References of "Soldani, Cyril"
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See detailOptimisation des débits des couches d'une transmission vidéo multipoint avec une meilleure prise en compte du surcoût d'encodage
Soldani, Cyril ULg; Leduc, Guy ULg

in CFIP'2009 (2009, October 12)

In video stream transmission, one often proposes to solve the problem of the heterogeneity of the receivers by dividing the stream into several cumulative layers distributed over multicast transmission. A ... [more ▼]

In video stream transmission, one often proposes to solve the problem of the heterogeneity of the receivers by dividing the stream into several cumulative layers distributed over multicast transmission. A dynamic adaptation by the source of the number and size of layer bit-rates to the set of its receivers allows a better usage of the network resources. Efficient algorithms have been designed to do this adaptation. However, the encoding of a video stream in layers incurs an overhead relatively to the single-layer encoding of the same stream. A too naive modeling of this overhead causes a suboptimal allocation of bit-rate. We propose an improvement of the layer bit-rate adaptation algorithm by dynamic programming to take a finer overhead model and other encoder constraints into account. To this end, we introduce a more general overhead model. As our algorithm is of high complexity, we also present a heuristic allowing to find quickly a solution which is near the optimum and we test this heuristic by simulations based on our model. [less ▲]

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See detailMultiple Description Coding versus Transport Layer FEC for Resilient Video Transmission
Soldani, Cyril ULg; Verdicchio, Fabio; Leduc, Guy ULg et al

(2006, August)

Video content delivery is a challenging task due to its large bandwidth requirements and its sensitivity to transmission errors. In this context, simultaneously providing scalability and resilience ... [more ▼]

Video content delivery is a challenging task due to its large bandwidth requirements and its sensitivity to transmission errors. In this context, simultaneously providing scalability and resilience against transmission errors is of paramount importance. Layered video coding coupled with multicast video transmission employing no feedback provides the required scalability features and reduces the network burden. However, it is not easy to provide reliability in such environments. This is crucial to mobile users as error rates on wireless links can be high. To compensate for transmission errors, redundancy must be added to the video content. This can be added at the application layer by the employed video coding system, or can be added transparently by the transport layer. In this paper, we compare the performance obtained with a scalable wavelet-based video codec that adds redundancy using multiple description coding with the equivalent system adding redundancy at the transport level, using forward error correction. [less ▲]

Detailed reference viewed: 48 (5 ULg)