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[Voice Recognition] KeywordRecognizer Mutes in Player Builds: Fix Now!

Under Audit

build optimization

Unity 2021.3.x - Unity 6.x.x

Published 28 days ago

A common issue occurs where the KeywordRecognizer functions correctly within the Unity editor's playmode but fails to detect keywords in a standalone build. This typically points to build-specific configurations.

Issue

 The KeywordRecognizer fails to detect keywords exclusively when the application is deployed as a standalone build, while functioning as expected within the Unity editor's playmode. Investigations confirm that Microphone input is operational in the build, as demonstrated by successful audio playback from a dummy input. Both Microphone and InternetClient capabilities are enabled. The core problem lies with the KeywordRecognizer's inability to process phrases in the built application environment. The KeywordRecognizer initialization and event subscription are performed in the Awake() method.

Experimental Fixes
  • Ensure all necessary Microphone permissions are explicitly granted in the Player Settings for the target platform.
  • Verify that any associated native libraries or plugins required by the KeywordRecognizer are correctly included and configured for the build.
  • Check for differences in scripting backend settings (e.g., IL2CPP vs. Mono) between the editor and the build, as this can affect API compatibility.

Editor's Note:

The above fixes have not been verified by our audit team yet. They are provided exclusively for your own technical research. We recommend creating a backup of your project before proceeding with any attempts. Utilize at your own discretion!

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Content inspired by a Unity discussion post.