Engine Version: 5.7.0 (Development Build) Language: English
The Issue: I am having two major issues with the Convai plugin in my project:
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System Crash: The editor is stable while playing, but the moment I hit ‘Escape’ to stop the PIE session, the engine freezes and crashes to desktop.
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Character Desync: When the project is running, the text-based response works perfectly (I see the question and answer in the UI), but the character remains static:
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No Lip-Sync: The character’s mouth does not move during responses.
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No Head Tracking: The character does not face the player.
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Audio/Visual Disconnect: It feels like the Convai logic is running, but it isn’t “talking” to the Character Blueprint or the Audio Mixer correctly.
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Relevant Log Data: The logs show a fatal error in the audio thread: LogWindows: Error: [Callstack] 0x00007ff86b9e4bc9 UnrealEditor-AudioMixer.dll!UnknownFunction [] LogWindows: Error: [Callstack] 0x00007ff8cfae74ee UnrealEditor-AudioMixerCore.dll!UnknownFunction []
Observations: It seems the Audio Mixer crash is preventing the procedural sound wave from playing, which in turn prevents the Lip-Sync (OVRLipSync/Convai LipSync) from receiving the phoneme data it needs to animate the mesh.
What I’ve Checked:
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Confirmed the Convai Chat Bot Component is attached to the Character.
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“Face Player” is enabled in the component settings, but it isn’t triggering.
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The language is set to English.
Question: Is there a specific setting in UE 5.7’s new audio architecture that needs to be toggled for Convai’s procedural audio to reach the character mesh? Has anyone else seen the character “ignore” the responses while the text logs work fine?