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Apple Developer Documentation

    https://developer.apple.com/documentation/audiotoolbox/1439763-audiooutputunitstart
    func AudioOutputUnitStart (_ ci: Audio Unit) -> OSStatus. Parameters ci. The I/O audio unit to start. Return Value. A result code. See Also. Starting and Stopping Output. func Audio Output Unit Stop (Audio Unit) -> OSStatus. Stops an I/O audio unit, which in turn stops the audio unit processing graph that it is connected to.

ios - Why does AudioOutputUnitStart() fail with return ...

    https://stackoverflow.com/questions/27892712/why-does-audiooutputunitstart-fail-with-return-code-500
    Activates the AVAudioSession. Instantiates an audio component instance. Sets properties of the audio unit, eg. a callback function and an AudioStreamDescription. Initializes the audio unit. But the program failes to start the recording - the AudioOutputUnitStart function failes with return code -500.

ios - AudioOutputUnitStart failed with OSStatus = -66637 ...

    https://stackoverflow.com/questions/35936989/audiooutputunitstart-failed-with-osstatus-66637-how-to-print-osstatus-from-c
    AudioOutputUnitStart failed with OSStatus = -66637 (How to print OSStatus from c++) Ask Question Asked 5 years, 10 months ago. Active 2 years, 4 months ago. Viewed 1k times 4 I faced with issue when the AudioOutputUnitStart failed on start recording. !!! I have already found the root cause without this returned code: it happens because of ...

Apple Developer Documentation

    https://developer.apple.com/documentation/audiotoolbox/1439763-audiooutputunitstart?preferredLanguage=occ
    OSStatus AudioOutputUnitStart (Audio Unit ci); Parameters ci. The I/O audio unit to start. Return Value. A result code. See Also. Starting and Stopping Output. Audio Output Unit Stop. Stops an I/O audio unit, which in turn stops the audio unit processing graph that it is connected to.

AudioOutputUnitStart producing error on d… - Apple Community

    https://discussions.apple.com/thread/2251087
    Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide …

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