Hang Risk with Beethoven > InputSignalTracker.swift > start()

[curtinmjc]

When running GuitarTuner on multiple, different iOS devices (iPhone, iPad), there is a Hang Risk issue raised each time InputSignalTracker's start() method is called.

• line of code: 84
• code: captureSession.startRunning()
• issue: -[AVCaptureSession startRunning] should be called from background thread. Calling it on the main thread can lead to UI unresponsiveness
• Build Settings - Swift Language Version: Swift 5
• iOS Deployment Target: iOS 12.0
• Xcode Version: 14.2
• iPhone & iPad iOS Version: 16.2

This also happens with my own app when using Beethoven audio processing Swift library.

[lindezhen]

DispatchQueue.global(qos: .userInitiated).async {
self.captureSession.startRunning()
}