WPF MediaElement Video freezes

c#, mediaelement, windows, wpf

Solution

I googled it and found that this was WPF graphic issue related to software rendering. The issue is solved by adding this piece of code into the ViewPageLoaded method.

        try
        {
            var hwndSource = PresentationSource.FromVisual(this) as HwndSource;
            var hwndTarget = hwndSource.CompositionTarget;
            hwndTarget.RenderMode = RenderMode.SoftwareOnly;
        }
        catch (Exception ex)
        {
            Log.ErrorException(ex.Message, ex);
        }

It helped me to solve the problem. Hope it will help you too.

Got the answer from here. Thanks to @detale for the solution

Problem

I am using Image and MediaElement in wpf project, where I show Images and Videos from file system. I have few timers, which load files to Image/MediaElement controls. Everything works for 4-5 hours, but then MediaElement Video file freezes and MediaEnded event does not occur. I restart the application, it runs without any problem, but after some hours this problem occurs again. My WPF XAML code: ``` <Grid Name="MainGrid"> <Image HorizontalAlignment="Center" VerticalAlignment="Center" Name="MainImage" Stretch="Fill" /> <MediaElement MediaEnded="MediaEnded" MediaOpened="MediaOpened" LoadedBehavior="Manual" HorizontalAlignment="Center" Name="VideoControl" VerticalAlignment="Center" Stretch="Fill" UnloadedBehavior="Manual"/> </Grid> ``` C# code: ``` public partial class ImageView { private static readonly Logger Log = LogManager.GetCurrentClassLogger(); private static String _advCheckGuid; private List<String> _FolderNames; private int _FolderIndex = 0; private MainWindow _MainWindow; private List<String> _PathList; private List<String> _CheckPathList; private int _Index; private BitmapImage _BitmapImage; private volatile bool _Running = true; private Backend _Backend; private ApplicationDeployment _UpdateCheck; // Threads private Timer _ImageTimer; private Timer _UpdateTimer; private Timer _FolderClearTimer; private Timer _CheckApplicationUpdateTimer; private Thread _TerminationThread; public ImageView() { InitializeComponent(); _PathList = new List<string>(); _CheckPathList = new List<string>(); _Index = 0; } private void ViewPageLoaded(Object sender, EventArgs e) { _FolderNames = new List<string> { Constants.AdsFolderFirst, Constants.AdsFolderSecond }; _Backend = new Backend(); _MainWindow = (MainWindow)Window.GetWindow(this); _ImageTimer = new Timer(Constants.DefaultImageTimer); _ImageTimer.Elapsed += ChangeImageSource; _ImageTimer.Start(); } private void ChangeImageSource(object sender, System.Timers.ElapsedEventArgs e) { Application.Current.Dispatcher.Invoke( DispatcherPriority.Normal, new Action( delegate() { try { if (MainImage != null && MainImage.Source != null) { MainImage.Source = null; } if (VideoControl != null && VideoControl.Source != null) { VideoControl.Stop(); VideoControl.Source = null; } if (_Index >= _PathList.Count) { _Index = 0; } if (_PathList.ElementAt(_Index) != null) { Log.Info(String.Format("Start [ChangeImageSource]. Element: {0}, Index: {1}", _PathList.ElementAt(_Index), _Index)); try { _ImageTimer.Stop(); String[] checkExt = _PathList.ElementAt(_Index).Split('.'); String ext = checkExt[checkExt.Length - 1]; if (ext.Equals("jpg", StringComparison.CurrentCultureIgnoreCase) || ext.Equals("jpeg", StringComparison.CurrentCultureIgnoreCase) || ext.Equals("png", StringComparison.CurrentCultureIgnoreCase)) { _ImageTimer.Interval = Constants.NormalImageTimer; ShowImage(_PathList.ElementAt(_Index)); } else if (ext.Equals("mp4", StringComparison.CurrentCultureIgnoreCase) || ext.Equals("3gp", StringComparison.CurrentCultureIgnoreCase)) { _ImageTimer.Interval = Constants.VideoDefaultTimer; PlayQueue(_PathList.ElementAt(_Index)); } _ImageTimer.Start(); _Index++; } catch (Exception exception) { Log.ErrorException(exception.Message, exception); } } } catch (Exception exception) { Log.ErrorException(exception.Message, exception); } })); } private void ShowImage(String fileName) { try { if (!String.IsNullOrEmpty(fileName)) { _BitmapImage = LoadImage(fileName); MainImage.Source = _BitmapImage; } } catch (Exception e) { Log.ErrorException(e.Message, e); } } private void PlayQueue(String fileName) { try { if (!String.IsNullOrEmpty(fileName)) { VideoControl.LoadedBehavior = MediaState.Play; VideoControl.Source = new Uri(fileName, UriKind.Absolute); } } catch (Exception e) { Log.ErrorException(e.Message, e); } } private void MediaEnded(object sender, EventArgs e) { try { if (MainImage != null && MainImage.Source != null) { MainImage.Source = null; } if (VideoControl != null && VideoControl.Source != null) { VideoControl.Stop(); VideoControl.Source = null; } if (_Index >= _PathList.Count) { _Index = 0; } if (_PathList.ElementAt(_Index) != null) { Log.Info(String.Format("Start [MediaEnded oper]. Element: {0}, Index: {1}", _PathList.ElementAt(_Index), _Index)); try { _ImageTimer.Stop(); String[] checkExt = _PathList.ElementAt(_Index).Split('.'); String ext = checkExt[checkExt.Length - 1]; if (ext.Equals("jpg", StringComparison.CurrentCultureIgnoreCase) || ext.Equals("jpeg", StringComparison.CurrentCultureIgnoreCase) || ext.Equals("png", StringComparison.CurrentCultureIgnoreCase)) { _ImageTimer.Interval = Constants.NormalImageTimer; ShowImage(_PathList.ElementAt(_Index)); } else if (ext.Equals("mp4", StringComparison.CurrentCultureIgnoreCase) || ext.Equals("3gp", StringComparison.CurrentCultureIgnoreCase)) { _ImageTimer.Interval = Constants.VideoDefaultTimer; PlayQueue(_PathList.ElementAt(_Index)); } _ImageTimer.Start(); _Index++; } catch (Exception exception) { Log.ErrorException(exception.Message, exception); } } } catch (Exception exception) { Log.ErrorException(exception.Message, exception); } } private void MediaOpened(object sender, EventArgs e) { } private BitmapImage LoadImage(string myImageFile) { BitmapImage myRetVal = null; if (!String.IsNullOrEmpty(myImageFile)) { var image = new BitmapImage(); try { using (FileStream stream = File.OpenRead(myImageFile)) { image.BeginInit(); image.CacheOption = BitmapCacheOption.OnLoad; image.StreamSource = stream; image.EndInit(); } } catch (Exception exception) { Log.ErrorException(exception.Message, exception); } myRetVal = image; } return myRetVal; } ```

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