web cam videos problme?

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VB

i try this
with a refrence dll file

Private Sub cboVideoSource_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboVideoSource.SelectedIndexChanged


       If cboVideoSource.SelectedItem <> "No Video Devices" Then
           If VideoSourcePlayer1.IsRunning = True Then
               VideoSourcePlayer1.SignalToStop()
               VideoSourcePlayer1.WaitForStop()
           End If

           VideoCaptureSource = New VideoCaptureDevice(VideoDevices(cboVideoSource.SelectedIndex).MonikerString)
           VideoSourcePlayer1.VideoSource = VideoCaptureSource
           VideoSourcePlayer1.Start()
       End If
   End Sub

videos show in player but just as image is is not like video moving kindly help me