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1. Use wp_get_attachment_image_src instead.

   Obviously you would want to add some error checking, but this would be sample usage given your scenario:

   // wp_get_attachment_image_src requires the attachment id, so get that first
   $attachment_id = get_post_thumbnail_id($post->ID);
   // define the desired size as an array in the second option
   $image_attr = wp_get_attachment_image_src($attachment_id, array(128,128));
   // wp_get_attachment_image_src returns an array: 
   // [0] = url, [1] = width, [2] = height, [3] = resized (true / false)
   // Retrieve the url from the array
   $url = $image_attr[0];
   
   // pass the url into your media element
   <media:content medium="image" width="128" url="<?php echo $url; ?>" />
   

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