Conference Paper

A Fast Video Mixing Method for Multiparty Video Conference.

DOI: 10.1007/11559573_40 Conference: Image Analysis and Recognition, Second International Conference, ICIAR 2005, Toronto, Canada, September 28-30, 2005, Proceedings
Source: DBLP

ABSTRACT In this paper, we propose a fast video mixing method for reducing the computational complexity in the MCU (Multipoint Control
Unit) used in the video conferencing. The conventional mixing method is based on the pixel-domain transcoder, of which computational
complexity is linearly increased as the number of participants is increased. Basically the method requires many decoders and
one huge encoder to mix the multiple bitstreams. To reduce the computational complexity, we propose a hybrid mixing method
based on the syntax-based bitstream modification and pixel-domain transcoder. The proposed method reduces the computational
complexity about 45% at the improved quality, compared with the conventional mixing method based on the pixel-domain transcoder.

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    ABSTRACT: This paper proposes an endpoint video combiner architecture in a multipoint control unit (MCU) system for high definition multiparty video conferencing. The proposed architecture addresses the current reliability, computational and quality drawbacks of a conventional centralized based video combiner architecture. This is achieved by redesigning the MCU video to move away the video combiner from the bridge and into the client endpoints. Moreover, the proposed architecture represents a serverless system and is able to scale a large number of clients at high resolutions in a multipoint video conferencing session. In order to realize this design, this paper also proposes a custom robust sustainable session management protocol which allows a dynamic multi-port management between the MCU video and client endpoints. In addition, the proposed custom session management protocol includes recommendation for a session protection structure. Experimental results suggest that the proposed architecture exhibits significant computational frame rate performance gains of up to 762.95% in comparison with the conventional centralized video combiner architecture based on a series of four and eight high definition combined video assessments. Moreover, reliability analysis suggests that the proposed architecture is also able to consistently sustain a high frame rate performance within a long duration high definition multipoint video conferencing session.
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