Explore the integration of media technologies within your app. Discuss working with audio, video, camera, and other media functionalities.

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Is AVPlayerViewController not supported on macCatalyst?
When building an application that can be built on iOS using macCatalyst, a link error like the one below will occur. Undefined symbol: OBJC_CLASS$_AVPlayerViewController The AVPlayerViewController documentation seems to support macCatalyst, but what is the reality? [AVPlayerViewController](https://developer.apple.com/documentation/avkit/avplayerviewcontroller? language=objc) Each version of the environment is as follows. Xcode 16.2 macOS deployment target: macOS 10.15 iOS deployment target: iOS 13.0 Thank you for your support.
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AVContentKeySession reuse
Context We develop an iOS/Apple TV app that allows to play HLS+FP Live streams (custom playback UI), some of which use the same FairPlay content key id. All FairPlay content keys are requested to the same content key server. Implementation Despite Apple documentation warning to not reuse AVContentKeySessions, we use only one AVContentKeySession for all channels which allows the system to reuse the content key when a content key id is met again. As seen in another thread, people seems to think this is OK. Issue When reusing the AVContentKeySession and the user quickly tunes channels multiple times (up to 2 or 3 times per second using gestures), an inconsistency may occur where the content key request for a previous streams is asked to the delegate after a new stream is already being prepared and its AVURLAsset already assigned as the content key session AVContentKeyRecipient. Note that the previous content key recipient is removed before the new one is added. We also have been reported for crashes (though I haven't experienced it myself) when performing multiple channels tunings which makes us think that the AVContentKeySession should definitely not been reused. Note: On the other hand if a new AVContentKeySession is used for each stream, the system systematically requests a content key even if previous streams have used the same content key id. In this case, neither the crash nor the inconsistency issue are observed but it dramatically increases the number of calls to the content key server. Questions Should AVContentKeySessions definitely not be reused? Otherwise, how to handle the inconsistency issue described above?
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HDR video metadata
On an iOS 18 phone, I use AVCaptureSession to capture HDR with x420 format. The output CMSampleBuffer is HLG colorspace, the propagated attachments contain kCVImageBufferAmbientViewingEnvironmentKey and kCVImageBufferSceneIlluminationKey. Now I use CAMetalLayer to render the CVPixelBuffer to the screen, but the brightness is brighter than AVSampleBufferDisplayLayer. Here is my code. - (void)_updateColorSpaceIfNeed:(CVPixelBufferRef)pixelBuffer { CAMetalLayer *layer = (CAMetalLayer *)_mtkView.layer; if (![layer isKindOfClass:CAMetalLayer.class]) return; layer.wantsExtendedDynamicRangeContent = YES; CFDataRef ambientViewingEnvironment = (CFDataRef)CVBufferCopyAttachment(pixelBuffer, kCVImageBufferAmbientViewingEnvironmentKey, NULL); NSData *data = (__bridge NSData *)ambientViewingEnvironment; if (ambientViewingEnvironment) CFRelease(ambientViewingEnvironment); CAEDRMetadata *metadata = [CAEDRMetadata HLGMetadataWithAmbientViewingEnvironment:data]; // CAEDRMetadata *metadata = [CAEDRMetadata HLGMetadata]; layer.EDRMetadata = metadata; layer.pixelFormat = MTLPixelFormatRGBA16Float; CGColorSpaceRef colorspace = CGColorSpaceCreateWithName(kCGColorSpaceITUR_2100_HLG); layer.colorspace = colorspace; if (colorspace) CGColorSpaceRelease(colorspace); } Why does the CAEDRMetadata class have "HLGMetadataWithAmbientViewingEnvironment:" and "HLGMetadata" methods, but does not provide the "HLGMetadataWithAmbientViewingEnvironment:sceneIllumination" method? I want to know how kCVImageBufferAmbientViewingEnvironmentKey and kCVImageBufferSceneIlluminationKey affect tone mapping. Is there any documentation I can refer to?
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Regarding FPS SDK Upgrade
Hi Apple Team, We have integrated FairPlay Streaming Server SDK v3 into our MDRM platform since 2017, the system works stable and stayed untouched. As you know, both Widevine and Playready have requirements to upgrade the Server SDK regularly. We want to know if Apple imposes similar requirements for upgrading the FPS SDK, or if we may continue using the old one without any updates. Thanks for your support!
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Distortion corrected images
Hi, Currently I am developing a 3D reconstruction project. Which requires images to be distortion-free (rectilinear) and with known intrinsics. The session I am developing on is a builtInDualWideCamera, with isGeometricDistortionCorrectionEnabled set to false to be able to get the intrinsic matrix of the images, isVirtualDeviceConstituentPhotoDeliveryEnabled set to true and isAutoVirtualDeviceFusionEnabled set to false to get both images and isCameraCalibrationDataDeliveryEnabled set to true to actually get the calibration data. The distortion correction parameters such as lensDistortionLookupTable are used. The 42 coefficients mapping array is used as described in the AVCameraCalibrationData header file. A simple piecewise linear interpolation. There are two questions I would like to get support on: A way to set the calibration parameters in each image. I have an approach that sets the parameters in the kCGImagePropertyExifDictionary -> "UserComment". Is there a better approach to write calibration parameter data into the images? I feel like this is a bit dirty and there might be a better and neat approach. For the ultra-wide angle camera's images, the lensDistortionLookupTable contains several zeros at the end of the array. For example (last 10 elements are zero): "LensDistortionLookupTable":"0.000000000000000,0.000349554029526,0.001385628827848,0.003071037586778,... ,0.000000000000000,0.000000000000000,0.000000000000000,0.000000000000000,0.000000000000000,0.000000000000000,0.000000000000000,0.000000000000000,0.000000000000000,0.000000000000000" The problem comes when the complete array is used to correct the image (including zeros), the end result is a wrapped-like-circle image close to the edges of it which is completely wrong. In contrast, if the LensDistortionLookupTable is used without the last zeros and the new size accommodated the image looks better (although not as rectilinear as if you take the image from the iPhone's camera app), but definitely less distorted. Including zeros (full array): Excluding zeros (array size changed): Am I missing an important point in the usage of the lensDistortionLookupTable where this case is addressed (zeros at the end)? What is the criteria to shrink/exclude elements of the array? Any advice is very much welcome.
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MusicKit Web Playback States
In MusicKit Web the playback states are provided as numbers. For example the playbackStateDidChange event listener will return: {oldState: 2, state: 3, item:...} When the state changes from playing (2) to paused (3). Those are pretty easy to guess, but I'm having a hard time with some of the others: completed, ended, loading, none, paused, playing, seeking, stalled, stopped, waiting. I cannot find a mapping of states to numbers documented anywhere. I got the above states from an enum in a d.ts file that is often incorrect/incomplete. Can someone help out pointing to the docs or provide a mapping? Thanks.
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How to reduce CMSampleBuffer volume
Hello, Basically, I am reading and writing an asset. To simplify, I am just reading the asset and rewriting it into an output video without any modifications. However, I want to add a fade-out effect to the last three seconds of the output video. I don’t know how to do this. So far, before adding the CMSampleBuffer to the output video, I tried reducing its volume using an extension on CMSampleBuffer. In the extension, I passed 0.4 for testing, aiming to reduce the video's overall volume by 60%. My question is: How can I directly adjust the volume of a CMSampleBuffer? Here is the extension: extension CMSampleBuffer { func adjustVolume(by factor: Float) -> CMSampleBuffer? { guard let blockBuffer = CMSampleBufferGetDataBuffer(self) else { return nil } var length = 0 var dataPointer: UnsafeMutablePointer<Int8>? guard CMBlockBufferGetDataPointer(blockBuffer, atOffset: 0, lengthAtOffsetOut: nil, totalLengthOut: &length, dataPointerOut: &dataPointer) == kCMBlockBufferNoErr else { return nil } guard let dataPointer = dataPointer else { return nil } let sampleCount = length / MemoryLayout<Int16>.size dataPointer.withMemoryRebound(to: Int16.self, capacity: sampleCount) { pointer in for i in 0..<sampleCount { let sample = Float(pointer[i]) pointer[i] = Int16(sample * factor) } } return self } }
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CoreMediaErrorDomain error -12927 with HEVC and DRM
I can't play video content with HEVC and DRM. Tested HEVC only: OK. Tested DRM+AVC: Ok. Tested 2 players (Clappr/Stevie and BitMovin) Master, variants and EXT-X-MAPs are downloaded Ok, DRM keys Ok and then, for instance with BitMovin Player: [BMP] [Player] [Error] Event: SourceError, Data: {"code":2001,"data":{"message":"The operation couldn’t be completed. (CoreMediaErrorDomain error -12927.)","code":-12927},"message":"Source Error. The operation couldn’t be completed. (CoreMediaErrorDomain error -12927.)","timestamp":1740320663.4505711,"type":"onSourceError"} code: 2001 [Data code: -12927, message: The operation couldn’t be completed. (CoreMediaErrorDomain error -12927.), underlying error: Error Domain=CoreMediaErrorDomain Code=-12927 "(null)"] 4k-master.m3u8.txt 4k.m3u8.txt 4k-audio.m3u8.txt
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Finding which effect has been selected for a Live Photo
I am writing an iOS app to present a slide show of assets in a Photo album, in a random order, including videos and live photos. I have got it all working quite nicely but for a Live Photo, I need to know what effect is selected (Live, Loop, Bounce, Long Exposure, Live Off) to display the image correctly. I can't find any mention of getting this information in the documentation. Anyone know how to do this? Thanks in advance. Adrian. (Xcode 16.1 iOS 18.0)
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AVAudioEngine. Select input device on macOS
Hello! I'm use AVFoundation for preview video and audio from selected device, and I try use AVAudioEngine for preview audio in real-time, but I can't or I don't understand how select input device? I can hear only my microphone in real-time So far, I'm using AVCaptureAudioPreviewOutput for in real-time hear audio, but I think has delay. On iOS works easy with AVAudioEngine, but on macOS bruh...
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kCGImageSourceDecodeToHDR and CGImageSourceCopyPropertiesAtIndex
Hi, I'm using Core Graphics to load a .DNG photo shot by a Leica Q3 camera. The photo is shot in portrait, however the embedded preview is rotated 90 degrees to landscape. I load the photo like this: let options = [kCGImageSourceDecodeRequest: kCGImageSourceDecodeToHDR] as CFDictionary let source = CGImageSourceCreateWithData(data as CFData, nil) let cgimage = CGImageSourceCreateImageAtIndex(source, 0, options) let properties = CGImageSourceCopyPropertiesAtIndex(source, 0, nil) as? [CFString : Any] When doing this I can see that the orientation property is 1 indicating that the orientation is 'Up', which it isn't. If I don't specify the kCGImageSourceDecodeToHDR option (eseentially setting options to nil) - the orientation property is 8 (rotated 90 degrees). What puzzles me is that a chang to the CGImageSourceCreateImageAtIndex call can have an influence on that latter call to CGImageSourceCopyPropertiesAtIndex ? I would expect these to work independently? Cheers Thomas
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Set the capture device color space to apple log not works.
I set the device format and colorspace to Apple Log and turn off the HDR, why the movie output is still in HDR format rather than ProRes Log? Full runnable demo here: https://github.com/SpaceGrey/ColorSpaceDemo session.sessionPreset = .inputPriority // get the back camera let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInWideAngleCamera], mediaType: .video, position: .back) backCamera = deviceDiscoverySession.devices.first! try! backCamera.lockForConfiguration() backCamera.automaticallyAdjustsVideoHDREnabled = false backCamera.isVideoHDREnabled = false let formats = backCamera.formats let appleLogFormat = formats.first { format in format.supportedColorSpaces.contains(.appleLog) } print(appleLogFormat!.supportedColorSpaces.contains(.appleLog)) backCamera.activeFormat = appleLogFormat! backCamera.activeColorSpace = .appleLog print("colorspace is Apple Log \(backCamera.activeColorSpace == .appleLog)") backCamera.unlockForConfiguration() do { let input = try AVCaptureDeviceInput(device: backCamera) session.addInput(input) } catch { print(error.localizedDescription) } // add output output = AVCaptureMovieFileOutput() session.addOutput(output) let connection = output.connection(with: .video)! print( output.outputSettings(for: connection) ) /* ["AVVideoWidthKey": 1920, "AVVideoHeightKey": 1080, "AVVideoCodecKey": apch,<----- prores has enabled. "AVVideoCompressionPropertiesKey": { AverageBitRate = 220029696; ExpectedFrameRate = 30; PrepareEncodedSampleBuffersForPaddedWrites = 1; PrioritizeEncodingSpeedOverQuality = 0; RealTime = 1; }] */ previewSource = DefaultPreviewSource(session: session) queue.async { self.session.startRunning() } }
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New playback error on iOS/tvOS 18.x "CoreMediaErrorDomain Code=-15486"
Hello, Our users have started to see a new fatal AVPlayer error during playback starting with iOS/tvOS 18.0. The error is defined as "CoreMediaErrorDomain Code=-15486". We have not been able to reproduce this issue locally within our development team. Is there any documentation on the cause of this error or steps to recover from this error? Thank you, Howard
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Best Approach for Reliable Background Audio Playback with Audio Ducking on Command from Server
I am developing an iOS app that needs to play spoken audio on demand from a server, while ducking the audio of background music from another app (e.g., SoundtrackYourBrand or Apple Music). This must work even when the app is in the background, and the server dictates when and what audio is played. Ideally, the message should be played within a minute of the server requesting it. Current Attempt & Observations I initially tried using Firebase Cloud Messaging (FCM) silent notifications to send a URL to an audio file, which the app would then play using AVPlayer. This works consistently when the app is active, but in the background, it only works about 60% of the time. In cases where it fails, iOS ducks the background music (e.g., from SoundtrackYourBrand) but never plays the spoken audio. Interestingly, when I play the audio without enabling audio ducking, it seems to work 100% of the time from my limited testing, even in the background. The app has background modes enabled for Audio, Background Fetch, and Remote Notifications. Best Approach to Achieve This? I’d like guidance on the best Apple-compliant approach to reliably play audio on command from the server, even when the app is in the background. Some possible paths: Ensuring the app remains active in the background – Are there recommended ways to prevent the app from getting suspended, such as background tasks, a special background mode, or a persistent connection to the server? Alternative triggering mechanisms – Would something like VoIP, Push-to-Talk, or another background service be better suited for this use case? Built-in iOS speech synthesis (AVSpeechSynthesizer) – If playing external audio is unreliable, would generating speech dynamically from text be a more robust approach? Streaming audio instead of sending a URL – Could continuous streaming from the server keep the app active and allow playback at the right moment? I want to ensure the solution is reliable and works 100% of the time when needed. Any recommendations on the best approach for this would be greatly appreciated. Thank you for your time and guidance.
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Call Limit of the Apple Music API
We are planning to develop an application using the Apple Music API. We would like to design our system based on the details of the rate limits mentioned below and have a few questions: https://developer.apple.com/documentation/applemusicapi/generating-developer-tokens#Request-Rate-Limiting Regarding the Catalog API (/v1/catalog/*), we understand that server-side caching is enabled, making it less likely to reach the rate limit. Is this understanding correct? (Excluding the search API) For APIs like the Library API (/v1/me/library/*), where responses vary by user, we assume they are more likely to reach the rate limit. Is this correct? We plan to implement optimizations to minimize unnecessary API calls. Given this, would the current Music API be able to handle a significant increase in users? (Assuming a DAU of around 100,000 to 1,000,000) If the API cannot support this scale, would it be allowed under Apple’s policy to cache responses from the Catalog API (/v1/catalog/*) via our proxy server to avoid hitting the rate limit? The third question is the one we most want to confirm.
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H.265 Decoding with VideoToolBox
I am creating an app that decodes H.265 elementary streams on iOS. I use VideoToolBox to decode from H.265 to NV12. The decoded data is enqueued in the CMSampleBufferDisplayLayer as a CMSampleBuffer. However, nothing is displayed in the VideoPlayerView. It remains black. The decoding in VideoToolBox is successful. I confirmed this by saving the NV12 data in the CMSampleBuffer to a file and displaying it using a tool. Why is nothing displayed in the VideoPlayerView? I can provide other source code as well. // // ContentView.swift // H265Decoder // // Created by Kohshin Tokunaga on 2025/02/15. // import SwiftUI struct ContentView: View { var body: some View { VStack { Text("H.265 Player (temp.h265)") .font(.headline) VideoPlayerView() .frame(width: 360, height: 640) // Adjust or make it responsive for iOS } .padding() } } #Preview { ContentView() } // // VideoPlayerView.swift // H265Decoder // // Created by Kohshin Tokunaga on 2025/02/15. // import SwiftUI import AVFoundation struct VideoPlayerView: UIViewRepresentable { // Return an H265Player as the coordinator, and start playback there. func makeCoordinator() -> H265Player { H265Player() } func makeUIView(context: Context) -> UIView { let uiView = UIView(frame: .zero) // Base layer for attaching sublayers uiView.backgroundColor = .black // Screen background color (for iOS) // Create the display layer and add it to uiView.layer let displayLayer = context.coordinator.displayLayer displayLayer.frame = uiView.bounds displayLayer.backgroundColor = UIColor.clear.cgColor uiView.layer.addSublayer(displayLayer) // Start playback context.coordinator.startPlayback() return uiView } func updateUIView(_ uiView: UIView, context: Context) { // Reset the frame of the AVSampleBufferDisplayLayer when the view's size changes. let displayLayer = context.coordinator.displayLayer displayLayer.frame = uiView.layer.bounds // Optionally update the layer's background color, etc. uiView.backgroundColor = .black displayLayer.backgroundColor = UIColor.clear.cgColor // Flush transactions if necessary CATransaction.flush() } } // // H265Player.swift // H265Decoder // // Created by Kohshin Tokunaga on 2025/02/15. // import Foundation import AVFoundation import CoreMedia class H265Player: NSObject, VideoDecoderDelegate { let displayLayer = AVSampleBufferDisplayLayer() private var decoder: H265Decoder? override init() { super.init() // Initial configuration for the display layer displayLayer.videoGravity = .resizeAspect // Initialize the decoder (delegate = self) decoder = H265Decoder(delegate: self) // For simple playback, set isBaseline to true decoder?.isBaseline = true } func startPlayback() { // Load the file "cars_320x240.h265" guard let url = Bundle.main.url(forResource: "temp2", withExtension: "h265") else { print("File not found") return } do { let data = try Data(contentsOf: url) // Set FPS and video size as needed let packet = VideoPacket(data: data, type: .h265, fps: 30, videoSize: CGSize(width: 1080, height: 1920)) // Decode as a single packet decoder?.decodeOnePacket(packet) } catch { print("Failed to load file: \(error)") } } // MARK: - VideoDecoderDelegate func decodeOutput(video: CMSampleBuffer) { // When decoding is complete, send the output to AVSampleBufferDisplayLayer displayLayer.enqueue(video) } func decodeOutput(error: DecodeError) { print("Decoding error: \(error)") } }
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H.265 Decoding with VideoToolBox
I am creating an app that decodes H.265 elementary streams on iOS. I use VideoToolBox to decode from H.265 to NV12. The decoded data is enqueued in the CMSampleBufferDisplayLayer as a CMSampleBuffer. However, nothing is displayed in the VideoPlayerView. It remains black. The decoding in VideoToolBox is successful. I confirmed this by saving the NV12 data in the CMSampleBuffer to a file and displaying it using a tool. Why is nothing displayed in the VideoPlayerView? I can provide other source code as well. // // VideoPlayerView.swift // H265Decoder // // Created by Kohshin Tokunaga on 2025/02/15. // import SwiftUI import AVFoundation struct VideoPlayerView: UIViewRepresentable { // Return an H265Player as the coordinator, and start playback there. func makeCoordinator() -> H265Player { H265Player() } func makeUIView(context: Context) -> UIView { let uiView = UIView(frame: .zero) // Base layer for attaching sublayers uiView.backgroundColor = .black // Screen background color (for iOS) // Create the display layer and add it to uiView.layer let displayLayer = context.coordinator.displayLayer displayLayer.frame = uiView.bounds displayLayer.backgroundColor = UIColor.clear.cgColor uiView.layer.addSublayer(displayLayer) // Start playback context.coordinator.startPlayback() return uiView } func updateUIView(_ uiView: UIView, context: Context) { // Reset the frame of the AVSampleBufferDisplayLayer when the view's size changes. let displayLayer = context.coordinator.displayLayer displayLayer.frame = uiView.layer.bounds // Optionally update the layer's background color, etc. uiView.backgroundColor = .black displayLayer.backgroundColor = UIColor.clear.cgColor // Flush transactions if necessary CATransaction.flush() } } // // H265Player.swift // H265Decoder // // Created by Kohshin Tokunaga on 2025/02/15. // import Foundation import AVFoundation import CoreMedia class H265Player: NSObject, VideoDecoderDelegate { let displayLayer = AVSampleBufferDisplayLayer() private var decoder: H265Decoder? override init() { super.init() // Initial configuration for the display layer displayLayer.videoGravity = .resizeAspect // Initialize the decoder (delegate = self) decoder = H265Decoder(delegate: self) // For simple playback, set isBaseline to true decoder?.isBaseline = true } func startPlayback() { // Load the file "cars_320x240.h265" guard let url = Bundle.main.url(forResource: "temp2", withExtension: "h265") else { print("File not found") return } do { let data = try Data(contentsOf: url) // Set FPS and video size as needed let packet = VideoPacket(data: data, type: .h265, fps: 30, videoSize: CGSize(width: 1080, height: 1920)) // Decode as a single packet decoder?.decodeOnePacket(packet) } catch { print("Failed to load file: \(error)") } } // MARK: - VideoDecoderDelegate func decodeOutput(video: CMSampleBuffer) { // When decoding is complete, send the output to AVSampleBufferDisplayLayer displayLayer.enqueue(video) } func decodeOutput(error: DecodeError) { print("Decoding error: \(error)") } }
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PHPhotoLibrary.shared().performChanges raised error 3303
I want to modify the photo's exif information, which means putting the original image in through CGImageDestinationAddImageFromSource, and then adding the modified exif information to a place called properties. Here is the complete process: static func setImageMetadata(asset: PHAsset, exif: [String: Any]) { let options = PHContentEditingInputRequestOptions() options.canHandleAdjustmentData = { (adjustmentData) -> Bool in return true } asset.requestContentEditingInput(with: options, completionHandler: { input, map in guard let inputNN = input else { return } guard let url = inputNN.fullSizeImageURL else { return } let output = PHContentEditingOutput(contentEditingInput: inputNN) let adjustmentData = PHAdjustmentData(formatIdentifier: AppInfo.appBundleId(), formatVersion: AppInfo.appVersion(), data: Data()) output.adjustmentData = adjustmentData let outputURL = output.renderedContentURL guard let source = CGImageSourceCreateWithURL(url as CFURL, nil) else { return } guard let dest = CGImageDestinationCreateWithURL(outputURL as CFURL, UTType.jpeg.identifier as CFString, 1, nil) else { return } CGImageDestinationAddImageFromSource(dest, source, 0, exif as CFDictionary) let d = CGImageDestinationFinalize(dest) // d is true, and I checked the content of outputURL, image has been write correctly, it could be convert to UIImage and image is ok. PHPhotoLibrary.shared().performChanges { let changeReq = PHAssetChangeRequest(for: asset) changeReq.contentEditingOutput = output } completionHandler: { succ, err in if !succ { print(err) // 3303 here, always! } } }) }
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Do we need an MFi authentication chip to send video/commands to iPhone?
Hello, my company is developing a product that will send data to/from the phone over cable and Wi-Fi. I have three questions: Do we need an MFi authentication chip in our product if we plan to send video and commands to the iPhone/iPad over USB or Lightning cable? Likewise, do we need an MFI authentication chip for communication over Wi-Fi? (Informal research suggests that the answer is no to this one.) And, do we even still need MFI certification at all for Wi-Fi comms? (We are not using HomeKit.) Thank you!
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SFSpeechRecognizer throws User denied access to speech recognition
I have created an app where you can speak using SFSpeechRecognizer and it will recognize you speech into text, translate it and then return it back using speech synthesis. All locales for SFSpeechRecognizer and switching between them work fine when the app is in the foreground but after I turn off my screen(the app is still running I just turned off the screen) and try to create new recognitionTask it it receives this error inside the recognition task: User denied access to speech recognition. The weird thing about this is it only happens with some languages. The error happens with Croatian or Hungarian locale for speech recognition but doesn't with English or Spanish locale.
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