addUser
Adds a user for video mixing during the CDN live streaming.
public int addUser(TranscodingUser user) {
    if (user == null || user.uid == 0) {
      return -Constants.ERR_INVALID_ARGUMENT;
    }
            
            
            
            
            
            
            
            Parameters
- user
 - The transcoding user. See TranscodingUser for details.
 
Returns
- 0: Success.
 - < 0: Failure.