Error loading media: file could not be played
I just want to play this Video: http://tri-mag.de/service/training/media/video/dynamic-stability-die-uebungen-fuer-april-und-mai-56591
On my laptop, this video was shown, but on my desktop I got the error message: "Error loading media: file could not be played".
I'm using latest Firefox, I have copied laptops ff profile to my desktop, but that does not solve the problem. I also reseted ff on my desktop to, also has no efect. Aproximatly three weeks ago, this video worked on my desktop.
Any Ideas!? :D