create .htaccess and put this in it and upload to your flvideo folder

Code:
RewriteEngine on

RewriteCond %{HTTP_REFERER} !^$

RewriteCond %{HTTP_REFERER} !^http://(www\.)?yourdomain.com(/)?.*$ [NC]

RewriteRule \.(gif|jpe?g|png|bmp|flv)$ templates/images/logo.jpg [L,NC]
If that still doesn't work, another thing you can do is rename the flv file in admin panel (that's why it's there).
or try this: http://www.google.com/search?hl=en&q=pr ... gle+Search

Please do post your findings if someone else here doesn't answer first.