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Fixed in Unity 2018.1



Found in


Issue ID




[iOS] Minimizing app during its initialization breaks the sound, error "FMOD failed to initialize the output device" displayed




Priority: 3Not yet prioritized for a release


Severity: 3Secondary functionality broken

Steps to reproduce:
1. Open user's attached project
2. Build "Test" scene to iOS platform
3. In Xcode, Build and Run
4. When app starts launching in iOS, instantly click home button
5. Notice that debug console has this error: "FMOD failed to initialize the output device, attempting to initialize the null output."
6. Bring back the app to foreground

Expected results: No error, sound plays
Actual results: Error mentioned in step 5, no sound playing

Reproduced on: 5.4.5p1, 5.5.4p1, 5.6.2f1, 2017.1.0f1, 2017.2.0b1

* Issue reproduces with and without developer mode enabled in build settings
* Opening the app through iOS device instead of Xcode does not reproduce the issue

This bug cannot be completely fixed. FMOD initialization failed when an application is being sent to the background. With this fix, FMOD would be automatically reinitialized after bringing an application back to the foreground. However sounds will not be restarted, unfortunately, this is simply impossible with current FMOD based architecture. Developers should subscribe to the OnAudioConfigurationChanged event to restore sounds manually.

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