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“Popping Sound”

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Reply to How to hide route button `showsRouteButton = false` in `MPVolumeView` without deprecation warning?
Thank you for a quick reply. We are using non-deprecated MPVolumeView (https://developer.apple.com/documentation/mediaplayer/mpvolumeview) to control system audio output volume. // volumeView is `MPVolumeView` volumeView.showsRouteButton = false volumeView.backgroundColor = .clear addSubview(volumeView) volumeView.snp.makeConstraints { make in make.top.greaterThanOrEqualTo(self) make.bottom.lessThanOrEqualTo(self) make.centerY.equalToSuperview() make.leading.equalTo(volumeMuteImageView.snp.trailing).offset(6). make.trailing.equalTo(volumeHighImageView.snp.leading).offset(-15) make.height.equalTo(44) } What should we do? Thank you!
Topic: Media Technologies SubTopic: Audio Tags:
5d
Reply to ScreenCaptureKit System Audio Capture Crashes with EXC_BAD_ACCESS
I have hit this exact crash pattern in my own ScreenCaptureKit audio capture pipeline. The EXC_BAD_ACCESS in swift_getErrorValue happens because the error object passed to didStopWithError is being deallocated before the delegate method can access it — it is a race condition in the XPC boundary between replayd and your process. The root cause in my case was that the SCStream object was being deallocated (or stopCapture was called) while a pending error was being delivered across the XPC connection. The error object lives in replayd's address space and gets bridged to your process, but if the stream tears down mid-delivery, you get a dangling pointer. Keep a strong reference to the SCStream instance beyond the point where you call stopCapture. Do not nil it out immediately. In your stream delegate, wrap the didStopWithError handler in a DispatchQueue.main.async to ensure the error is fully materialized before you access it: func stream(_ stream: SCStream, didStopWithError error: Error) { let errorDesc
Topic: Media Technologies SubTopic: Audio Tags:
5d
Reply to Mixing ScreenCaptureKit audio with microphone audio
I ran into exactly this problem when building an audio pipeline that mixes system audio (via ScreenCaptureKit) with microphone input for real-time speech processing. The core issue is that mainMixerNode is connected to outputNode by default, which routes everything to speakers. You have two approaches: In manual rendering mode, AVAudioEngine does not play back to hardware — you pull rendered buffers on your own schedule. Enable manual rendering, attach a player node for your SCK audio, connect it to the main mixer, then call renderOffline() to pull mixed audio on demand. The catch: inputNode does not work in offline mode on macOS. The workaround is to capture mic samples separately (via AVCaptureSession or a tap on a separate realtime engine), then schedule those buffers into a second AVAudioPlayerNode. Keep the engine in realtime mode but prevent playback by setting mainMixerNode.outputVolume = 0. Then install a tap on mainMixerNode to capture the mixed audio with
Topic: Media Technologies SubTopic: Audio Tags:
5d
Reply to CoreData + CloudKit -- Many-to-Many Relationship not Syncing
This sounds like a general synchronization issue, and so you can probably start with the technotes mentioned in this post to hopefully figure out the cause of the issue. NSPersistentCloudKitContainer supports many-to-many relationships. Before seeing an evidence that proves it doesn't work (by going through the debugging process the technotes describe), I probably won't change the Core Data model. Best, —— Ziqiao Chen  Worldwide Developer Relations.
Topic: App & System Services SubTopic: iCloud & Data Tags:
5d
Reply to copyfile Sometimes Fails to copy .DS_Store when Copying a Folder But Does Not Report Usable Error
So it appears to be the same failure we are talking about here: https://developer.apple.com/forums/thread/814076 I just updated that thread, but the bug described there (FB21805212) was fixed in macOS 26.4. Also, to be clear, the bug was specifically in smb, NOT copyfile itself. However... It has data. I can read the filenames when I view it as 'plain text’. The Resource fork is less than 300 bytes, but that is enough for it to cause copyfile to fail. The total file size is ~12kb. That doesn't sound like the bug above. The bug above was caused by the SMBClient incorrectly accounting for large xattr size, which then caused the copy to fail. I don't think it would have happened with small xattrs (certainly not 300 bytes). FYI, the Finder (and other copy engines) work because they're using the ..namedfork accessor, when it ends up going through a totally different code path in smb. Interestingly, .DS_Store causing problems with copying is infamous enough to have a mention on Wikipedia: Yes, but I think
Topic: App & System Services SubTopic: Core OS Tags:
5d
App review rejection due to accessibility
Hi, and apologies for a long post! We have created an app that enables wireless communication with FIDO2 devices over Bluetooth by creating virtual HID devices and translating the packages. In order to do this, we use the HIDVirtualDevice class as described here: https://developer.apple.com/documentation/corehid/creatingvirtualdevices We learned the hard way that this sample code does not work without the “com.apple.developer.hid.virtual.device“ entitlement, but with it, it behaves as expected. Now, our application has been rejected during Review, both by the initial App Review and the appeal to the App Review Board. The problem is that I can’t really figure out what the issue is. The first rejection states the following: The app requests access to Accessibility features on macOS but does not use these features for accessibility purposes. Specifically, the app uses Accessibility features for non-accessibility feature. (Please see attached screenshot) The attached screenshot is of the screen the app shows when
Topic: App Store Distribution & Marketing SubTopic: App Review Tags:
0
0
26
5d
Reply to Working Anti Virus - Apple Developer Account terminated
Hi, I read your post and it sounds like an incredibly tough situation. I’ve been through a Pending Termination Notice myself, so I truly understand how stressful this can be. I’d like to share my experience just in case it might be of some help. At this stage, it might be more effective to focus less on defending the anti-virus app’s innovation and more on protecting your developer account and your livelihood. In my own case, focusing on a few specific points in my appeal seemed to make a difference: Clarify your intent: Since the app was flagged as malicious, you might want to clearly explain that you had absolutely no intention of misleading users. While your personal situation (such as losing your source of income) is completely understandable, Apple’s review process is guideline-driven, so I think it might be more effective to keep the tone as professional as possible. Write a concrete preventative measure: I mentioned this in another thread recently, but I believe including a clear preventative
Topic: App Store Distribution & Marketing SubTopic: App Review Tags:
6d
Reply to sysextd: "no policy, cannot allow apps outside /Applications" - NEFilterDataProvider system extension on macOS 26
It sounds like you’re using Developer ID signing for day-to-day development. That’s a mistake on multiple levels. I talk about this in general in The Care and Feeding of Developer ID, but there are extra issues with system extensions, where system policy requires that Developer ID signed sysexen be notarised. So my advice in this case. Use Apple Development code signing for day-to-day development. Use Developer ID for pre-release testing and distribution. There are a couple of key benefits with this approach: It lets you build and debug without enabling development mode, which is a big win IMO. Xcode’s automatic code signing works well with Apple Development signing. Even if you’re not using Xcode, you can create a small test project in Xcode, get it working, and then follow the same path it took. See Debugging a Network Extension Provider for specific advice on how to bring up a provider in Xcode. One thing that Xcode doesn’t handle is the -systemextension suffix )-: To learn more about that, read E
Topic: App & System Services SubTopic: Networking Tags:
6d
Reply to CKQuerySubscription on public database never triggers APNS push in Production environment
Hi Ziqiao, thanks for looking into this! I've verified using CKFetchSubscriptionsOperation.fetchAllSubscriptionsOperation() on both Development and Production (TestFlight) devices. All 5 subscriptions are present and correctly configured in both environments. The output is identical between both environments. Here are all 5 subscriptions as returned by CKFetchSubscriptionsOperation: fr-sub-v3 (FriendRequest) Predicate: receiverID == [userID] AND status == pending badge=true, sound=default, contentAvail=false locKey=FRIEND_REQUEST_BODY, locArgs=[senderUsername] category=FRIEND_REQUEST, desiredKeys=[senderID, senderUsername] rec-sub-v3 (MediaRecommendation) Predicate: receiverID == [userID] AND status == pending badge=true, sound=default, contentAvail=false locKey=RECOMMENDATION_BODY, locArgs=[senderUsername, mediaTitle] category=RECOMMENDATION, desiredKeys=[mediaTitle, mediaType, senderID, senderUsername] fs-a-sub-v3 (Friendship) Predicate: userAID == [userID] badge=true, sound=defau
Topic: App & System Services SubTopic: iCloud & Data Tags:
6d
Reply to SpeechTranscriber/SpeechAnalyzer being relatively slow compared to FoundationModel and TTS
I've been optimizing a similar STT-to-action pipeline on macOS 26 and found a few additional tricks beyond prepareToAnalyze that helped bring the finalization latency down: Use volatileResults aggressively for UI feedback, but trigger your downstream action (FoundationModel call) on the volatile transcript as soon as it stabilizes — don't wait for the finalized event. In my testing, the volatile transcript matches the final one ~95% of the time for short utterances. You can always correct if the final differs. Audio format matters more than you'd expect. If your input is coming through at 48kHz (common from ScreenCaptureKit or external mics), the internal resample to 16kHz adds measurable overhead. Setting up your AVAudioEngine tap at 16kHz mono from the start shaves ~200ms off the pipeline. The large variance Bersaelor observed with prepareToAnalyze (0.05s to 3s) likely correlates with whether the ANE was already warm. If other CoreML workloads are running concurrently (even system ones like Visual
Topic: Media Technologies SubTopic: Audio Tags:
6d
In-App Provisioning: cannot add card to a wallet
We are developing an app which allows users to generate a HSBC virtual card using Mastercard API and add this card to an apple wallet. Staging test was passed successfully, but we are stuck in a production test phase. T&C is not even visible, 'Card is not added' is popped on a screen before that. User taps “Add to Apple Wallet” → we present PKAddPaymentPassViewController → they tap Next → after a few seconds the flow fails with Set Up Later alert. FB22332303 (MCDeanPortal app: In-App Provisioning Production Test fails) Thank you
Topic: App & System Services SubTopic: Apple Pay
0
0
44
1w
Reply to CoreML regression between macOS 26.0.1 and macOS 26.1 Beta causing scrambled tensor outputs
I've been working with CoreML extensively across macOS 26.x betas and can confirm this regression affects audio processing models as well, not just diffusion architectures. After investigating with Metal GPU capture, the pattern strongly suggests a stride alignment issue in the MLMultiArray backing store when the compute unit dispatches to GPU/ANE. Here are the workarounds I've found while waiting for an official fix: Force CPU-only execution as a temporary fix: let config = MLModelConfiguration() config.computeUnits = .cpuOnly let model = try MyModel(configuration: config) This avoids the corrupted GPU/ANE path entirely. Performance takes a hit, but results are correct. If you need GPU performance, pin to CPU+GPU and avoid the ANE: config.computeUnits = .cpuAndGPU // excludes Neural Engine In my testing, the corruption is most severe on the ANE path. CPU+GPU gives roughly 70% of the full .all performance without the scrambled outputs. Runtime validation to degrade gracefully across OS versions: func
Topic: Machine Learning & AI SubTopic: Core ML Tags:
1w
Reply to How to hide route button `showsRouteButton = false` in `MPVolumeView` without deprecation warning?
Like the documentation explains to control the audio for that control use AVRoutePickerView Thanks Albert 
  Worldwide Developer Relations.
Topic: Media Technologies SubTopic: Audio Tags:
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5d
Reply to How to hide route button `showsRouteButton = false` in `MPVolumeView` without deprecation warning?
Thank you for a quick reply. We are using non-deprecated MPVolumeView (https://developer.apple.com/documentation/mediaplayer/mpvolumeview) to control system audio output volume. // volumeView is `MPVolumeView` volumeView.showsRouteButton = false volumeView.backgroundColor = .clear addSubview(volumeView) volumeView.snp.makeConstraints { make in make.top.greaterThanOrEqualTo(self) make.bottom.lessThanOrEqualTo(self) make.centerY.equalToSuperview() make.leading.equalTo(volumeMuteImageView.snp.trailing).offset(6). make.trailing.equalTo(volumeHighImageView.snp.leading).offset(-15) make.height.equalTo(44) } What should we do? Thank you!
Topic: Media Technologies SubTopic: Audio Tags:
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Views
Activity
5d
Reply to ScreenCaptureKit System Audio Capture Crashes with EXC_BAD_ACCESS
I have hit this exact crash pattern in my own ScreenCaptureKit audio capture pipeline. The EXC_BAD_ACCESS in swift_getErrorValue happens because the error object passed to didStopWithError is being deallocated before the delegate method can access it — it is a race condition in the XPC boundary between replayd and your process. The root cause in my case was that the SCStream object was being deallocated (or stopCapture was called) while a pending error was being delivered across the XPC connection. The error object lives in replayd's address space and gets bridged to your process, but if the stream tears down mid-delivery, you get a dangling pointer. Keep a strong reference to the SCStream instance beyond the point where you call stopCapture. Do not nil it out immediately. In your stream delegate, wrap the didStopWithError handler in a DispatchQueue.main.async to ensure the error is fully materialized before you access it: func stream(_ stream: SCStream, didStopWithError error: Error) { let errorDesc
Topic: Media Technologies SubTopic: Audio Tags:
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Activity
5d
Reply to Mixing ScreenCaptureKit audio with microphone audio
I ran into exactly this problem when building an audio pipeline that mixes system audio (via ScreenCaptureKit) with microphone input for real-time speech processing. The core issue is that mainMixerNode is connected to outputNode by default, which routes everything to speakers. You have two approaches: In manual rendering mode, AVAudioEngine does not play back to hardware — you pull rendered buffers on your own schedule. Enable manual rendering, attach a player node for your SCK audio, connect it to the main mixer, then call renderOffline() to pull mixed audio on demand. The catch: inputNode does not work in offline mode on macOS. The workaround is to capture mic samples separately (via AVCaptureSession or a tap on a separate realtime engine), then schedule those buffers into a second AVAudioPlayerNode. Keep the engine in realtime mode but prevent playback by setting mainMixerNode.outputVolume = 0. Then install a tap on mainMixerNode to capture the mixed audio with
Topic: Media Technologies SubTopic: Audio Tags:
Replies
Boosts
Views
Activity
5d
Reply to CoreData + CloudKit -- Many-to-Many Relationship not Syncing
This sounds like a general synchronization issue, and so you can probably start with the technotes mentioned in this post to hopefully figure out the cause of the issue. NSPersistentCloudKitContainer supports many-to-many relationships. Before seeing an evidence that proves it doesn't work (by going through the debugging process the technotes describe), I probably won't change the Core Data model. Best, —— Ziqiao Chen  Worldwide Developer Relations.
Topic: App & System Services SubTopic: iCloud & Data Tags:
Replies
Boosts
Views
Activity
5d
Reply to copyfile Sometimes Fails to copy .DS_Store when Copying a Folder But Does Not Report Usable Error
So it appears to be the same failure we are talking about here: https://developer.apple.com/forums/thread/814076 I just updated that thread, but the bug described there (FB21805212) was fixed in macOS 26.4. Also, to be clear, the bug was specifically in smb, NOT copyfile itself. However... It has data. I can read the filenames when I view it as 'plain text’. The Resource fork is less than 300 bytes, but that is enough for it to cause copyfile to fail. The total file size is ~12kb. That doesn't sound like the bug above. The bug above was caused by the SMBClient incorrectly accounting for large xattr size, which then caused the copy to fail. I don't think it would have happened with small xattrs (certainly not 300 bytes). FYI, the Finder (and other copy engines) work because they're using the ..namedfork accessor, when it ends up going through a totally different code path in smb. Interestingly, .DS_Store causing problems with copying is infamous enough to have a mention on Wikipedia: Yes, but I think
Topic: App & System Services SubTopic: Core OS Tags:
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Views
Activity
5d
App review rejection due to accessibility
Hi, and apologies for a long post! We have created an app that enables wireless communication with FIDO2 devices over Bluetooth by creating virtual HID devices and translating the packages. In order to do this, we use the HIDVirtualDevice class as described here: https://developer.apple.com/documentation/corehid/creatingvirtualdevices We learned the hard way that this sample code does not work without the “com.apple.developer.hid.virtual.device“ entitlement, but with it, it behaves as expected. Now, our application has been rejected during Review, both by the initial App Review and the appeal to the App Review Board. The problem is that I can’t really figure out what the issue is. The first rejection states the following: The app requests access to Accessibility features on macOS but does not use these features for accessibility purposes. Specifically, the app uses Accessibility features for non-accessibility feature. (Please see attached screenshot) The attached screenshot is of the screen the app shows when
Topic: App Store Distribution & Marketing SubTopic: App Review Tags:
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0
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0
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26
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5d
After upgrade to iOS 26.4, averagePowerLevel and peakHoldLevel are stuck -120
We have an application that capture audio and video. App captures audio PCM on internal or external microphone and displays audio level on the screen. App was working fine for many years but after iOS 26.4 upgrade, averagePowerLevel and peakHoldLevel are stuck to -120 values. Any suggestion?
Topic: Media Technologies SubTopic: Audio Tags:
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3
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0
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205
Activity
6d
Reply to Working Anti Virus - Apple Developer Account terminated
Hi, I read your post and it sounds like an incredibly tough situation. I’ve been through a Pending Termination Notice myself, so I truly understand how stressful this can be. I’d like to share my experience just in case it might be of some help. At this stage, it might be more effective to focus less on defending the anti-virus app’s innovation and more on protecting your developer account and your livelihood. In my own case, focusing on a few specific points in my appeal seemed to make a difference: Clarify your intent: Since the app was flagged as malicious, you might want to clearly explain that you had absolutely no intention of misleading users. While your personal situation (such as losing your source of income) is completely understandable, Apple’s review process is guideline-driven, so I think it might be more effective to keep the tone as professional as possible. Write a concrete preventative measure: I mentioned this in another thread recently, but I believe including a clear preventative
Topic: App Store Distribution & Marketing SubTopic: App Review Tags:
Replies
Boosts
Views
Activity
6d
Reply to sysextd: "no policy, cannot allow apps outside /Applications" - NEFilterDataProvider system extension on macOS 26
It sounds like you’re using Developer ID signing for day-to-day development. That’s a mistake on multiple levels. I talk about this in general in The Care and Feeding of Developer ID, but there are extra issues with system extensions, where system policy requires that Developer ID signed sysexen be notarised. So my advice in this case. Use Apple Development code signing for day-to-day development. Use Developer ID for pre-release testing and distribution. There are a couple of key benefits with this approach: It lets you build and debug without enabling development mode, which is a big win IMO. Xcode’s automatic code signing works well with Apple Development signing. Even if you’re not using Xcode, you can create a small test project in Xcode, get it working, and then follow the same path it took. See Debugging a Network Extension Provider for specific advice on how to bring up a provider in Xcode. One thing that Xcode doesn’t handle is the -systemextension suffix )-: To learn more about that, read E
Topic: App & System Services SubTopic: Networking Tags:
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6d
Reply to The audio of FairPlay protected content can be captured - Safari on iOS
Hi, I would appreciate any feedback - either confirming or contradicting our observation above, that Audio cannot be protected from being captured on Safari/iOS. Thanks.
Topic: Media Technologies SubTopic: Streaming Tags:
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6d
Reply to CKQuerySubscription on public database never triggers APNS push in Production environment
Hi Ziqiao, thanks for looking into this! I've verified using CKFetchSubscriptionsOperation.fetchAllSubscriptionsOperation() on both Development and Production (TestFlight) devices. All 5 subscriptions are present and correctly configured in both environments. The output is identical between both environments. Here are all 5 subscriptions as returned by CKFetchSubscriptionsOperation: fr-sub-v3 (FriendRequest) Predicate: receiverID == [userID] AND status == pending badge=true, sound=default, contentAvail=false locKey=FRIEND_REQUEST_BODY, locArgs=[senderUsername] category=FRIEND_REQUEST, desiredKeys=[senderID, senderUsername] rec-sub-v3 (MediaRecommendation) Predicate: receiverID == [userID] AND status == pending badge=true, sound=default, contentAvail=false locKey=RECOMMENDATION_BODY, locArgs=[senderUsername, mediaTitle] category=RECOMMENDATION, desiredKeys=[mediaTitle, mediaType, senderID, senderUsername] fs-a-sub-v3 (Friendship) Predicate: userAID == [userID] badge=true, sound=defau
Topic: App & System Services SubTopic: iCloud & Data Tags:
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Activity
6d
Reply to SpeechTranscriber/SpeechAnalyzer being relatively slow compared to FoundationModel and TTS
I've been optimizing a similar STT-to-action pipeline on macOS 26 and found a few additional tricks beyond prepareToAnalyze that helped bring the finalization latency down: Use volatileResults aggressively for UI feedback, but trigger your downstream action (FoundationModel call) on the volatile transcript as soon as it stabilizes — don't wait for the finalized event. In my testing, the volatile transcript matches the final one ~95% of the time for short utterances. You can always correct if the final differs. Audio format matters more than you'd expect. If your input is coming through at 48kHz (common from ScreenCaptureKit or external mics), the internal resample to 16kHz adds measurable overhead. Setting up your AVAudioEngine tap at 16kHz mono from the start shaves ~200ms off the pipeline. The large variance Bersaelor observed with prepareToAnalyze (0.05s to 3s) likely correlates with whether the ANE was already warm. If other CoreML workloads are running concurrently (even system ones like Visual
Topic: Media Technologies SubTopic: Audio Tags:
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Views
Activity
6d
In-App Provisioning: cannot add card to a wallet
We are developing an app which allows users to generate a HSBC virtual card using Mastercard API and add this card to an apple wallet. Staging test was passed successfully, but we are stuck in a production test phase. T&C is not even visible, 'Card is not added' is popped on a screen before that. User taps “Add to Apple Wallet” → we present PKAddPaymentPassViewController → they tap Next → after a few seconds the flow fails with Set Up Later alert. FB22332303 (MCDeanPortal app: In-App Provisioning Production Test fails) Thank you
Topic: App & System Services SubTopic: Apple Pay
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0
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0
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44
Activity
1w
Reply to CoreML regression between macOS 26.0.1 and macOS 26.1 Beta causing scrambled tensor outputs
I've been working with CoreML extensively across macOS 26.x betas and can confirm this regression affects audio processing models as well, not just diffusion architectures. After investigating with Metal GPU capture, the pattern strongly suggests a stride alignment issue in the MLMultiArray backing store when the compute unit dispatches to GPU/ANE. Here are the workarounds I've found while waiting for an official fix: Force CPU-only execution as a temporary fix: let config = MLModelConfiguration() config.computeUnits = .cpuOnly let model = try MyModel(configuration: config) This avoids the corrupted GPU/ANE path entirely. Performance takes a hit, but results are correct. If you need GPU performance, pin to CPU+GPU and avoid the ANE: config.computeUnits = .cpuAndGPU // excludes Neural Engine In my testing, the corruption is most severe on the ANE path. CPU+GPU gives roughly 70% of the full .all performance without the scrambled outputs. Runtime validation to degrade gracefully across OS versions: func
Topic: Machine Learning & AI SubTopic: Core ML Tags:
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1w