/listele.php
$id = "_Quavsdhb";
$sifreli_id = base64_encode($id);
echo "<a href=\"izle.php?id=".$sifreli_id."\">Video Linkim</a>";

/izle.php
$id = base64_decode($_GET['id']);
echo "<embed width=\"400\" height=\"400\" src=\"http://www.youtube.com/vi/".$id."\"></embed>";