An analytical design of optimal playout schedulers for packet video receivers

Authors:
Nikolaos Laoutaris;Ioannis Stavrakakis
Affiliations:
Department of Informatics and Telecommunications, University of Athens, 15784 Athens, Greece;Department of Informatics and Telecommunications, University of Athens, 15784 Athens, Greece
Venue:
Computer Communications
Year:
2003

Citing 8
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Optimization of a packet video receiver under different levels of delay jitter: an analytical approach

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Abstract

One way to reduce, or avoid, the loss of intrastream synchronization due to the delay variability introduced by best-effort networks, is by employing application layer buffering and scheduling at a packet video receiver (PVR), resulting in a higher end-to-end delay. In this paper, an analytical model is presented that captures the essential tradeoff between stream continuity and stream latency. Unlike past related work, stream continuity is not expressed as the average amount of synchronization loss, but as a combination of the average amount, and the variability of the duration of synchronization loss occurrences. This approach allows for a fine grained optimization of stream continuity which has the potential of providing an improved perceptual quality. It is shown that the minimization of the average amount of synchronization loss, and the minimization of the variability of the duration of synchronization loss occurrences, are two competing objectives; the minimization of variability is desirable because it can lead to the concealment of discontinuities. The aforementioned presentation quality metrics are considered by the optimal playout policy, which is derived by means of Markov decision theory.