I have mplayer and its plug-ins. it can play most of medias (local or web ones), web videos were tested via
however, it doesn't play web wmv for eaxmple
it pops up mplayer-plugin window and loading. seems after loading, it flashs a few times (1 or 2), and stopped.
I am using the latest version of firefox, mplayer and plugin, i mean, it updated.
i haev codecs at /usr/lib/win32 and soft linked to /usr/lib/codecs