Tag Archives: adaptation

Soutenance d’Habilitation à Diriger des Recherches

C’est avec plaisir que je vous annonce que je présenterai mes travaux de recherche sur le thème de “Interactive Media Streaming” dans le cadre la soutenance pour obtenir l’Habilitation à Diriger des Recherches de l’Université Pierre et Marie Curie de Paris. Cette présentation se déroulera:

Mardi 25 octobre 2016 à 14:00
à Télécom ParisTech (46 rue Barrault, Paris 13e)
Amphithéâtre Rubis

Le jury sera composé de:

M. Vincent CHARVILLAT, Professeur, Université de Toulouse, Rapporteur
M. Dick BULTERMAN, Professeur, Vrije Universiteit Amsterdam, Rapporteur
M. Carsten GRIWODZ, Professeur, Universitetet i Oslo, Rapporteur
M. Pierre SENS, Professeur, Université Paris 6, Examinateur
M. Gwendal SIMON, Maître de Conferences, HDR, Telecom Bretagne, Examinateur
M. Christian TIMMERER, Associate Professor, Universität Klagenfurt, Examinateur
M. Jean-Claude DUFOURD, Directeur d‘études, Telecom ParisTech, Examinateur

Si vous êtes intéressés pour assister à cette présentation, merci de me le signaler.

Adaptive streaming techniques for responsive images

Responsive image is a term in the Web world corresponding to the techniques involved when an author wants its website to be rendered with the right image for the right client given its viewing condition (screen size, pixel density, network, …). This technique falls, from a research point of view, in the broad category of media adaptation techniques to the user’s context. To me, at first sight, the problem seemed a no-brainer as it has been solved several times, including in the web world for video streaming with the recent approaches of adaptive streaming such as DASH. Naively I thought the same techniques could be used. However, after attending some meetings, including this week’s meetup, it appears that the environment constraints are such that the problem is not so simple to solve. In this post, I want to highlight the differences and give an example of how DASH manifest could be used for responsive images (I’m not really proposing it though). Continue reading Adaptive streaming techniques for responsive images

B. Pellan’s PhD thesis “Multimedia Scene Scalability”

It is a great pleasure to announce that the Ph.D. thesis of Benoit Pellan, that I supervised, is finally published and it is written in English. So don’t hesitate to download, read and comment it.


In this dissertation, we propose to apply the concept of media scalability, as defined in hierarchical coding, to multimedia scenes which are the choreographers that organize several media into a visual and interactive presentation over time. As a consequence, an initial scene is progressively enhanced by successive transformations, that we call adaptation updates, in order to generate an appealing presentation which is compatible with the user’s context. Our approach, called Scalable MSTI, is built on three scalability axes that separate the Media and the Spatial, Temporal and Interactive properties of a multimedia scene. Each of these axes is composed of scalability layers that enclose adaptation updates. These scalability layers are organized according to an order relation based on the adaptation parameters selected by the editor to cope with envisioned user’s contexts. The presentation alternatives that are described in a scalable scene can be represented as a graph where an adaptation decision corresponds to the selection of a way along an adaptation path. Multimedia scene scalability has been applied to the digital radio domain by enabling the progressive playback of multimedia services on receivers. Additionally, the adaptation capabilities of scalable services would allow multimedia enhancements on wide-screen receivers or would avoid disabling the screen of multimedia car-radios while driving because of security regulations banning the display of animations.

InterMedia Final Review

These two days (Oct. 5th and 6th) are the days for the final review of the European InterMedia Network of Excellence to which we participated. This project has given us the opportunity to collaborate with different european research centers and to prepare several demos:

Most of these demos led to publications and to modifications of GPAC:

  • Improved support for H264|AVC video
  • Addition of a new type of plugin for audio filters
  • Addition of a UPnP stack, first using the Intel Tools and then using Platinum