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Videoconferencing over packet-based networks
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DOI：10.1109/49.611162.png)
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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.
Keyword:
distributed MCU
packet video
rate control
videoconferencing
video mixing
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