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<dc:subject xml:lang="fr">Vidéo</dc:subject>
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<dcterms:abstract xml:lang="fr">Les récents développements dans la communication vidéo ont conduit à l'introduction d'unités de transfert sélectif. Ces systèmes ont le potentiel d'améliorer considérablement l'efficacité et d'offrir de nouvelles fonctionnalités, mais ils présentent leurs propres défis, nécessitant de nouvelles approches et solutions. Cette thèse est dédiée à l'étude des systèmes SFU, avec pour objectif de les rendre plus efficaces. Nous commençons par le problème de l'efficacité et proposons un algorithme de sélection de point final basé sur l'activité de la parole. Ensuite, nous évaluons l'utilisation de la diffusion simultanée pour réduire davantage la bande passante requise. Ensuite, nous proposons une approche de serveur distribué dans le but d'améliorer la qualité de connexion des utilisateurs. Nous présentons une analyse, une implémentation et une expérience randomisée mesurant la qualité de la connexion. Enfin, nous proposons une extension pour les conférences chiffrées de bout en bout avec les SFU.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Recent developments in video communication led to the introduction of Selective Forwarding Units. These systems have the potential to significantly improve efficiency and offer new functionality, but they present challenges of their own, requiring new approaches and solutions. This thesis is dedicated to the study of SFU systems, with a focus on making them more efficient. We begin with the problem of efficiency and propose an algorithm for endpoint selection based on speech activity. Then we evaluate the use of simulcast for further lower the required bandwidth. Next, we propose a distributed server approach with the goals of improving user connection quality. We present an analysis, implementation, and a randomized experiment measuring connection quality. Finally we propose an extension for end-to-end encrypted conferences with SFUs.</dcterms:abstract>
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