randvideo.php isminde dosyanı oluştur sunucuna koy
<?php
	$file[1] = "birinci.flv";
	$file[2] = "ikinci.flv";
	$file[3] = "ucuncu.flv";
	$file[4] = "dorduncu.flv";
	$file[5] = "besinci.flv"; 
	$Filename = $file[array_rand($file)]; 
    header("Pragma: public");
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Content-type: video/flv");
    header("Content-Disposition: attachment; filename=".basename($filename).";" );
    header("Content-Transfer-Encoding: binary");
    readfile("$Filename "); 
?>

htaccess şu şekilde editle
RewriteRule videolar/(.*).flv$ randvideo.php [NC]




Örnekler :
http://stackoverflow.com/questions/1...working-in-php