public function CheckConstraints(KDLMediaDataSet $source, KDLFlavor $target, array &$errors = null, array &$warnings = null)
 {
     $vidCodecArr = array("g2m3", "g2m4", "gotomeeting3", "gotomeeting4", "gotomeeting", "icod", "intermediate codec");
     if (isset($source->_video) && $source->_video->IsFormatOf($vidCodecArr)) {
         return false;
     }
     if (parent::CheckConstraints($source, $target, $errors, $warnings) == true) {
         return true;
     }
     return false;
 }