WinUI 3 Acrylic effect not working properly over MediaPlayerElement

[AlgoRythm-Dylan]

Describe the bug

WinUI 3, SDK version 1.5 - the Acrylic effect doesn't work properly over a MediaPlayerElement. It is supposed to have a blurred effect where the content behind the acrylic can be seen, but instead, it's always just the solid tint color with the acrylic texture.

Steps to reproduce the bug

Add a MediaPlayerElement with AreTransportControlsEnabled="True" which is supposed to appear acrylic. You can also opt to put an acrylic rectangle, grid, etc on top of the media player element; none of which work as expected.

Expected behavior

The video can be seen playing "behind" the control, with an acrylic filter.

Screenshots

This issue can be demonstrated without writing any code as it is present also in the WinUI 3 gallery application.

NuGet package version

WinUI 3 - Windows App SDK 1.5.3: 1.5.240428000

Windows version

Windows 11 (22H2): Build 22621

Additional context

My Windows version is actually 22631 but that's not in the drop-down.

[github-actions]

Hi I'm an AI powered bot that finds similar issues based off the issue title.

Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one. Thank you!

Open similar issues:

• MediaPlayerElement - Opacity setting not working (#8585), similarity score: 0.78
• Incorrect Transparency Rendering in WinUI when HDR is Enabled (#8594), similarity score: 0.78

Closed similar issues:

• AcrylicBrush overliad on MediaPlayerElement does not apply blur effect to video content (#9267), similarity score: 0.81
• Acrylic background of the MenuFlyout work well when MediaplayerElement visible but not with the Flyout. (v 1.4) (#8904), similarity score: 0.80
• No acrylic effect above dynamic contents (#8587), similarity score: 0.79

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[AlgoRythm-Dylan]

Issue bot brought me to the answer, which otherwise was difficult to find. Seems this is a compositing limitation in WinUI for now. Rather disappointing & misleading as even the built-in controls attempt but fail to use Acrylic effect over video.

#9267
#5025