simplexml_load_string - child nodes not showing

I am working with an xml file that I am trying to parse into json format and then decode to an array. I accomplished this mainly using the built in simplexml_load_string and then json_encode. The issue is when calling simplexml_load_string the xml isn’t fully preserved. It seems like the child nodes for video show as object(stdClass). How could I get all values of the xml file? Link to XML

Code:

$xml = simplexml_load_string( file_get_contents('http://ift.tt/1G0yciH') );
$json = json_encode($xml);

Result:

["results"]=>
  object(stdClass)#183 (4) {
    ["previousPage"]=>
    object(stdClass)#184 (1) {
      ["@attributes"]=>
      object(stdClass)#185 (1) {
        ["exists"]=>
        string(5) "false"
      }
    }
    ["nextPage"]=>
    string(1) "2"
    ["total"]=>
    string(2) "40"
    ["resultList"]=>
    object(stdClass)#186 (1) {
      ["video"]=>
      array(20) {
        [0]=>
        object(stdClass)#187 (7) {
          ["@attributes"]=>
          object(stdClass)#188 (2) {
            ["id"]=>
            string(7) "2329124"
            ["type"]=>
            string(3) "960"
          }
          ["description"]=>
          object(stdClass)#189 (0) {
          }
          ["created"]=>
          string(25) "2015-02-18 04:04:52 +0000"
          ["duration"]=>
          string(2) "86"
          ["images"]=>
          object(stdClass)#190 (2) {
            ["image"]=>
            object(stdClass)#191 (1) {
              ["@attributes"]=>
              object(stdClass)#192 (3) {
                ["id"]=>
                string(8) "13503818"
                ["width"]=>
                string(3) "100"
                ["height"]=>
                string(3) "100"
              }
            }
            ["thumbnail"]=>
            object(stdClass)#193 (1) {
              ["@attributes"]=>
              object(stdClass)#194 (3) {
                ["id"]=>
                string(8) "13503819"
                ["width"]=>
                string(3) "372"
                ["height"]=>
                string(3) "210"
              }
            }
          }
          ["videoFiles"]=>
          object(stdClass)#195 (1) {
            ["file"]=>
            object(stdClass)#196 (1) {
              ["@attributes"]=>
              object(stdClass)#197 (3) {
                ["id"]=>
                string(8) "14704560"
                ["formatId"]=>
                string(3) "400"
                ["uploaded"]=>
                string(4) "true"
              }
            }
          }
          ["categories"]=>
          object(stdClass)#198 (1) {
            ["category"]=>
            string(21) "UEFA Champions League"
          }
        }