Thanks to Bonnie King <bonn...@fnal.gov>, I think I have solved this problem
Here's the sequence that appears to have worked for me: yum remove libmatroska yum remove libebml yum --enablerepo=epel install libebml-1.2.1-1.el6.i686 yum --enablerepo=epel install libmatroska-1.2.0-1.el6.i686 yum --enablerepo=epel --disablerepo=atrpms --enablerepo=rpmfusion-free-updates install vlc Now to test it out more fully.... Malcolm