[WPF][UWP] MediaPlayerElement. Mfplat.dll exception c0000005 after some time when playing 4k/uhd videos.

stfg1981 1

Hello,

we have multiple UWP MediaPlayerElements hosted in a WindowsXamlHost in a WPF App.
After some time 4k/UHD Videos are played, our app crashed with a 0xc0000005 error from the MFPlat.dll.

Is there a bug in the MediaPlayerElement or the underlying Windows Media Foundation?

DaisyTian-1203 11,626 Reputation points

2021-01-15T09:32:38.257+00:00

@stfg1981
Does your MediaPlayerElement refer to this? Could you tell me how did get MediaPlayerElement. Mfplat.dll ? Does the problem still exist if you use MediaPlayer?
stfg1981 1 Reputation point

2021-01-18T09:31:14.627+00:00

Hello @DaisyTian-MSFT
Yes we use the new MediaPlayerElement from WinRT hosted in a WindowsXamlHost.
What do you mean with "Could you tell me how did get MediaPlayerElement. Mfplat.dll ?"
We'are doing now a test with the old MediaPlayer from WinRT.
stfg1981 1 Reputation point

2021-01-18T10:34:18.867+00:00

Hello @DaisyTian-MSFT
We seen that the used Player from the MediaPlayerElement (under the hood) is the MediaPlayer that you are suggested. Described here.
Conclusion is that the Problem still exists in MediaPlayer.
DaisyTian-1203 11,626 Reputation points

2021-01-19T07:59:49.49+00:00

@stfg1981
Did you try to run it in Native UWP app? In order to reproduce your error more effectively, could you show me your related snipped code for me?
stfg1981 1 Reputation point

2021-01-20T11:02:05.097+00:00

Below is the nearly the complete code. The videos are a mix from 4K/UHD and 1080p and 720p.
But the error seems only to come when 4k/uhd videos are playing.

stfg1981 1

private readonly WindowsXamlHost[] xamlHosts = new WindowsXamlHost[2];
private readonly MediaPlayerElement[] player = new MediaPlayerElement[2];
...CreateMethod()
var newXamlHost = false;
if (xamlHosts[i] == null)
{
xamlHosts[i] = CreateWindowsXamlHostForMediaPlayerElement("MediaPlayerXamlHost" + i);
xamlHosts[i].Visibility = System.Windows.Visibility.Hidden;

hostControl.grid.Children.Add(xamlHosts[i]);
newXamlHost = true;
}

if (player[i] == null)
{
player[i] = UWPTypeFactory.CreateXamlContentByType("Windows.UI.Xaml.Controls.MediaPlayerElement") as MediaPlayerElement;
player[i].Stretch = Stretch.Uniform;
player[i].AutoPlay = false;
}

if (newXamlHost)
xamlHosts[i].Child = player[i];

stfg1981 1

...Disposing Method
if(xamlHosts[i] != null)
xamlHosts[i].Visibility = System.Windows.Visibility.Hidden;

if (player[i]?.MediaPlayer != null)
{
player[i].MediaPlayer.MediaOpened -= MediaPlayer_MediaOpened;
player[i].MediaPlayer.MediaFailed -= MediaPlayer_MediaFailed;
player[i].MediaPlayer.MediaEnded -= MediaPlayer_MediaEnded;

player[i].MediaPlayer.Pause();

var source = player[i].MediaPlayer.Source as MediaSource;
source?.Dispose();

var item = player[i].MediaPlayer.Source as MediaPlaybackItem;
item?.Source?.Dispose();
}

stfg1981 1

...PreLoad Method
var mediaSource = MediaSource.CreateFromUri(source);
var playbackItem = new MediaPlaybackItem(mediaSource);
player[device].Source = playbackItem;

player[device].MediaPlayer.MediaOpened += MediaPlayer_MediaOpened;
player[device].MediaPlayer.MediaFailed += MediaPlayer_MediaFailed;
player[device].MediaPlayer.MediaEnded += MediaPlayer_MediaEnded;

player[device].MediaPlayer.Volume = audioMute ? 0 : audioVolume / 100;

player[device].MediaPlayer.Play();
player[device].MediaPlayer.Pause();

stfg1981 1

...Play Method
if (player[device] != null)
{
xamlHosts[device].Visibility = System.Windows.Visibility.Visible;
player[device].MediaPlayer.Play();
}

1 answer

DaisyTian-1203 11,626 Reputation points

2021-01-21T08:11:24.977+00:00
I can't reproduce the error with you code , below is my simple demo to display the 4k video and it runs well.
The xaml code is:

<xamlhost:WindowsXamlHost x:Name="myMediaPlayer" InitialTypeName="Windows.UI.Xaml.Controls.MediaPlayerElement" Loaded="myMediaPlayer_Loaded"/>

The code for myMediaPlayer_Loaded:

private async void myMediaPlayer_Loaded(object sender, RoutedEventArgs e) { WindowsXamlHost windowsXamlHost = (WindowsXamlHost)sender; Windows.UI.Xaml.Controls.MediaPlayerElement mediaPlayerElement = (Windows.UI.Xaml.Controls.MediaPlayerElement)windowsXamlHost.Child; StorageFile file = await StorageFile.GetFileFromPathAsync(@"C:\Users\daisyt\Videos\4k.mp4"); mediaPlayerElement.Source = MediaSource.CreateFromStorageFile(file); mediaPlayerElement.AreTransportControlsEnabled = true; mediaPlayerElement.AutoPlay = true; }

Could you use my code to create your a MediaPlayerElement to check if it can play your 4k/uhd videos?

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stfg1981 1 Reputation point

2021-01-21T09:19:29.057+00:00

Yes, one time Video playback works well. The Error comes not immediately.

Here a bit more info about our app:
Our App is a "Digital Signage" Player and thefore the app perhaps runs 24/7. It has multiple Channels, usually 1-4. In Each channel are 2 MediaPlayerElements, one is visible and one is hidden. A video is played in the first MediaPlayerElement, and in the second MediaPlayerElement is a Video loaded and on pause. When the first video is ended the second one are become visible and play and the first becomes hidden.

After some time of playing well, the error comes. After every crash, the app restarted. The the screen below.

DaisyTian-1203 11,626 Reputation points

2021-02-09T02:55:22.19+00:00

@stfg1981
How about to ask your question in Microsoft.Toolkit.Win32? You may get better help in there.
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[WPF][UWP] MediaPlayerElement. Mfplat.dll exception c0000005 after some time when playing 4k/uhd videos.

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