void TestPlayAtTimeInTitle()
        {
            int                  hr;
            DvdHMSFTimeCode      pStartTime = new DvdHMSFTimeCode();
            IDvdCmd              ppCmd;
            DvdPlaybackLocation2 pLocation;

            AllowPlay();
            pStartTime.bHours   = 0;
            pStartTime.bMinutes = 0;
            pStartTime.bSeconds = 1;
            pStartTime.bFrames  = 0;

            hr = m_idc2.PlayAtTimeInTitle(2, pStartTime, DvdCmdFlags.Flush | DvdCmdFlags.SendEvents, out ppCmd);
            DsError.ThrowExceptionForHR(hr);

            hr = m_idi2.GetCurrentLocation(out pLocation);
            DsError.ThrowExceptionForHR(hr);

            hr = m_idc2.Stop();
            DsError.ThrowExceptionForHR(hr);

            Debug.Assert(pLocation.TitleNum == 2, "TestPlayAtTimeInTitle");
            Debug.Assert(pLocation.TimeCode.bMinutes == 0, "TestPlayAtTimeInTitle2");
            Debug.Assert(pLocation.TimeCode.bSeconds == 2, "TestPlayAtTimeInTitle3");
        }
            /// <summary>
            /// DVD Code - Play DVD
            /// </summary>
            /// <param name="db1"></param>
            public void PlayDVD(DBTrackInfo db1)
            {
                DBLocalMedia mediaToPlay = db1.LocalMedia[0];

                if (mediaToPlay.State != MediaState.Online) mediaToPlay.Mount();
                while (mediaToPlay.State != MediaState.Online) { Thread.Sleep(1000); };
                string dvdNavigator = "";
                string dslibdvdnavMonikerString = @"@device:sw:{083863F1-70DE-11D0-BD40-00A0C911CE86}\{1FFD2F97-0C57-4E21-9FC1-60DF6C6D20BF}";
                Log.Info("finding dslibdvdnav filter");
                IBaseFilter filter = Marshal.BindToMoniker(dslibdvdnavMonikerString) as IBaseFilter;
                if (filter != null)
                {
                  Log.Info("dslibdvdnav filter found!");
                  DirectShowUtil.ReleaseComObject(filter);
                  filter = null;
                  using (MediaPortal.Profile.Settings xmlreader = mvCentralCore.MediaPortalSettings)
                  {
                xmlreader.SetValue("dvdplayer", "navigator", "dslibdvdnav");
                dvdNavigator = xmlreader.GetValueAsString("dvdplayer", "navigator", "DVD Navigator");
                  }
                }
                else
                  Log.Info("dslibdvdnav filter not found using mp default one!");

                MediaPortal.Player.g_Player.Play(mediaToPlay.GetVideoPath());

                // reset setting back to original
                if (dvdNavigator == "dslibdvdnav")
                  using (MediaPortal.Profile.Settings xmlreader = mvCentralCore.MediaPortalSettings)
                  {
                xmlreader.SetValue("dvdplayer", "navigator", "DVD Navigator");
                  }

                PurgeEntries();
                l1 = ROTClass.GetFilterGraphsFromROT();
                foreach (DSGrapheditROTEntry e1 in l1)
                {
                  logger.Info(e1.ToString());
                  _graphBuilder = e1.ConnectToROTEntry() as IGraphBuilder;

                  _dvdbasefilter = DirectShowUtil.GetFilterByName(_graphBuilder, dvdNavigator);

                  _dvdCtrl = _dvdbasefilter as IDvdControl2;
                  _dvdCtrl.SetOption(DvdOptionFlag.HMSFTimeCodeEvents, true); // use new HMSF timecode format
                  _dvdCtrl.SetOption(DvdOptionFlag.ResetOnStop, false);
                  _dvdCtrl.SetDVDDirectory(mediaToPlay.GetVideoPath());
                  DirectShowUtil.RenderOutputPins(_graphBuilder, _dvdbasefilter);
                  _basicVideo = _graphBuilder as IBasicVideo2;
                  _mediaCtrl = _graphBuilder as IMediaControl;
                  //hr = _mediaCtrl.Run();
                  //hr = _mediaCtrl.Pause();
                  //_offsetseek = (ulong)seekbar.Value;
                  TimeSpan t1 = TimeSpan.FromMilliseconds(0);
                  TimeSpan t2 = TimeSpan.Parse(db1.OffsetTime);
                  t1 = t1.Add(t2);
                  //                            t1 = TimeSpan.Parse(db1.PlayTime);
                  t2 = t2.Add(TimeSpan.Parse(db1.PlayTime));
                  DvdHMSFTimeCode t3 = mvCentralUtils.ConvertToDvdHMSFTimeCode(t1);
                  DvdHMSFTimeCode t4 = mvCentralUtils.ConvertToDvdHMSFTimeCode(t2);
                  //if (state == FilterState.Stopped)
                  int hr = _mediaCtrl.Run();
                  hr = _dvdCtrl.PlayAtTimeInTitle(db1.TitleID, t3, DvdCmdFlags.Flush | DvdCmdFlags.Block, out _cmdOption);
                  //                    hr = _dvdCtrl.PlayPeriodInTitleAutoStop(6, t3, t4, DvdCmdFlags.Flush | DvdCmdFlags.Block, out _cmdOption);
                  DsError.ThrowExceptionForHR(hr);
                  //int hr = _dvdCtrl.PlayChaptersAutoStop(1, db1.ChapterID, 1, 0, out _cmdOption);
                  //DsError.ThrowExceptionForHR(hr);
                }
            }