Aşağıdaki kodlarla ben sorunsuz işlem yapıyorum. İsteyen cURL kullanıp proxy ekleyebilir.

<?php
	/* 
	 * SAINTX » XYZ BOT
	 * 
	 * @author: SAINTX
	 * @web: http://saintx.net
	 * @mail: im@saintx.net
	 * @date: 16.08.2013
	 * @version: 1.0.0
	 */
	
	function get_redtube_video_url($ID) {
		$try = true;
		
		while($try) {
		
			$html = file_get_contents(sprintf('http://www.redtube.com/%s', $ID));
			
			$video_url = preg_match('#flv_h264_url\=(.*?)\&#si', $html, $matches) ? urldecode(end($matches)) : '';
			
			unset($html, $matches);
			
			if(!strstr($video_url, 'http://vid.lsw.redtubefiles.com/'))
				$try = false;
		
		}
		
		unset($try);
		
		return $video_url;
	}
	
	header(sprintf('Location: %s', get_redtube_video_url($_GET['ID'])));