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Joint Source/FEC Rate Selection for Optimal MPEG-2 Video Delivery.
Proceedings of the IEEE ICME Conference, NY, July 2000.
This paper deals with the optimal allocation of MPEG-2 encoding and media-independent
FEC rates under a total given bandwidth. The optimality is defined in
terms of minimum perceptual end-to-end distortion given a set of video
and network parameters. We first derive the set of equations leading to
the residual loss process parameters. That is, the packet loss ratio and
the average burst length after FEC decoding. We then show that the perceptual
source distortion decreases exponentially with the MPEG-2 source rate.
We also demonstrate that the perceptual distortion due to data lossis
directly proportional to the number of lost macroblocks, and therefore
decreases with the amount of channel protection. Finally, we derive the
global set of equations that lead to the optimal dynamic rate allocation.
The optimal distribution is shown to outperform classical FEC schemes,
thanks to its adaptivity to the scene complexity, to the available bandwidth
and to the network conditions.
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