simplepie-gametrailers.php

<?php
// Extend SimplePie to retrieve the embed data from a GameTrailers.com feed

// Load SimplePie
include('simplepie.class.php');

// Define the GameTrailers namespace
define("SIMPLE_NAMESPACE_GAMETRAILERS", "http://www.gametrailers.com/rssexplained.php");

// Extend SimplePie_Item with our own class
class SimplePie_Item_Gametrailers extends SimplePie_Item
{
	// Make sure we pass everything through
	function __construct($feed, $data) {
		parent::__construct($feed, $data);
	}

	// Use SimplePie_Item's API to get the embed code
	function get_embed_id()
	{
		$data = $this->get_item_tags(SIMPLE_NAMESPACE_GAMETRAILERS, 'fileType');
		return $data[0]['child']['']['embedcode'][0]['data'];
	}
}

// ...

// Example of how to use.

$sp = new SimplePie();
$sp->set_item_class('SimplePie_Item_Gametrailers');
$sp->set_feed_url('http://www.gametrailers.com/rssgenerate.php?s1=&favplats[pc]=pc&vidformat[flv]=on&type[gameplay]=on&embed=on&quality[sd]=on&agegate[no]=on&orderby=newest&limit=20');
$sp->init();

foreach($sp->get_items() as $item) {
	echo $item->get_title() . ' - ';
	var_dump($item->get_embed_id());
	echo '<br />';
}