Memory leaks on EVRPresenter when changes video source frequently

[veve178]

I have 4 MediaElement instances presented on 4 monitor with LAV decoder which the problem could occur on all Hardware Acceleration setting.

To reproduce the problem, first you need to have a subscribed event on the newly opened media. The video will change to other one when it is almost finished.

        private void VideoPlayer_MediaOpened(object sender, RoutedEventArgs e) {
            if (this.videoPlayer.MediaDuration < 0)
            {
            //PLAY NEXT VIDEO IN THE FOLDER
                return;
            }
            System.Timers.Timer timer = new System.Timers.Timer();
            timer.Interval = (double)(this.videoPlayer.MediaDuration/ TimeSpan.TicksPerMillisecond) * 3 - 500d;
            timer.Elapsed += TimerCallback;
            timer.AutoReset = false;  // makes it fire only once
            timer.Start(); // Start
        }


        private void TimerCallback(object sender, System.Timers.ElapsedEventArgs e) {
            this.videoPlayer.Stop();
            this.videoPlayer.Close();
            this.videoPlayer.Source = null;

            //PLAY NEXT VIDEO IN THE FOLDER
            this.videoPlayer.Source = new Uri(@path, UriKind.Absolute);
            this.videoPlayer.Play();
        }

The memory usage in the EVRPresenter64.dll keep increasing when it switched to another source.

[xmedeko]

Thanks for the report. Does the bug appears for the VMR9 renderer? Do you need to use EVR?

I do not understand the EVR code much, so If you can fix the problem, then a PR is welcome.

[veve178]

both VMR9 and EVR can produce same result.

[xmedeko]

@veve178 You have written: "The memory usage in the EVRPresenter64.dll keep increasing ...". When you use VMR9, you do not use EVRPresenter64.dll - you can delete it. So, are you sure you use VMR9? If so, can you detect where is memory increasing?

[mi1124]

Hi,

I get the following exception in D3DRenderer in SetBackBufferInternal():
System.AccessViolationException occurred. An attempt was made to read or write in the protected memory. This is often an indication that other memory is corrupted.

StackTrace:
bei MS.Win32.PresentationCore.UnsafeNativeMethods.InteropDeviceBitmap.Create(IntPtr d3dResource, Double dpiX, Double dpiY, UInt32 version, FrontBufferAvailableCallback pfnCallback, Boolean isSoftwareFallbackEnabled, SafeMILHandle& ppInteropDeviceBitmap, UInt32& pixelWidth, UInt32& pixelHeight)
bei System.Windows.Interop.D3DImage.SetBackBuffer(D3DResourceType backBufferType, IntPtr backBuffer, Boolean enableSoftwareFallback)
bei Vdi.VideoFramework.MediaPlayer.D3DRenderer.SetBackBufferInternal(IntPtr backBuffer) in D:\Sources\Repository\Main\Components\VideoFramework_2015\SourceCode\VideoFramework\MediaPlayer\D3DRenderer.cs:Zeile 387.

this exception occurs after sometime when I try playing mulitple videos .
I used [System.Runtime.ExceptionServices.HandleProcessCorruptedStateExceptionsAttribute()] on the function which was causing the AccessViolationException, but the application still crashes.
Any workaround for this exception?

[SoftwareMagicIT]

To prevent memory leak and other issues you need to close previous video before load next on same instance of player. WPF-Mediakit include close method for video resources released. Also I suggest to use gc.collect for clean garbage of .net