Startup Movies Fail to Play when Audio Devices are Disabled

If a user launches a project in Standalone mode and has a Startup movie while the audio devices on the computer are disabled, the movie will fail to play.

As soon as you re-enable an audio device, the movie will play as expected.

This issue occurs in 4.9.2, 4.10.2, and 4.11 preview 4 binary releases.

1. Download and open the attached project.
2. Disable audio devices on your machine. (use image as reference)
3. Launch in Standalone.

Outcome - Startup movie will fail to play

Expected - Startup movie will play, even when there are no enabled audio devices.

Also test: With audio enabled, start playing video, mid video disable audio.
Before fix: Video freezes, game never loads.
After Fix: Video stops and game loads.

Fix UE-51650

Request a info about UE-127172 bug tracker

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