VlcControl.Dispose never ends after trying to open Blu-ray disk without licensing or after ejecting the disc

[Asteron1024]

I have an issue about Vlc.DotNet.

Generic information

• Vlc.DotNet version : 3.1.0
• Vlc.DotNet project used : WPF/WinForms
• libvlc version : 3.0.7 (x86/x64)
• .net version : 4.7.2
• Project language : C#
• Project build architecture : x86/x64
• Operating system : Windows 10 x64 v2004

Summary

I run Samples.Wpf.Advanced project and play blu-ray disc source
To set license for the blu ray disc i added setting environment vabiable MAKEMKVCON to windows constructor and when starting to play I write my blu-ray key in the memory mapped file.
It good works in normal conditions but if I eject the disc during loading or not call SetLicense() at all, the next call of VlcControl.Dispose never ends and the application is in deadlock

        public MainWindow()
        {
            InitializeComponent();
            var currentAssembly = Assembly.GetEntryAssembly();
            var currentDirectory = new FileInfo(currentAssembly.Location).DirectoryName;
            var libDirectory = new DirectoryInfo(System.IO.Path.Combine(currentDirectory, "libvlc", IntPtr.Size == 4 ? "win-x86" : "win-x64"));
            vlcLibDirectory = new DirectoryInfo(libDirectory );

            var localPath = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
            var makemkvRelativePath = Environment.Is64BitProcess ? @"makemkvcon64.exe" : @"makemkvcon.exe";
            var makemkvPath = Path.Combine(localPath, makemkvRelativePath);
            Environment.SetEnvironmentVariable("MAKEMKVCON", makemkvPath);
        }

        private void PlayButtonClick(object sender, RoutedEventArgs e)
        { 
            this.control?.Dispose();
            this.control = new VlcControl();
            this.ControlContainer.Content = this.control;
            this.control.SourceProvider.CreatePlayer(this.vlcLibDirectory);

            this.control.SourceProvider.MediaPlayer.Log += (_, args) =>
            {
                string message = $"libVlc : {args.Level} {args.Message} @ {args.Module}";
                System.Diagnostics.Debug.WriteLine(message);
            };

            control.SourceProvider.MediaPlayer.Play(new Uri(@"bluray:///F:\"));

            // Writing to memory mapped file here
            SetLicense();
        }

        private void StopButtonClick(object sender, RoutedEventArgs e)
        {
            this.control?.Dispose(); // this call never ends if not calling SetLicense() or eject the disc during loading the disc 
        }

How to stop or dispose correctly VlcControl in this case?

• I confirm that my issue doesn't happen in VLC itself.

[jeremyVignelles]

Looks similar to #625 : There are a lot of these issues in libvlc, and I was told they would likely be fixed in libvlc 4 with the new stop async.
Unfortunately, this project is dead and will never be compatible with libvlc4