A player not appearing in the list means its support module failed to load. The only obvious cause for that would be if you don't have python-notify (or whichever package in your distro provides the pyinotify module for Python).
A player not appearing in the list means its support module failed to load. The only obvious cause for that would be if you don't have python-notify (or whichever package in your distro provides the pyinotify module for Python).