Description
Date depot: 1 janvier 1900
Titre: Distributed Video Processing
Directeur de thèse:
Jean-Louis ROUGIER (LTCI (EDMH))
Domaine scientifique: Sciences et technologies de l'information et de la communication
Thématique CNRS : Non defini
Resumé:
Nowadays video conferencing in enterprises is organized primarily using central Multipoint Control Unit. MCU is responsible for controlling the conference as well as for video mixing. MCUs are very expansive as they are usually designed in the form of specialized hardware. Software based MCUs do also exist but consume considerable resources, due to operations with media streams.
At the same time, so-called Overlay Network video distribution approaches have emerged in the past decade, with research on Application Layer Multicast and Peer-To-Peer. In the “overlay” approaches, content distribution is handled by cooperation between user equipment, without relying on network equipment (hence its designation). They have been introduced in particular for efficient video distribution over the Internet, bypassing current network limitations (e.g. lack of multicasting support and quality of service insurance). These fully distributed approaches have proven to be efficient and robust means for video distribution over the Internet. However, in the context of video conferencing, video mixing needs to be done at endpoints, which is currently not possible for most mobile terminals (smart phones, tablets). In other words, if the endpoint is not capable to mix several video streams due to hardware/software constraints, its user will not obtain modern telepresence experience.
So the problem considered is to deliver rich video experience, available today through dedicated MCUs, without using dedicated hardware and without overloading communications servers with media processing operations. In order to achieve this, we need to design a novel architecture for distributed video processing (mixing, trans-coding, trans-scaling) and distribution mechanisms. The concept is thus to go beyond the current overlay network approach (dedicated solely on distribution) by integrating the distributed processing aspect.
Doctorant.e: Sorokin Roman