Dynamic Adaptation in Distributed Multimedia Applications
نویسندگان
چکیده
In this report, we present a proxy-based framework for dynamic adaptation in distributed multimedia applications. This proxy can be con gured to perform adaptations of multimedia data in real time. Proxy adaptations can be used to manage QoS according to the resources of the underlying environment (capacity of the user terminal or of the network), or to personalize (or extend) the functions of the application. We present the motivations for this approach, the implementation of the framework (based on the Microsoft DirectShow environment) and a performance evaluation that demonstrates the e ectiveness of the approach. Key-words: Multimedia, Content Adaptation, Quality of Service (Qos), Transcoding. Adaptation dynamique dans les applications multimédia réparties Résumé : Ce rapport présente une architecture d'adaptation dynamique dans les applications multimédia réparties, basée sur l'utilisation de noeuds intermédiaire dans le réseau. Un proxy peut être con guré pour adapter les données multimédia en temps réel. Ces adaptations peuvent viser la gestion de la qualité de service selon la disponibilité des ressources de lénvironnement sous-jacent (les capacités des terminaux ou celles du réseau) ou pour personnaliser (ou étendre) les fonctions de l'application. Nous présentons les motivations de cette approche, l'implémentation de l'architecture et une évaluation de performance qui démontre la faisabilité de cette approche. Mots-clés : Multimédia, Adaptation, Qualité de service (Qos),Transcodage. Dynamic Adaptation in Distributed Multimedia Applications 3
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