void Playlist_SlidingWindowChanged(IHLSPlaylist sender, IHLSSlidingWindow args)
 {
     try
     {
         if (_initialPlaybackPosition == default(TimeSpan) && args.StartTimestamp != default(TimeSpan))
         {
             _initialPlaybackPosition = args.StartTimestamp;
         }
     }
     catch (Exception Ex)
     {
     }
 }
    void Playlist_SlidingWindowChanged(IHLSPlaylist sender, IHLSSlidingWindow args)
    {
      try
      {
        if (_initialPlaybackPosition == default(TimeSpan) && args.StartTimestamp != default(TimeSpan))
          _initialPlaybackPosition = args.StartTimestamp;
      }
      catch(Exception Ex)
      {

      }
    }