss in the shared media packet-based environment, while H.320 streams use dedicated connections. As such, synchronization, error resilience, and dynamic rate control schemes for the packet-based system are presented