Also place this in every folder which contains image/video files:
<-------- .htaccess code --------->
RewriteEngine On
RewriteCond %{HTTP_REFERER} !
http://www.yourdomain.com/404.html/ [NC]
RewriteCond %{HTTP_REFERER} !
http://www.yourdomain.com/404.html/:80 [NC]
RewriteCond %{HTTP_REFERER} !
http://www.yourdomain.com/404.html/ [NC]
RewriteCond %{HTTP_REFERER} !
http://www.yourdomain.com/404.html/:80 [NC]
RewriteRule .\*
http://www.yourdomain.com/404.html/ [R,L]
<-------- .htaccess code --------->