Computer networks (3rd ed.)
Communication and computing for distributed multimedia systems
Communication and computing for distributed multimedia systems
Practical loss-resilient codes
STOC '97 Proceedings of the twenty-ninth annual ACM symposium on Theory of computing
PODC '97 Proceedings of the sixteenth annual ACM symposium on Principles of distributed computing
Effective erasure codes for reliable computer communication protocols
ACM SIGCOMM Computer Communication Review
Digital compression for multimedia: principles and standards
Digital compression for multimedia: principles and standards
Experience with control mechanisms for packet video in the internet
ACM SIGCOMM Computer Communication Review
Video compression techniques
RMDP: an FEC-based reliable multicast protocol for wireless environments
ACM SIGMOBILE Mobile Computing and Communications Review
Concepts for Resource Reservation in Advance
Multimedia Tools and Applications
Performance Monitoring of a Wireless Campus Area Network
LCN '97 Proceedings of the 22nd Annual IEEE Conference on Local Computer Networks
Architektur von Rechensystemen, Systemarchitektur auf dem Weg ins 3. Jahrtausend: Neue Strukturen, Konzepte, Verfahren und Bewertungsmethoden - Vorträge der 15. GI/ITG-Fachtagung ARCS '99 und der APS'99 (Arbeitsplatzrechensysteme)
Priority encoding transmission
IEEE Transactions on Information Theory - Part 1
Survey of error recovery techniques for IP-based audio-visual multicast applications
IEEE Network: The Magazine of Global Internetworking
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Real-time video communication as a component of distributed multimedia systems for new evolving applications like video telefony and video-conferencing is strongly dependent on the quality of service provided by its communication support. Dependability attributes of the undelying communication system playing a predominant role with regard to the quality achievable from applications and users point of view. Especially video compression reduces data rates by removing the original redundancy of video sequencies but creates dependencies between data of different images enabling extensive error propagation. So real-time video communication becomes extremely sensitive to faulty transmitted, lost or too late arriving data. This dependability inherent for instance in most packet switching networks results in low video quality. In this paper we study video communication via best-effort networks, which present the actual communication infrastructure. First we illustrate the effect of transmission deficiencies on the visual quality of the received video. Then an analytical model of dependability is developed, which reflects the transmission of MPEG and H.261 coded video streams. We apply our model to compute appropriate or even optimal parameters for video encoders. Forward error control using error correcting codes provides the communication process with fault tolerance, which may improve the quality of video transmission by systematic redundancy. So we extend our model to determine the required level of redundancy. Finally we discuss further mechanisms of fault tolerance to achieve high video quality even in case of modest or even low quality of service delivered by communication systems.