How to control the speed of a WMV video recorded with DirectShowNet!

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Now,I've recorded the videos .But when I play it with Media Player ,it goes so fast !
I want to control it with IMediaPostion or IMediaSeeking ,but seems I don't get the right way .
Here ,the codes:

DsDevice[] audios;
            DsDevice[] videos;
            audios = DsDevice.GetDevicesOfCat(FilterCategory.AudioInputDevice);
            videos = DsDevice.GetDevicesOfCat(FilterCategory.VideoInputDevice);
            ICaptureGraphBuilder2 theCapBuilder = null;
            IBaseFilter capFilter = null;
            IBaseFilter audFilter=null;
            IBaseFilter asfWriter = null;
            IMediaControl theControl = null;
            IMediaSeeking theSeeking = null;
            IMediaPosition thePosition = null;
            IVideoWindow theWindow = null;
            IAMStreamConfig AMConfig = null;

            IFilterGraph2 theFilterGraph = null;
            theCapBuilder = new CaptureGraphBuilder2() as ICaptureGraphBuilder2;
            theFilterGraph = new FilterGraph() as IFilterGraph2;
            theCapBuilder.SetFiltergraph(theFilterGraph);
            theFilterGraph .AddSourceFilterForMoniker (videos[0].Mon ,null,videos [0].Name ,out capFilter );
            theFilterGraph .AddSourceFilterForMoniker (audios[0].Mon ,null ,audios [0].Name ,out audFilter);
            IFileSinkFilter pTmpSink = null;
            
            
            SaveFileDialog theDlg = new SaveFileDialog();
            theDlg.ShowDialog();
            
            string szOutputFileName = theDlg.FileName;

            int hr =theCapBuilder .SetOutputFileName(MediaSubType.Asf  , szOutputFileName, out asfWriter, out pTmpSink);
            IConfigAsfWriter theConfig = asfWriter as IConfigAsfWriter;
            
            Guid theGuid = new Guid(0x6E2A6955, 0x81DF, 0x4943, 0xBA, 0x50, 0x68, 0xA9, 0x86, 0xA7, 0x08, 0xF6);
            theConfig.ConfigureFilterUsingProfileGuid(theGuid );
            theCapBuilder.RenderStream(null, null, capFilter, null, asfWriter);
            theCapBuilder.RenderStream(null, null, audFilter, null, asfWriter);
            theSeeking = theFilterGraph as IMediaSeeking;
            thePosition =theFilterGraph as IMediaPosition;
            theWindow = theFilterGraph as IVideoWindow;

            //Here ,all theSeeking and thePostion don't help 
            theSeeking.SetTimeFormat(TimeFormat .Sample  );
            theSeeking.SetRate(1);
            thePosition.put_Rate(1);
           
            theWindow.put_Owner( this.Handle);
            theWindow.put_Visible(OABool.True);
            theWindow.put_WindowState(DirectShowLib.WindowState.Show);
            theWindow.SetWindowPosition(0, 0, 100, 200);
            
            theWindow.put_WindowStyle(WindowStyle.Child|WindowStyle .ClipChildren );
            
          
            
            theControl = theFilterGraph as IMediaControl;
            
            theControl.Run();
            this.Text =audios [0].Name ; 

I've had a try with IAMStreamConfig ,but didn't find the interface ..
AND,here is a another question :

Guid theGuid = new Guid(0x6E2A6955, 0x81DF, 0x4943, 0xBA, 0x50, 0x68, 0xA9, 0x86, 0xA7, 0x08, 0xF6);
            theConfig.ConfigureFilterUsingProfileGuid(theGuid );

What is the GUID if I want to record to AVI ?