sS youTubeGetLiveStreamID(S videoID) {
  S url = "https://www.googleapis.com/youtube/v3/videos?part=liveStreamingDetails&id=" + urlencode(videoID) + "&key=" + youTubeDataAPIKey();
  Map map = cast loadJSONPage(url);
  printStruct(map);
  L<Map> items = cast map.get('items);
  Map item = first(items);
  if (item == null) null;
  ret (S) item.get('activeLiveChatId);
}