FilgraphManagerClass Freeze in windows Form Application

Muhammad Asad Ashraf 1

My Windows form Application got freeze while creating an instance of FilgraphmanagerClass

The problem occurs when I click menubar on the picture box panel and when the video trying to start it tries to create an instance of FilgraphManagerClass and got stuck.

I tried to create an instance using thread and background worker but nothing is working

Castorix31 85,956 Reputation points

2020-08-10T07:43:29.797+00:00

This old sample still works fine on my Windows 10 OS
But you can also do it without FilgraphManager by declaring IGraphBuilder and other interfaces with P/Invoke
Daniel Zhang-MSFT 9,626 Reputation points

2020-08-10T08:07:09.423+00:00

Hi MuhammadAsadAshraf,
According to your description, I can't reproduce the situation. What goes on in this constructor of FilgraphManagerClass? And it may freeze the main thread.
So in order to find the problem more accurately, please provide some relevant code.
You can also use async await to prevent winform application from freezing.
Here is a code example in this link you can refer to.
Best Regards,
Daniel Zhang
Muhammad Asad Ashraf 1 Reputation point

2020-08-13T07:29:54.397+00:00

Please see the image of code got freeze when i open menubar on Video panel
Muhammad Asad Ashraf 1 Reputation point

2020-08-13T07:31:21.347+00:00

The code for instance call from here

Muhammad Asad Ashraf 1

Thanks for this reference
Cleanup method code solves this problem of freezing but it also closes my menubar open on the picture box
Is there any workaround on this problem

   private void CleanUp()
    {
        if (m_objMediaControl != null)
            m_objMediaControl.Stop();

        m_CurrentStatus = MediaStatus.Stopped;

        if (m_objMediaEventEx != null)
            m_objMediaEventEx.SetNotifyWindow(0, 0, 0);

        if (m_objVideoWindow != null)
        {
            m_objVideoWindow.Visible = 0;
            m_objVideoWindow.Owner = 0;
        }

Daniel Zhang-MSFT 9,626 Reputation points

2020-08-14T09:55:49.72+00:00

Hi MuhammadAsadAshraf,
I suggest you use Task.Run or Task.Factory.StartNew to execute Test() or some long running or blocking operation on another thread.
As follows:
private async void Button_Click(object sender, RoutedEventArgs e) { await Task.Run(() => Test()); }
Best Regards,
Daniel Zhang

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