How to get more than 25 items via Simplepie RSS Feeds?

    include_once(ABSPATH.WPINC.'/feed.php');
    $rss = fetch_feed('http://gdata.youtube.com/feeds/base/users/silviavaldemoros/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile&max-results=50');
    $maxitems = $rss->get_item_quantity(50);

    $rss_items = $rss->get_items(0, $maxitems);
    print_r($rss_items);

Try this code..

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