Upon receipt, the server shall set the active Text Track to the one identified by the TrackID in the Track
catalog for the streaming media. If the TrackID does not exist in the Track catalog, OR does not correspond
to the streaming media OR no media is being streamed at the time of receipt of this command, the server
shall return an error status of INVALID_ARGUMENT.
Upon receipt, the server shall set the active Text Track to the one identified by the TrackID in the Track catalog for the streaming media. If the TrackID does not exist in the Track catalog, OR does not correspond to the streaming media OR no media is being streamed at the time of receipt of this command, the server shall return an error status of INVALID_ARGUMENT.