I'm having interesting troubles with my mplayerplug-in in firefox. I run Fedora 5 x86_64, but with a 32 bit firefox, mplayer, and mplayerplug-in.

If there is any auditory program (rhythmbox, etc) running when I start the plug in, the sound output is garbage static. Killing the other sound app doesn't help. However, if I start the mplayerplug-in first, the sound works fine. If I start another sound program while it is running though, within a few seconds, the sound returns to garbage. As long as, when the plug-in starts, there are no other sound programs going, it is fine. It seems to be intolerant of sharing sound though.

I suspect it may be codec related for one reason - only mpg's give corrupted sound, wmv's are fine. That's ironic, wmv works better than mpg.

Updating essential codecs did nothing. (I should note that I don't have this problem with mplayer or gmplayer, just the plug-in)

Neither does an upgrade of the plugin itself.