Se ne devi adattare uno solo puoi semplicemente levarla manualmente sennò potresti fare cosi
Codice PHP:

$url= 'http://www.metacafe.com/fplayer/hea..._in_game_1/.swf';

$exp = explode('/',$url);

$new_url = 'http://www.metacafe.com/fplayer/'.$exp[count($exp)-2].substr($url,-4);

echo $new_url; //output: [url]http://www.metacafe.com/fplayer/hea..._in_game_1.swf[/url]