Offensive and Defensive Adaptation in Distributed Multimedia Systems

Roland Tusch1, László Böszörményi1, Balázs Goldschmidt2, Hermann Hellwagner1 and Peter Schojer1

  1. Institute of Information Technology, Klagenfurt University
    Klagenfurt, Austria
  2. Department of Control Engineering and Information Technology, Budapest University of Technology and Economics
    Budapest, Hungary


Adaptation in multimedia systems is usually restricted to defensive, reactive media adaptation (often called stream-level adaptation). We argue that offensive, proactive, system-level adaptation deserves not less attention. If a distributed multimedia system cares for overall, end-to-end quality of service then it should provide a meaningful combination of both.
We introduce an adaptive multimedia server (ADMS) and a supporting middleware which implement offensive adaptation based on a lean, flexible architecture. The measured costs and benefits of the offensive adaptation process are presented.
We introduce an intelligent video proxy (QBIX), which implements defensive adaptation. The cost/benefit measurements of QBIX are presented elsewhere [1].
We show the benefits of the integration of QBIX in ADMS. Offensive adaptation is used to find an optimal, user-friendly configuration dynamically for ADMS, and defensive adaptation is added to take usage environment (network and terminal) constraints into account.

Key words

stream-level adaptation, server-level adaptation, MPEG-4, MPEG-7, MPEG-21

Publication information

Volume 1, Issue 1 (February 2004)
Year of Publication: 2004
ISSN: 1820-0214 (Print) 2406-1018 (Online)
Publisher: ComSIS Consortium

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How to cite

Tusch, R., Böszörményi, L., Goldschmidt, B., Hellwagner, H., Schojer, P.: Offensive and Defensive Adaptation in Distributed Multimedia Systems. Computer Science and Information Systems, Vol. 1, No. 1, 45-73. (2004)