video player for WPMU site

We're looking for a plugin which allow us to upload the videos into our own website, either flv/ or avi/rmvb etc is fine, I've tried the WP OS FLV and it works fine with my root blog site, but can't play at the subsite, the player displayed correct, but nothing happened if you click the "Play" button.
Do you have any suggestion about the video player plugin for wordpress mu site?

Thanks