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1. Get current camera list. 2022-06-23 11:00:42.300 CST : DEBUG : currentIDs = ["0x1421000025740901", "0x14241500046d0881"] 2. Unplug device(0x14241500046d0881), received the system notify(AVCaptureDeviceWasDisconnected) 2022-06-23 11:03:46.485 CST : DEBUG :onCameraDisconnected():get notification AVCaptureDeviceWasDisconnected 3. Get camera list: let currentIDs = AVCaptureDevice.devices(for: .video) 2022-06-23 11:03:46.485 CST : currentIDs = ["0x1421000025740901", "0x14241500046d0881"] Why AVCaptureDevice.devices(for: .video) return don't exist device(0x14241500046d0881)?

Under what circumstances will the private method of NSWindow _verifyDefaultButtonCell be called? This crash will appear in the MacOS10.15 system. Is there any good way to debug this? Can I directly hook this _verifyDefaultButtonCell to an empty implementation and stop the next message Forward? Crash dump 👇🏻: Time Awake Since Boot: 130000 seconds System Integrity Protection: enabled Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x000007ff13725458 Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [39562] VM Regions Near 0x7ff13725458: CoreAnimation 000000012a5ee000-000000012c5b4000 [ 31.8M] rw-/rwx SM=PRV --> MALLOC_NANO 0000600000000000-0000600008000000 [128.0M] rw-/rwx SM=ALI Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 libobjc.A.dylib 0x00007fff6dc2708c lookUpImpOrForward + 122 1 libobjc.A.dylib 0x00007fff6dc26b99 _objc_msgSend_uncached + 73 2 com.apple.AppKit 0x00007fff34c72a40 -[NSWindow _verifyDefaultButtonCell:] + 232 3 com.apple.AppKit 0x00007fff34c87f09 -[NSView _oldDisplayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 176 4 com.apple.AppKit 0x00007fff34bf706f -[NSView displayIfNeeded] + 755 5 com.apple.AppKit 0x00007fff34bf279f -[NSWindow displayIfNeeded] + 261 6 com.apple.AppKit 0x00007fff34bf25d3 __NSWindowGetDisplayCycleObserverForDisplay_block_invoke + 646 7 com.apple.AppKit 0x00007fff34bf0621 NSDisplayCycleObserverInvoke + 155 8 com.apple.AppKit 0x00007fff34bf01e8 NSDisplayCycleFlush + 977 9 com.apple.QuartzCore 0x00007fff4314c112 CA::Transaction::run_commit_handlers(CATransactionPhase) + 100 10 com.apple.QuartzCore 0x00007fff4314ae64 CA::Transaction::commit() + 224 11 com.apple.AppKit 0x00007fff34cace87 __62+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayLink]_block_invoke + 266 12 com.apple.AppKit 0x00007fff353c877d ___NSRunLoopObserverCreateWithHandler_block_invoke + 41 13 com.apple.CoreFoundation 0x00007fff379450ee __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23 14 com.apple.CoreFoundation 0x00007fff37945014 __CFRunLoopDoObservers + 457 15 com.apple.CoreFoundation 0x00007fff3794470b __CFRunLoopRun + 1219 16 com.apple.CoreFoundation 0x00007fff37943bd3 CFRunLoopRunSpecific + 499 17 com.apple.HIToolbox 0x00007fff3649a65d RunCurrentEventLoopInMode + 292 18 com.apple.HIToolbox 0x00007fff3649a39d ReceiveNextEventCommon + 600 19 com.apple.HIToolbox 0x00007fff3649a127 _BlockUntilNextEventMatchingListInModeWithFilter + 64 20 com.apple.AppKit 0x00007fff34b0beb4 _DPSNextEvent + 990 21 com.apple.AppKit 0x00007fff34b0a690 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352 22 com.apple.AppKit 0x00007fff34afc3ae -[NSApplication run] + 658 23 com.myapp.MacOS 0x0000000104ba0ed6 specialized thunk for @callee_guaranteed () -> (@error @owned Error) + 118 24 libswiftObjectiveC.dylib 0x00007fff6ec49f0e autoreleasepool<A>(invoking:) + 46 25 com.myapp.MacOS 0x0000000104ba0e53 main + 35 26 libdyld.dylib 0x00007fff6efa07fd start + 1

let volumePropertyAddress = AudioObjectPropertyAddress(         mSelector: kAudioHardwareServiceDeviceProperty_VirtualMainVolume,         mScope: kAudioDevicePropertyScopeOutput,         mElement: kAudioObjectPropertyElementMaster       )      let status = AudioObjectSetPropertyData(deviceId, &theAddress, 0, nil, size, &theValue) Then App freezes. Is it not possible to call the AudioObjectSetPropertyData method on the main thread

Using let address = AudioObjectPropertyAddress(    mSelector:kAudioHardwareServiceDeviceProperty_VirtualMainVolume,    mScope: kAudioObjectPropertyScopeOutput,    mElement: kAudioObjectPropertyElementMaster   ) Using Xcode13.1, App freezes. Tips: Using Xcode12, mSelector using kAudioHardwareServiceDeviceProperty_VirtualMasterVolume is worked.