Как достать превью-картинку с видео vimeo?

$curl = curl_init('https://vimeo.com/138803941');
curl_setopt($curl, CURLOPT_USERAGENT, 'IE20');
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
$out = curl_exec($curl);
curl_close($curl);

preg_match_all( '#meta name="twitter:image" content="(.*?)"#is', $out, $matches_image );
print_r ($matches_image);

preg_match_all( '~twitter:image.+(https?://[^\\"]+)~', $out, $twitterImagesArray );

print_r( end($twitterImagesArray) );