It looks like you are using totem-gstreamer. one way to check is to run "apt-cache policy totem-gstreamer" if its installed you are using it if its not installed please try with totem-xine. only one can be on your system at a time (they conflict)
It looks like you are using totem-gstreamer. one way to check is to run "apt-cache policy totem-gstreamer" if its installed you are using it if its not installed please try with totem-xine. only one can be on your system at a time (they conflict)