Joint source/FEC rate selection for quality-optimal MPEG-2 videodelivery
Frossard, P.; Verscheure, O.
Image Processing, IEEE Transactions on
Volume 10, Issue 12, Dec 2001 Page(s):1815 - 1825
Digital Object Identifier 10.1109/83.974566
Summary:This paper deals with the optimal allocation of MPEG-2 encoding
and media-independent forward error correction (FEC) rates under a total
given bandwidth. The optimality is defined in terms of minimum
perceptual 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 (PLR) and the average burst
length after FEC decoding. We then show that the perceptual source
distortion decreases exponentially with the increasing MPEG-2 source
rate. We also demonstrate that the perceptual distortion due to data
loss is 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 scheme, thanks to its adaptivity to the scene complexity, the
available bandwidth and to the network performance. Furthermore, our
approach holds for any standard video compression algorithms (i.e.,
MPEG-x, H.26x)
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