macOS App Using AVFoundation for Live Streaming scenarios to Handle Network Interruptions Gracefully
I've been banging my head against this for hours... I'm working on a macOS app that uses AVFoundation to stream video live from a camera. Everything works smoothly until there is a network interruption, at which point the video stops but the app doesn't handle the situation gracefully. Instead, I get the behavior `behavior Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed"` and the app crashes. I've implemented the streaming logic using `AVCaptureSession` and `AVAssetExportSession`. Here's a simplified version of my setup: ```swift import AVFoundation class Streamer { var captureSession: AVCaptureSession? var videoOutput: AVCaptureVideoDataOutput? func startStreaming() { captureSession = AVCaptureSession() let videoDevice = AVCaptureDevice.default(for: .video) guard let videoInput = try? AVCaptureDeviceInput(device: videoDevice!) else { return } captureSession?.addInput(videoInput) videoOutput = AVCaptureVideoDataOutput() captureSession?.addOutput(videoOutput!) captureSession?.startRunning() } } ``` I also have a network status observer using `NWPathMonitor` to check for internet connectivity, and I try to restart the session if the network is re-established. However, I'm not sure how to properly handle the interruption case when the network goes down. My current method of restarting the session is to simply call `startStreaming()` again, but this sometimes leads to a black screen or crashes. Here’s the snippet where I handle the network monitoring: ```swift import Network class NetworkMonitor { var monitor: NWPathMonitor init() { monitor = NWPathMonitor() monitor.pathUpdateHandler = { path in if path.status == .satisfied { print("We're connected!") // Attempt to restart streaming streamer.startStreaming() // This may cause issues } else { print("No connection.") } } let queue = DispatchQueue(label: "Monitor") monitor.start(queue: queue) } } ``` I need to ensure that my app can handle the interruption without crashing and resume streaming smoothly once the connection is back. Any suggestions on best practices for managing AVFoundation sessions during network interruptions or how to handle the behavior gracefully would be appreciated. Furthermore, are there specific configurations or behavior handling patterns I should implement to avoid this crash and ensure a seamless user experience? I'm working on a API that needs to handle this.