[1] Univ Appl Sci Osnabruck, Dept Comp Sci, Osnabruck, Germany
[2] Univ Osnabruck, Ctr Informat Management & Virtual Teaching virtUO, Osnabruck, Germany
[3] Univ Pittsburgh, PAWS Lab, Pittsburgh, PA 15260 USA
[4] Fraunhofer IAIS, St Augustin, Germany
[5] Univ Calif Berkeley, Opencast Project, Berkeley, CA 94720 USA
[6] Tech Univ Berlin, MuLF Ctr Multimedia Educ & Res, Berlin, Germany
[7] Free Univ Berlin, Dept Comp Sci, Multimedia Grp, Berlin, Germany
[8] FHTW Berlin, Int Media & Comp, Berlin, Germany
[9] Berlin Inst Technol, MuLF Ctr, Berlin, Germany
[10] Hasso Plattner Inst Software Syst Engn, Semant Technol, Potsdam, Germany
[11] Univ Osnabruck, Virtual Teaching Support Ctr virtUOS, Osnabruck, Germany
[12] Univ Pittsburgh, DAAD Grant, Pittsburgh, PA 15260 USA
[13] ICSI, Multimedia Event Detect, Berkeley, CA 94704 USA