Hello Apple Developer community, I'm building an Apple Music client for HarmonyOS (Huawei's operating system) and would like to clarify the licensing and technical approach before submitting to a third-party app store (Huawei AppGallery). I've read the Apple Developer Program License Agreement and App Store Review Guideline 4.5.2, but there are platform-specific constraints I'd like to discuss. Background Apple currently does not provide a MusicKit SDK for HarmonyOS. The available options are: MusicKit for iOS/macOS — not applicable (different OS) MusicKit for Android — ships as proprietary .aar binaries that cannot be redistributed and are not compatible with HarmonyOS's runtime MusicKit JS — available, but HarmonyOS WebView does not support FairPlay or Widevine EME, so full-song DRM playback through MusicKit JS does not work on this platform The only Apple Music API access path available to a HarmonyOS app is the REST API (api.music.apple.com) with a Developer Token (JWT, ES256) and a Music User Token obtained through the MusicKit JS authorization flow running inside a WebView. The technical constraint To deliver full-song playback for subscribed Apple Music users on HarmonyOS, our app retrieves the HLS playback URL via the Apple Music API, downloads the encrypted media segments, and decrypts them using HarmonyOS's native DRM system (WisePlay, the only CDM available on the platform). MusicKit JS's FairPlay/Widevine CDM is not compatible with HarmonyOS — WisePlay is the sole DRM implementation the OS exposes. We are aware that Section 4.5.2 states: "You may not, and You may not permit Your end users to, download, upload, or modify any MusicKit Content" and "You may play MusicKit Content only as rendered by the MusicKit APIs or MusicKit JS" What we want to clarify Our playback implementation works as follows, and we want to confirm whether it is acceptable under the license terms: No download service is offered to users. The download is purely an internal playback mechanism — the app fetches encrypted segments, decrypts them in memory / a protected sandbox, and plays them via the system AVPlayer. There is no "download button," no offline library, no user-facing download feature. Decrypted files are ephemeral and protected. Decrypted media is written to the app's private sandbox (not accessible to users or other apps), played immediately, and deleted as soon as playback ends or the song is skipped. The decrypted file never persists beyond the current playback session. No file leakage. The decrypted content is never exposed via any sharing mechanism, file picker, or external storage. It exists only within the app's protected data directory for the duration of playback. Standard playback controls are preserved. Users initiate playback and can use play / pause / skip / seek — the same controls required by 4.5.2(i). No monetization of Apple Music access. The app does not charge for Apple Music playback, does not show ads around it, and does not collect or share user data. Our question Given that: Apple has no SDK presence on HarmonyOS, MusicKit JS DRM is technically non-functional on HarmonyOS WebView, the only way to deliver full-song playback to Apple Music subscribers on this platform is to decrypt the stream using the OS's native DRM (WisePlay) with strict ephemeral handling, is this playback approach acceptable under the Apple Developer Program License Agreement, provided that: decrypted content is never persisted, shared, or exposed to users, the app only serves subscribed Apple Music users with valid Music User Tokens, all usage remains within the scope of facilitating access to the user's own Apple Music subscription? We fully respect Apple's content protection requirements and are happy to adjust the implementation (e.g., stricter deletion timing, additional sandboxing, attestation) to comply. We just want to understand whether the fundamental approach — decrypting via the host OS's DRM because Apple's own CDMs are unavailable on this platform — is permissible, or whether Apple considers HarmonyOS out of scope for full-song playback entirely. Any guidance from the MusicKit team or community members who have dealt with non-Apple-platform constraints would be greatly appreciated. Thank you.

Hello, I am an independent developer in Argentina building an app for rideshare drivers, and I would like to know what the supported approach is on iOS before I build the wrong thing. The problem When a trip offer appears, the driver sees a fare, a distance and a duration. What they do not see is what is left after the cost of running their own car — fuel, maintenance, and very often the weekly rent they pay for the vehicle. Here those costs are high and change constantly, and drivers routinely accept trips that lose them money without realising it. They have about three seconds to decide, while driving. Our app reads the numbers already visible on the driver's own screen, subtracts that particular driver's cost per kilometre, and shows one figure: what this trip actually leaves them per hour. In our own field measurements with two drivers over several weeks, being able to see that number raised their hourly earnings and — just as important — kept their eyes off mental arithmetic at the wheel. What we will not do, on purpose I want to be explicit about this, because I know other tools in this category cut corners: We never ask for the driver's Uber or DiDi username or password, and we never connect to or automate their account. Some tools do, and that puts the driver's account — their livelihood — at risk of deactivation. We will not build that. We never accept or decline a trip for the driver. The decision and the tap are always theirs. We never store passenger data: no name, no rating, no photo, no exact address. Text recognition runs entirely on device, offline. The captured image is discarded immediately and never leaves the phone or reaches any server. No advertising, no data sales, no third-party trackers. The app does not read anything the driver is not already looking at, it only reads while the driver has explicitly turned it on for their shift, and it exists for one purpose: so that someone working long hours knows what an hour of their work is actually worth. My question On Android this is done with MediaProjection, with explicit user consent each session and a persistent system indicator. On iOS I understand a Broadcast Upload Extension is not intended for background processing, and that there is no overlay across apps. Is there any supported path on iOS for an app to read, with the user's explicit and repeated consent, text the user is already looking at on their own screen, in order to give that same user an immediate assessment of their own work? Accessibility APIs, a system extension point, anything. If there is no supported path, I would rather know now and design the iOS version around what is allowed, instead of shipping something that gets rejected or that quietly breaks the rules. Thank you.

Hi, I’m developing an iOS app that captures the user’s voice and sends the microphone input to an AI model for speech processing. For this use case, Voice Isolation provides a significantly better input signal in noisy environments. However, I’m currently unable to enable Voice Isolation programmatically when the app starts recording. As I understand it, microphone modes such as Automatic, Standard, Voice Isolation, and Wide Spectrum are controlled by the user through the system UI. My app can detect/observe the current microphone mode, but I have not found a public API that allows the app to select Voice Isolation itself. My questions are: Is there currently a supported public API to programmatically switch the microphone mode from Automatic/Standard → Voice Isolation? If direct selection is not supported, is there a recommended way for an app that primarily processes speech/voice input for an AI model to request or prefer Voice Isolation? Would using AVAudioSession with an appropriate voice-processing configuration, such as .voiceChat, or enabling voice processing through AVAudioEngine, provide equivalent Voice Isolation processing? Is AVCaptureDevice.showSystemUserInterface(.microphoneModes) the intended approach when an app needs the user to change the microphone mode? I understand that Apple may intentionally keep microphone-mode selection under user control. I’m mainly trying to determine whether there is a supported programmatic approach that I may have overlooked, rather than relying on a custom noise-suppression implementation. Any guidance on the recommended architecture for this use case would be greatly appreciated. Thank you!

We are seeking assistance regarding an ongoing issue with FairPlay Streaming (FPS) certificates in our Apple Developer account. We are currently unable to generate a new FairPlay Streaming certificate because the Apple Developer portal displays: “Maximum number of certificates generated” The FairPlay Streaming Certificate option is disabled, and there is no option available to generate a new certificate. We have also checked our existing FairPlay Streaming certificates. When opening an existing certificate, the certificate details page only provides a Download option. There is no option to Revoke, Delete, or Remove the existing FairPlay Streaming certificate. We have attached screenshots showing: The FairPlay Streaming Certificate section displaying “Maximum number of certificates generated.” An existing FairPlay Streaming Certificate showing only the Download option, with no option to revoke or delete it. The FairPlay Streaming Test Certificate option showing that we are not allowed to perform the operation and should contact Apple Developer Program Support. Account information: Entity Name: DIGIZION PRIVATE LIMITED Team ID: HK7FAN55HP Certificate Type: FairPlay Streaming Certificate Name: DIGIZION PRIVATE LIMITED Certificate Expiration: Never The reason we need a new FairPlay Streaming certificate is that our server infrastructure experienced a crash. As a result, we permanently lost the private keys and certificate-related credentials associated with our previous FairPlay Streaming setup. Unfortunately, we did not have a backup of these private keys. Because the private keys were lost, we are unable to use the existing certificate credentials with our new server infrastructure. We therefore need to generate a new FairPlay Streaming certificate and configure our production DRM infrastructure again. However, we are currently blocked because the certificate generation limit has been reached, while the Apple Developer portal does not provide us with any option to revoke, delete, or remove an existing FairPlay Streaming certificate. We have already submitted approximately 10 support requests/messages to Apple regarding this same issue, but we have not received a response providing a solution or instructions for resolving the certificate limit issue. Could someone from Apple Developer Support or the FairPlay Streaming team please review this issue and advise us on how we can resolve it? We would greatly appreciate assistance with one of the following: Revoke/remove an existing FairPlay Streaming certificate so that we can generate a new certificate; or Reset or increase the FairPlay Streaming certificate generation limit for our Team ID; or Provide the correct procedure or an Apple-side solution that will allow us to generate a new FairPlay Streaming certificate. We understand that FairPlay Streaming certificates may have certificate-generation limitations. However, in our situation, the previous server crash resulted in the permanent loss of our private keys, and we have no backup from which we can recover them. This issue is currently blocking our production DRM/FairPlay Streaming integration and preventing us from completing our production infrastructure setup. We would therefore greatly appreciate it if Apple Developer Support could review Team ID HK7FAN55HP and help us either revoke an existing certificate or reset/increase the certificate generation limit so that we can generate a new FairPlay Streaming certificate. Thank you for your time and assistance.

I have both apple devices, AirPods Pro 3 is up to date and Ultra 3 is on watch os 26.1 latest public beta. Each morning when I would go on my mindfulness app and start a meditation or listen to Apple Music on my watch and AirPods Pro 3, it will play for a few seconds then disconnects. My bluetooth settings on my watch says my AirPods is connected to my watch. I also have removed the tick about connecting automatically to iPhone on the AirPods setting in my iPhone. To fix this I invariably turn off my Apple Watch Ultra 3 and turn it on again. Then the connection becomes stable. I am not sure why I have to do this each morning. It is frustrating. I am not sure why this fix does not last long? Is there something wrong with my AirPods? Has anyone encountered this before?

The documentation for AVCaptureDevice.uniqueID states the following: Capture devices have a unique identifier that persists on one system across device connections and disconnections, application restarts, and reboots of the system itself. You can store the value returned by this property to recall or track the status of a specific device in the future. For UVC capture devices this documentation does not hold. The video uniqueID is a hex string of the form 0x<locationID><vendorID><productID>, and the identifying half is the locationID (bus number plus port path). Which identifies a port, not a device. I ran a suite of tests with three identical Elgato 4K X capture cards connected to a Mac Studio w/ M3 Ultra running macOS 26.5.2, and reproduced my findings on a MacBook w/ M3 Pro (same macOS version). See the script at the bottom of the post for how uniqueId & USB serial number are being retrieved. 1. The uniqueID follows the port. Swapping two cards between two built-in ports swaps their uniqueIDs: # Before swap. 4K X uid=0x2000000fd9009b serial=A7SNB50424UBQI 4K X uid=0x12000000fd9009b serial=A7SNB504219J0R # After swapping the cards between the same two ports. 4K X uid=0x2000000fd9009b serial=A7SNB504219J0R 4K X uid=0x12000000fd9009b serial=A7SNB50424UBQI An app that stored 0x2000000fd9009b to recall a specific capture card now silently opens another. 2. A reboot alone can swap uniqueIDs. External USB controllers (here, PCIe USB cards in two Thunderbolt enclosures) can race for bus numbers at boot, so with every cable left in place, a reboot swapped two of the cards: # Before reboot. 4K X uid=0x262000000fd9009b serial=A7SNB504219J0R 4K X uid=0x252000000fd9009b serial=A7SNB50423R73R # After reboot, no cables touched. 4K X uid=0x262000000fd9009b serial=A7SNB50423R73R 4K X uid=0x252000000fd9009b serial=A7SNB504219J0R This behavior is intermittent, a second reboot changed nothing, but a third caused another swap. Cards left alone in built-in ports retain their uniqueIDs across reboots in my testing; the failure requires dynamically enumerated external USB controllers. 3. Even the product ID tail can drift. One unit intermittently enumerates with idProduct 0x009c instead of 0x009b, same port (USB PCIe card in a Thunderbolt enclosure), cables untouched: # Before reboot. 4K X uid=0x222000000fd9009b serial=A7SNB50424UBQI # After reboot. 4K X uid=0x222000000fd9009c serial=A7SNB50424UBQI IOKit and AVFoundation agree each boot... So the change is upstream of both? I'm uncertain where to place blame for this specific issue (UVC device or macOS). Audio on the same physical units is unaffected. The audio uniqueID (AppleUSBAudioEngine:...:<serial>:...) embeds the USB serial and stayed stable through every test. So AVCaptureDevice can provide a stable per-device identifier, just not for UVC video devices. Questions: Is this a bug, or is the documentation overstating the persistence guarantee for USB video devices? What is the supported way to identify a specific physical UVC video device across reboots and port changes? The USB serial number is stable and is what I've fallen back on via IOKit, but there is no documented AVFoundation API to retrieve USB serial number from a UVC video AVCaptureDevice. Related: thread 803759, where the locationID-derived format is described. Script used for all output above (swift ./list-uvc.swift): import AVFoundation import IOKit func usbSerial(forLocation location: UInt32) -> String? { var iterator: io_iterator_t = 0 guard IOServiceGetMatchingServices(kIOMainPortDefault, IOServiceMatching("IOUSBHostDevice"), &iterator) == KERN_SUCCESS else { return nil } defer { IOObjectRelease(iterator) } var result: String? var service = IOIteratorNext(iterator) while service != 0 { var loc: UInt32 = 0 if let ref = IORegistryEntryCreateCFProperty(service, "locationID" as CFString, kCFAllocatorDefault, 0)?.takeRetainedValue(), let num = ref as? NSNumber { loc = num.uint32Value } if loc == location, let ref = IORegistryEntryCreateCFProperty(service, "USB Serial Number" as CFString, kCFAllocatorDefault, 0)?.takeRetainedValue(), let serial = ref as? String { result = serial } IOObjectRelease(service) if result != nil { break } service = IOIteratorNext(iterator) } return result } let session = AVCaptureDevice.DiscoverySession(deviceTypes: [.external], mediaType: .video, position: .unspecified) for device in session.devices { let uid = device.uniqueID let location = UInt32(truncatingIfNeeded: strtoull(uid, nil, 16) >> 32) let serial = usbSerial(forLocation: location) ?? "N/A" print("\(device.localizedName) uid=\(uid) serial=\(serial)") }

Connected my iphone 16 pro to my wireless carplay infotainment system, everything is okay but once a phonecall comes in, the audio just comes from one side of the car (passenger side). I've tried to connect my girlfriend's phone (non-apple) and it sounds fine with phone calls. I've tried resetting the systems on both the car and the phone. Music plays fine. Just the phone call situation is what is bothering at the moment.

I save stills and videos with PHAssetCreationRequest. I do not set originalFilename. Photos saved with addResource(with: .photo, data:) show originalFilename values like IMG_XXXX.HEIC in PHAssetResource. Videos saved with addResource(with: .video, fileURL:) from AVCaptureMovieFileOutput keep the temp file name (a UUID .mov). The docs say that if originalFilename is omitted, Photos infers a name from the file URL when one is provided, otherwise it generates a name. Is there a supported way for a third-party app to get a system IMG_XXXX original filename for a newly saved video? Thank you.

Our macOS app uses MusicKit to search the Apple Music catalog and browse the customer's library. We are not using ApplicationMusicPlayer for playback. The customer's own Music app is the player, and our app is acting as a browser and remote for it. When the customer picks a catalog search result that is not already in their library, we would like to add it to their library, or to a playlist we create and clearly label as belonging to our app, so that it becomes playable from their library. Is using MusicLibrary to add a catalog item to the user's library a supported use of MusicKit in an app that does not itself play the content? Is creating and writing to a clearly labelled playlist of our own preferable to adding to the top-level library, or is either fine? Is there any supported way to hand a catalog item to the Music app for playback without adding it to the library first? We have tried open location with a music.apple.com URL, which opens the item's page but does not begin playback.

We are building a macOS application that we distribute directly from our website, signed with a Developer ID certificate and notarized. It is not on the Mac App Store and we do not plan to put it there. We want to add MusicKit so a customer can browse and play their own Apple Music library inside our app. We have the MusicKit App Service available to enable on an explicit App ID matching the app's bundle identifier, and we understand that MusicKit is not gated by an entitlement and that no private key is needed on Apple platforms. What we cannot find addressed anywhere is the distribution channel itself. Will MusicAuthorization.request and MusicLibraryRequest work in a Developer ID signed and notarized app distributed outside the Mac App Store, or does MusicKit require Mac App Store distribution?

The iOS 27 SDK newly exposed PHLivePhotoRequestOptions.preferHDR. Its documentation states: For best results, only enable this when you intend to display an HDR experience in PHLivePhotoView — for example, when the view’s preferredImageDynamicRange is greater than standard (SDR). PHLivePhotoView has no preferredImageDynamicRange property. How is this API to be used then?

On every iOS 27.0 beta, setExposureModeCustom(duration:iso:completionHandler:) on the front TrueDepth camera (.builtInTrueDepthCamera, position .front) no longer has any observable effect on the video stream. Frame brightness continues to track continuous auto exposure. The same code applies exposure correctly on iOS 26.x and iOS 18.x on the same devices. Reproduced on iPhone 14 Pro Max, iPhone 16, iPhone 16 Pro Max, and iPhone 17 Pro Max running iOS 27.0 betas. Not reproducible on any earlier iOS on the same hardware. Configuration: AVCaptureSession with the TrueDepth device as video input AVCaptureVideoDataOutput (BGRA) plus AVCaptureDepthDataOutput connected Session running, auto exposure settled Repro: Start the session above and wait ~2 s for AE to settle. Apply a custom exposure that should visibly overexpose the image: try device.lockForConfiguration() let format = device.activeFormat device.setExposureModeCustom( duration: CMTime(value: 1, timescale: 15), iso: format.maxISO, // device reports ISO ran completionHandler: nil ) device.unlockForConfiguration() Observe mean luma of delivered frames. Expected: frames become heavily overexposed (max ISO at 1/15 s). Actual: frame brightness is unchanged and keeps adapting with call never happened. No error is thrown, lockForConfiguration succeeds, and isExposureModeSupported(.custom) returns true. The device als custom range (ISO 20...1920, duration up to 1/15 s), so there is no API-visible signal that the command was not applied. [READBACK RESULT: state her device.exposureMode / device.iso / device.exposureDuration reflect the requested values after the call.] Possibly related: on earlier releases the completionHandler f fired on builtInTrueDepthCamera (https://developer.apple.com/forums/thread/770566), while the exposure values themselves were still applied. On i longer applied either. Questions: Is this an intentional change (for example, the system ret while the TrueDepth/depth pipeline is active), or a regression? If intentional, what is the supported way for an app to de refused, and is custom exposure still possible while an AVCaptureDepthDataOutput is connected?

I’m seeing a repeatable first-party cameracaptured crash on an iPhone 14 Pro (iPhone15,2) running iOS 27 beta 5 (24A5424a). The single-camera AVCaptureSession configuration is: Front wide camera 3840×2160 at 30 fps, SDR/420f Two AVCaptureVideoDataOutput connections: Main recording output: 3840×2160 Auxiliary preview output: approximately 2096×1178 Both connections request and activate .standard video stabilization Within roughly two minutes, cameracaptured crashed three times—once during recording and twice during idle preview. The application receives AVErrorMediaServicesWereReset (-11819) after each crash. All three reports have the same faulting queue and underlying stack: com.apple.coremedia.capture.videodata-stabilization.front FigCFDictionaryGetCGRectIfPresent -[BWVISNode _transformRectanglesInMetadata:pts:] -[BWVISNode _stabilizeMetadataForSampleBuffer:] -[BWVISNode _tallyAndEmitSampleBuffer:] VideoStabilizationV2 The first two crashes are: EXC_BAD_ACCESS / EXC_ARM_PAC_FAIL address: 0x00000000dac11a30 termination: PAC_EXCEPTION, code 261 The third reaches the same stabilization stack but terminates with: EXC_BAD_ACCESS / SIGSEGV KERN_INVALID_ADDRESS at 0x30 App-side frame analytics were disabled, system pressure remained nominal, and neither audiomxd nor bluetoothd restarted. The first crash report also shows two front- stabilization worker threads, consistent with the two stabilized video outputs. I have filed Feedback Assistant report FB24553011 with the complete log archive and all three cameracaptured reports. With the iOS 27 public release approaching, waiting for an OS-side fix is not a viable shipping strategy; an app-side workaround is effectively the only option available for our release. Is this a known issue? In particular: Is it safe to leave .standard stabilization on the main recording connection while forcing the auxiliary preview connection to .off? Would disabling/removing the auxiliary AVCaptureVideoDataOutput reliably reduce this to one stabilization pipeline? If a single stabilized front output remains affected, is disabling front-camera stabilization entirely the only supported containment? Is there any public API for disabling the rectangle-metadata processing performed by BWVISNode? The current field workaround is to use the front camera with stabilization Off, or use a rear camera when stabilization is required.

In WWDC20 it was mentioned that missing compileTime/renderTime (or no intermediate image with the dump-intermediates option) can indicate a cached intermediate. I have also seen renderTime=cacheHit on passes that are clearly rendering intermediates, and an actual renderTime is only properly shown on the final pass which always seems to equal the final time render time. In compileTime it says cacheMiss. Which fields should be considered authoritative for tracking intermediate cache hits versus actual rendering? Thanks!

While developing a gallery app, I noticed that the iCloudId can change between devices Phone1 and Phone2, on which iCloud is active. First, I know the assetId is unstable, but the iCloud ID ( How it can be? I thought it was stable and I could use it for sending, for example as a UUID for a items on BE to prevent duplication. Could you please explain to me in which cases the iCloudId can change, and what I can use for stable UUID for my internal item to prevent duplication on the BE side? Additional info: Phone1: - assetId part = B01B27D9-10BE-4C95-BE35-C9A03DBA4006 - iCloudId part = 39E0E3A6-6A37-4E8E-83E9-C1B837E2E973 - iCloudId full = 39E0E3A6-6A37-4E8E-83E9-C1B837E2E973:001:ARUcJ2AQQ/nM6BIRu2dq/NSPi61u Phone2: - assetId part = F51B272C-1BE6-41B3-AB54-39E6BDE1C984 - iCloudId part = F51B272C-1BE6-41B3-AB54-39E6BDE1C984 - iCloudId full = F51B272C-1 BE6-41B3-AB54-39E6BDE1C984:001:ARUcJ2AQQ/mM6BIRu2dq/NSPi61u

Thanks for adding CoreML into the Apple RAW decoder. I'm excited with what it can bring. But I'm having a number of issues with it. My code base is written in Objective-C, and I'm using my custom MTKView. Now when I enabled RAW 9 support, the render is extremely slow (instant vs seconds). The UI would appear to hang with a spinning color wheel. It feels like CoreML processing is being delegated in the rendering thread, which runs on the main queue. How can I improve performance? As someone has reported, there is a black horizontal line in the middle of the image. The image that I was testing came from Fuji X-T5. If I enable EDR (Extended Dynamic Range), RAW 9 stops rendering, and will return ANE error. My app does HDR rendering of RAW files. I cannot get something like Sony A7R IV ARW image to load. Same ANE error. Is there a memory setting I need to tweak? When I render the X-T5 image, the colors appear to be overly saturated, which is different from the result of RAW 8. I cannot speak for the color rendering of other types of RAW files. I was told code base with Catalyst (and perhaps Swift) works without issue, other than being slow (except for large RAW files), but there seems to be an issue with Objective-C?

When building apps, how can I maximize my camera features while using an app to scan and analyze textiles? Is there an integration that has to be inputted that catalogs every fabric type or AI models are able to learn fabric type from every scan? also what is the process/code of including visionOS to scan fabric types to catalog on devices such as smartphones and computers?

Hello, I am developing an iOS app that uses MusicKit and ApplicationMusicPlayer to create automatic transitions between songs from Apple Music. The app already analyzes tracks using BPM, musical key and danceability, orders them for compatible transitions, and uses MusicPlayer.Transition.crossfade for playback. With the public MusicKit APIs, however, I have reached a limitation. ApplicationMusicPlayer manages the playback queue and crossfade internally. I cannot independently control the outgoing and incoming Apple Music tracks as two decks, which would be required for DJ-style transitions (for example, starting the incoming track while independently controlling the outgoing track, choosing precise mix points, and managing the two playback positions during the overlap). I experimented with MusicPlayer.Queue.Entry startTime and endTime, but changing the end point is not equivalent to having independent deck control and can result in the current track ending before the desired transition. I understand that Apple Music content is protected and that direct access to decoded audio samples may intentionally not be available through the public MusicKit APIs. I am not looking to download, extract, record, or export Apple Music audio. My use case is real-time playback only, for authenticated Apple Music subscribers. My questions are: Is there a public API that allows two Apple Music tracks to be independently controlled and mixed in real time? If not, is there a restricted entitlement, API, or developer program available for DJ/mixing applications? If this capability requires a commercial or technical partnership with Apple Music rather than a public API, is there an official channel through which a developer can request or discuss such access? I am aware that some third-party DJ applications provide real-time mixing with Apple Music, so I would like to understand whether there is an officially supported integration path for other developers, rather than trying to work around the limitations of ApplicationMusicPlayer. Thank you.

I have not seen any issues with didActivateAudioSession not getting called by iOS in many many years with many thousands of devices. However with iOS27 beta code I have seen a few times that when making an outgoing call it never gets called. All subsequent outgoing calls fail until I dismiss and relaunch the App.

I’m seeing a device/OS-specific AVFoundation issue on iPhone 14 Pro running iOS 26.6. A secondary AVCaptureVideoDataOutput is used to provide an unstabilized monitoring feed while the main recording connection is stabilized. During continuous zoom changes, frames from the secondary output continue arriving and scene motion remains live, but its visible zoom/crop/FOV intermittently remains unchanged and then catches up. The saved recording remains smooth and reflects the requested zoom correctly. Minimal configuration: Device: iPhone 14 Pro iOS: 26.6 Physical Ultra Wide camera 1920×1080 at 30 fps SDR, 8-bit YUV Main VDO: 420v Main connection stabilization: .cinematicExtendedEnhanced Auxiliary VDO: 420f Auxiliary connection stabilization: explicitly .off automaticallyConfiguresOutputBufferDimensions = false deliversPreviewSizedOutputBuffers = true alwaysDiscardsLateVideoFrames = true Deferred start disabled Both outputs use a serial delegate queue The auxiliary output is displayed directly without image processing. During continuous videoZoomFactor updates: AVCaptureDevice.videoZoomFactor advances correctly. The UI zoom value advances correctly. The main recorded output zooms smoothly. Frames from the auxiliary output continue arriving and scene motion remains live. Only the auxiliary output's visible zoom/crop/FOV intermittently holds at an older value and then catches up. This is not a complete preview-frame stall: camera movement remains visible during the periods when zoom does not visually advance. The problem occurs with any non-Off stabilization tier in the production app because that configuration installs the unstabilized auxiliary output. Stabilization Off removes the auxiliary topology, and zoom then appears smooth on the main preview feed. A standalone capture sample reproduces the problem without the application’s writer or rendering pipeline. Current device matrix: iPhone 14 Pro, iOS 26.6: reproduces. iPhone 13 Pro, iOS 18.6.x, same released application version: does not reproduce. iPhone 17 Pro, iOS 26.6, isolated sample: does not reproduce. iPhone 14 Pro, iOS 27 beta 5: testing in progress — result to be added. The issue was initially reported with HEVC/Apple Log capture, but it remains reproducible after reducing the graph to 1080p30 SDR8. Questions: Is using two video-data-output connections with different stabilization modes—Extreme on the recording output and Off on the monitoring output—a supported configuration? Is delayed propagation of zoom geometry/crop to a secondary video-data output known on iPhone 14 Pro/iOS 26 when another output connection is stabilized? Is there a recommended AVFoundation topology for obtaining a low-latency, unstabilized monitoring feed while separately recording stabilized video? Are there output or connection properties that must be set to make videoZoomFactor geometry changes propagate synchronously to both outputs? I can provide the standalone sample project, screen recordings, connection-mode logs, buffer PTS/arrival cadence, and a sysdiagnose. EDIT: Issue seen on iOS 27 beta 5 devices as well. No such issue is seen in iOS 18 devices.