How can I find download links for vimeo videos?
http://vimeo.com/moogaloop/play/clip:6649390/1eab2a25f30f1aadaf5e306d0f40fd6c/1292498602/?q=hd

http://av.vimeo.com/02047/623/34209065.mp4?token=1292496582_34de09a6d13212cf26af08357d311c30

$video_link = "http://vimeo.com/moogaloop/play/clip:".$video_id."/".$request_signature."/".$request_signature_expires."/?q=".$quality."";

public function actionVimeo($video_id)
    {
        $xml_url = "http://vimeo.com/moogaloop/load/clip:$video_id";

        $ch = curl_init($xml_url);
        $cookieFile = Yii::app()->basePath . '/runtime/vimeocookie'. time().'.txt'; //replace this line with code to generate a writeable path in your application
        curl_setopt($ch, CURLOPT_COOKIEJAR, $cookieFile); //the cookie file will be populated with cookies received while viewing the xml page
        curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']); //you need to send a user agent here and it must be the same below when you visit the video url
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $output = curl_exec($ch);
        curl_close($ch);


        $xml = simplexml_load_string($output);
        $request_signature = $xml->request_signature;
        $request_signature_expires = $xml->request_signature_expires;
        $vid_url = "http://vimeo.com/moogaloop/play/clip:".$video_id."/".$request_signature."/".$request_signature_expires."/?q=sd";

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL,$vid_url);
        curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);  //same user agent as on previous vimeo page you visited
        curl_setopt($ch, CURLOPT_COOKIEFILE, $cookieFile); //the cookies in that cookie file will be used while visiting the video URL
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE); //vimeo changes the header location, so you gotta follow it
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $video = curl_exec($ch);
        curl_close($ch);

        unlink($cookieFile); //remove the temporary cookie file

        $savePath = Yii::app()->basePath . '/runtime/testvim.mp4'; //change this to a path your application can write the final video to
        file_put_contents($savePath, $video);

        exit;
    }

http://vimeo.com/moogaloop/load/clip:6649390

XML Parsing Error: XML or text declaration not at start of entity
Location: http://vimeo.com/moogaloop/load/clip:6649390
Line Number 1, Column 5:    <?xml version="1.0" encoding="utf-8"?>
----^