Bueno, al parecer, acá está el problema reportado:
https://bugzilla.redhat.com/show_bug.cgi?id=718013
No olvides instalar rpmfusion free y nonfree
También, instala los plugins de gstreamer (los devels no)
su -c 'yum -y install gstreamer gstreamer-devel gstreamer-devel-docs.noarch gstreamer-ffmpeg gstreamer-java gstreamer-plugins-bad gstreamer-plugins-bad-free gstreamer-plugins-bad-free-extras …