Description

When adding startup movies to Lyra, the movie playback flickers and an ensure conditions fails with the message:

Ensure condition failed: bSuccess  [File:D:\build\++UE5\Sync\Engine\Source\Runtime\MoviePlayer\Private\MoviePlayerThreading.cpp] [Line: 198] 
Only one system can use the SlateThread at the same time. GetMoviePlayer is not compatible with PreLoadScreen. 

Found by internal tester, reproduced 3/3 while verifying [Link Removed].

A video is attached where the tester recorded the startup movie flickering, but the recording makes it look much less severe.

Steps to Reproduce
  1. Create a Lyra Sample project in 5.3
  2. Add a loading screen movie to the Content/Movies folder (LoadingScreen.mp4 from ShooterGame works well)
  3. Open up the project settings and add a startup movie pointing at the loading screen asset
  4. Package the build for windows
  5. Run LyraStarterGame.exe

Actual Result: Startup Movie flickers severely, and an ensure is generated

Expected Result: Video plays without flickering, and no ensure occurs

Callstack
=== Handled ensure: ===

Ensure condition failed: bSuccess  [File:D:\build\++UE5\Sync\Engine\Source\Runtime\MoviePlayer\Private\MoviePlayerThreading.cpp] [Line: 198] 
Only one system can use the SlateThread at the same time. GetMoviePlayer is not compatible with PreLoadScreen.
Stack: 
LyraGame.exe!FSlateLoadingThreadTask::Init() []
LyraGame.exe!FRunnableThreadWin::Run() []
LyraGame.exe!FRunnableThreadWin::GuardedRun() []
KERNEL32.DLL!UnknownFunction []
ntdll.dll!UnknownFunction []

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Unresolved
ComponentMedia Framework
Affects Versions5.3.2
Target Fix5.6
CreatedDec 20, 2023
UpdatedOct 9, 2024
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