- p.push_back (UserProperty (UserProperty::VIDEO, _("Length"), raw_convert<string> (length ()), _("video frames")));
- p.push_back (UserProperty (UserProperty::VIDEO, _("Size"), raw_convert<string> (size().width) + "x" + raw_convert<string> (size().height)));
+ p.push_back (UserProperty (UserProperty::VIDEO, _("Length"), length (), _("video frames")));
+ p.push_back (UserProperty (UserProperty::VIDEO, _("Size"), String::compose ("%1x%2", size().width, size().height)));