FLV Player is based on Flash Player 8 and utilises the default Macromedia FLV Playback component, which uses a slightly customised skin (blue instead of green highlights). FLV Player is built with Screenweaver Open Source, which is still in beta, so your mileage may vary. Let me know if you encounter unexpected results. Or, even better, join the Screenweaver Open Souce initiative and help us create an even better version of Screenweaver!
Product page: here