public function getVideoThumbnails()
    {
        $this->ensureMediaGroupIsNotNull();
        if ($this->getMediaGroup()->getThumbnail() != null) {

            $thumbnailArray = array();

            foreach ($this->getMediaGroup()->getThumbnail() as $thumbnailObj) {
                $thumbnail = array();
                $thumbnail['time'] = $thumbnailObj->time;
                $thumbnail['height'] = $thumbnailObj->height;
                $thumbnail['width'] = $thumbnailObj->width;
                $thumbnail['url'] = $thumbnailObj->url;
                $thumbnailArray[] = $thumbnail;
            }
            return $thumbnailArray;
        } else {
            return array();
        }
    }