Black screen for certain video files

[habim84]

This is the XAML for the vlc:MediaElement:
<StackPanel> <vlc:MediaElement x:Name="mediaPlayer" AreTransportControlsEnabled="True" HardwareAcceleration="False" Height="1000"/> </StackPanel>
This is the C# code to load the media source onto the MediaElement:

public sealed partial class Player : Page
    {
        private const string FILE_TOKEN = "{SOME GUID}";
        public Player()
        {
            this.InitializeComponent();
            if (!App.setOptions)
            {
                //mediaPlayer.Options.Add("glconv", "direct3d9");
                App.setOptions = true;
            }
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);
            Episode s = (Episode)e.Parameter;
            StorageFile file = s.episodeFile;
            if (file != null)
            {
                StorageApplicationPermissions.FutureAccessList.AddOrReplace(FILE_TOKEN, file);
                mediaPlayer.Source = null;
                mediaPlayer.Source = $"winrt://{FILE_TOKEN}";
            }

        }

        protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
        {
            mediaPlayer.Stop();
        }
}

Somehow for some video files, it works normally but for some files I only get the audio working but the video output is just a black screen. I did try setting the HardwareAcceleration attribute to 'true' but nothing changed.