public static void Feedback(IObserver <FeedbackInfo> observer, FeedbackInfo info)
 {
     if (observer != null)
     {
         observer.OnNext(info);
     }
 }
        public static void Feedback(IObserver <FeedbackInfo> observer, FeedbackInfo info, string logFilePath, bool enableLog = true)
        {
            Feedback(observer, info);

            if (EnableLog && enableLog)
            {
                string prefix = "";
                if (info.Source != null && info.Source.GetType() == typeof(VideoInfo))
                {
                    prefix = ((VideoInfo)info.Source).Name + ":";
                }

                LogHelper.LogInfo(logFilePath, prefix + info.Content);
            }
        }