Our streaming app uses FairPlay-protected video streams, which previously worked fine when using AVAssetResourceLoaderDelegate to provide CKCs.
Recently, we migrated to AVContentKeySession, and while everything works as expected during regular playback, we encountered an issue with AirPlay.
Our CKC has a 120-second expiry, so we renew it by calling renewExpiringResponseData..
This trigger the didProvideRenewingContentKeyRequest delegate and we respond with updated CKC.
However, when streaming via AirPlay, both video and audio freeze exactly after 120 seconds.
To validate the issue, I tested with AVAssetResourceLoaderDelegate and found that I can reproduce the same freeze if I do not renew the key. This suggests that AirPlay is not accepting the renewed CKC when using AVContentKeySession.
Additional Details:
This issue occurs across different iOS versions and various AirPlay devices.
The same content plays without issues when played directly on the device.
The renewal process is successful, and segments continue to load, but playback remains frozen.
Tried renewing the CKC bit early (100s).
I also tried setting player.usesExternalPlaybackWhileExternalScreenIsActive = true, but the issue persists.
We don't use persistentKey.
Is there anything else that needs to be considered for proper key renewal when AirPlaying?
Any help on how to fix this or confirmation if this is a known issue would be greatly appreciated.
Explore the integration of media technologies within your app. Discuss working with audio, video, camera, and other media functionalities.
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Hi,
I have been working on a project that enables users to listen to their favorite music using a streaming service, which so far was Spotify. The app had a programmable 3D/2D interface with the ability to connect to devices in your home and have them react to music. As of September 2024, Spotify decomissioned their Audio Analysis API. I have seen other posts mention playing Apple Music through AVFoundation, which would break DRM and so it’s not supported. However, the Spotify Audio Analysis API does not allow for a full frequency reconstruction. It is entirely temporal data on beats, kicks, loudness, and timbre changes, which themselves are operators on the spectral data from the FFT. It would be very useful for the developer community if we get the ability to do this and it will probably Apple Music among developers and those who use their apps a lot more.
Would love to hear your thoughts about this and Happy New Year!
We move to another streaming service and need to deliver a ASK, .PEM &key, and CRT to enable DRM. Now the issue is that we don't have that information anymore.
Most logical would be to revoke the current certificate and create a new one. Unfortunately for Fairplay Streaming Certificates there is no revoke button.
We asked developer support who isn't able to help. We then did a request to revoke as described in article 2.7 of the Apple Developer Program License Agreement. They can only do this when the certificate is compromised.
So now we are stuck. Anyone out there who had the same issue and found a solution?
Your help is much appreciated.
Hi everyone,
I’m working on an iOS MusicKit app that overlays a metronome on top of Apple Music playback. To line the clicks up perfectly I’d like access to low-level audio analysis data—ideally a waveform / spectrogram or beat grid—while the track is playing.
I’ve noticed that several approved DJ apps (e.g. djay, Serato, rekordbox) can already: • Display detailed scrolling waveforms of Apple Music songs • Scratch, loop or time-stretch those tracks in real time
That implies they receive decoded PCM frames or at least high-resolution analysis data from Apple Music under a special entitlement.
My questions: 1. Does MusicKit (or any public framework) expose real-time audio buffers, FFT bins, or beat markers for streaming Apple Music content? 2. If not, is there an Apple program or entitlement that developers can apply for—similar to the “DJ with Apple Music” initiative—to gain that deeper access? 3. Where can I find official documentation or a point of contact for this kind of request?
I’ve searched the docs and forums but only see standard MusicKit playback APIs, which don’t appear to expose raw audio for DRM-protected songs. Any guidance, links or insider tips on the proper application process would be hugely appreciated!
Thanks in advance.
Hi all,
we are in the business of scanning documents and barcodes with the camera system of mobile devices. Since there is a wide variety of use cases, from scanning tiniest barcodes and small business cards to scanning barcodes or large documents from far distances we preferably rely on the triple camera devices, if available, with automatic constituent device switching.
This approach used to be working perfectly fine. Depending on the zoom level (we prefer to use an initial zoom value of 2.0) and the focusing distance the iPhone Pro models switched through the different camera systems at light speed: from ultra-wide to wide, tele and back. No issues at all.
Unfortunately the new iPhone 16 Pro models behave very different when it comes to constituent device switching based on focus distance. The switching is slow and sometimes it does not happen at all when the focusing distance changes. Especially when aiming for a at a distant object for a longer time and then aiming at a very close object that is maybe 2" away. The iPhone 15 Pro here always switches immediately to the ultra-wide camera, while the iPhone 16 Pro takes at least 2-3 seconds, in rare cases up to 10 seconds and sometimes forever to switch to the ultra-wide camera.
Of course we assumed that our code is responsible for these issues. So we experimented with restricting the devices and so on. Then we stripped more and more configuration code but nothing we tried improved the situation.
So we ended up writing a minimal example app that demonstrates the problem. You can find the code below. Execute it on various iPhones and aim at far distance (> 10 feet) and then quickly to very close distance (<5 inches).
Here is a list of devices and our test results:
iPhone 15 Pro, iOS 17.6: very fast and reliable switching
iPhone 15 Pro, iOS 18.1: very fast and reliable switching
iPhone 13 Pro Max, iOS 15.3: very fast and reliable switching
iPhone 16 (dual-wide camera), iOS 18.1: very fast and reliable switching
iPhone 16 Pro, iOS 18.1: slow switching, unreliable
iPhone 16 Pro Max, iOS 18.1: slow switching, unreliable
Questions:
Does anyone else have seen this issue? And possibly found a workaround?
Is this behaviour intended on iPhone 16 Pro models? Can we somehow improve the switching speed?
Further the iPhone 16 Pro models also show a jumping preview in the preview layer when they switch the constituent active device. Not dramatic, but compared to the other phones it looks like a glitch.
Thank you very much!
Kind regards,
Sebastian
import UIKit
import AVFoundation
class ViewController: UIViewController {
var captureSession : AVCaptureSession!
var captureDevice : AVCaptureDevice!
var captureInput : AVCaptureInput!
var previewLayer : AVCaptureVideoPreviewLayer!
var activePrimaryConstituentToken: NSKeyValueObservation?
var zoomToken: NSKeyValueObservation?
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
checkPermissions()
setupAndStartCaptureSession()
}
func checkPermissions() {
let cameraAuthStatus = AVCaptureDevice.authorizationStatus(for: AVMediaType.video)
switch cameraAuthStatus {
case .authorized:
return
case .denied:
abort()
case .notDetermined:
AVCaptureDevice.requestAccess(for: AVMediaType.video, completionHandler:
{ (authorized) in
if(!authorized){
abort()
}
})
case .restricted:
abort()
@unknown default:
fatalError()
}
}
func setupAndStartCaptureSession() {
DispatchQueue.global(qos: .userInitiated).async{
self.captureSession = AVCaptureSession()
self.captureSession.beginConfiguration()
if self.captureSession.canSetSessionPreset(.photo) {
self.captureSession.sessionPreset = .photo
}
self.captureSession.automaticallyConfiguresCaptureDeviceForWideColor = true
self.setupInputs()
DispatchQueue.main.async {
self.setupPreviewLayer()
}
self.captureSession.commitConfiguration()
self.captureSession.startRunning()
self.activePrimaryConstituentToken = self.captureDevice.observe(\.activePrimaryConstituent, options: [.new], changeHandler: { (device, change) in
let type = device.activePrimaryConstituent!.deviceType.rawValue
print("Device type: \(type)")
})
self.zoomToken = self.captureDevice.observe(\.videoZoomFactor, options: [.new], changeHandler: { (device, change) in
let zoom = device.videoZoomFactor
print("Zoom: \(zoom)")
})
let switchZoomFactor = 2.0
DispatchQueue.main.async {
self.setZoom(CGFloat(switchZoomFactor), animated: false)
}
}
}
func setupInputs() {
if let device = AVCaptureDevice.default(.builtInTripleCamera, for: .video, position: .back) {
captureDevice = device
} else {
fatalError("no back camera")
}
guard let input = try? AVCaptureDeviceInput(device: captureDevice) else {
fatalError("could not create input device from back camera")
}
if !captureSession.canAddInput(input) {
fatalError("could not add back camera input to capture session")
}
captureInput = input
captureSession.addInput(input)
}
func setupPreviewLayer() {
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
view.layer.addSublayer(previewLayer)
previewLayer.frame = self.view.layer.frame
}
func setZoom(_ value: CGFloat, animated: Bool) {
guard let device = captureDevice else { return }
let maxZoom: CGFloat = captureDevice.maxAvailableVideoZoomFactor
let minZoom: CGFloat = captureDevice.minAvailableVideoZoomFactor
let zoomValue = max(min(value, maxZoom), minZoom)
let deltaZoom = Float(abs(zoomValue - device.videoZoomFactor))
do {
try device.lockForConfiguration()
if animated {
device.ramp(toVideoZoomFactor: zoomValue, withRate: max(deltaZoom * 50.0, 50.0))
} else {
device.videoZoomFactor = zoomValue
}
device.unlockForConfiguration()
} catch {
return
}
}
}
I'm encountering errors while using AVAudioEngine with voice processing enabled (setVoiceProcessingEnabled(true)) in scenarios where the input and output audio devices are not the same. This issue arises specifically with mismatched devices, preventing the application from functioning as expected.
Works: Paired devices (e.g., MacBook Pro mic → MacBook Pro speakers)
Fails: Mismatched devices (e.g., AirPods mic → MacBook Pro speakers)
When using paired input and output devices:
The setup works as expected.
Example: MacBook Pro microphone → MacBook Pro speakers.
When using mismatched devices:
AVAudioEngine setup fails during aggregate device construction.
Example: AirPods microphone → MacBook Pro speakers.
Error logs indicate a channel count mismatch.
Here are the partial logs. Due to the content limit, I cannot post the entire logs.
AUVPAggregate.cpp:1000 client-side input and output formats do not match (err=-10875)
AUVPAggregate.cpp:1036 err=-10875
AVAEInternal.h:109 [AVAudioEngineGraph.mm:1344:Initialize: (err = PerformCommand(*outputNode, kAUInitialize, NULL, 0)): error -10875
AggregateDevice.mm:329 Failed expectation of constructed aggregate (312): mInput.streamChannelCounts == inputStreamChannelCounts
AggregateDevice.mm:331 Failed expectation of constructed aggregate (312): mInput.totalChannelCount == std::accumulate(inputStreamChannelCounts.begin(), inputStreamChannelCounts.end(), 0U)
AggregateDevice.mm:182 error fetching default pair
AggregateDevice.mm:329 Failed expectation of constructed aggregate (336): mInput.streamChannelCounts == inputStreamChannelCounts
AggregateDevice.mm:331 Failed expectation of constructed aggregate (336): mInput.totalChannelCount == std::accumulate(inputStreamChannelCounts.begin(), inputStreamChannelCounts.end(), 0U)
AUHAL.cpp:1782 ca_verify_noerr: [AudioDeviceSetProperty(mDeviceID, NULL, 0, isInput, kAudioDevicePropertyIOProcStreamUsage, theSize, theStreamUsage), 560227702]
AudioHardware-mac-imp.cpp:3484 AudioDeviceSetProperty: no device with given ID
AUHAL.cpp:1782 ca_verify_noerr: [AudioDeviceSetProperty(mDeviceID, NULL, 0, isInput, kAudioDevicePropertyIOProcStreamUsage, theSize, theStreamUsage), 560227702]
AggregateDevice.mm:182 error fetching default pair
AggregateDevice.mm:329 Failed expectation of constructed aggregate (348): mInput.streamChannelCounts == inputStreamChannelCounts
AggregateDevice.mm:331 Failed expectation of constructed aggregate (348): mInput.totalChannelCount == std::accumulate(inputStreamChannelCounts.begin(), inputStreamChannelCounts.end(), 0U)
Is it possible to use voice processing with different input/output devices?
If yes, are there any specific configurations required to handle mismatched devices?
How can we resolve channel count mismatch errors during aggregate device construction?
Are there settings or API adjustments to enforce compatibility between input/output devices?
Are there any workarounds or alternative approaches to achieve voice processing functionality with mismatched devices?
For instance, can we force an intermediate channel configuration or downmix input/output formats?
I'm getting this error when I launch my application on the iPhone 14 Pro via Xcode. Everything builds OK. I"m using the audio kit plugin and Sound Pipe Audiokit.
The error starts as soon as I start the app and will carry on repeatedly.
I have background processing turned on as I'd like the sounds to play when the phone is locked via the headphones.
I can't find anything online about this error. None of my catches are printing anything in the logs either. So I don't know if this is just something that pops up repeatedly or whether there is something fundamentally wrong.
private func setupAudioSession() {
do {
let session = AVAudioSession.sharedInstance()
try session.setCategory(.playback, mode: .default, options: [.mixWithOthers])
try session.setActive(true, options: .notifyOthersOnDeactivation)
} catch {
errorMessage = "Failed to set up audio session: (error.localizedDescription)"
print(errorMessage ?? "")
}
}
// MARK: - Background Task Handling
private func setupBackgroundTaskHandling() {
// Handle app entering background
notificationObservers.append(
NotificationCenter.default.addObserver(
forName: UIApplication.didEnterBackgroundNotification,
object: nil,
queue: .main,
using: { [weak self] _ in
// Safely unwrap self
guard let self = self else { return }
self.handleBackgroundTransition()
}
)
)
I'm not sure if this is the code causing the issue. Any help would be gratefully appreciated. This is my first app I'm working on .
Topic:
Media Technologies
SubTopic:
Audio
I was testing audio playback from YouTube in Safari, and the sound was clipping heavily. At first, I thought it might be due to the poor quality of my small sound system. However, when I took a screenshot and the screenshot sound effect itself produced a loud clipping noise, it became clear that this is not a mechanical problem with my speakers, nor an issue specific to YouTube or Safari. This appears to be a system-wide audio issue in macOS Tahoe 26 - Beta 5.
I'm experiencing a significant limitation with MusicKit's Dolby Atmos implementation on macOS and would appreciate clarification on whether this is intended behavior or if there are solutions available.
When streaming Dolby Atmos content through MusicKit's ApplicationMusicPlayer, the output is limited to 2-channel stereo, even when:
Audio MIDI Setup is configured for 7.1.4 (12-channel) output
The same tracks play in full multichannel through the native Apple Music app
Dolby Atmos is set to "Automatic" in Apple Music preferences
Please let me know if there is anyway to enable this. If not, is this documented anywhere? Thanks!
My app has been using the iTunes Search API (itunes.apple.com/search) for a few years now, but at some point over the last week or so (late Sept. 2025) it is no longer returning track results with explicit content, regardless of whether I provide "explicit=Yes" (which is the default anyway, according to the API documentation - https://performance-partners.apple.com/search-api). Has anyone else experienced this with this API and have you figured out a workaround?
FYI, I do also use the more robust Apple Music API in another part of my app, which isn't going through this issue, so I know it's technically an alternative. I just need to stick with iTunes Search API in this particular case. Thanks.
I am trying to use SpeechDetector Module in Speech framework along with SpeechTranscriber. and it is giving me an error
Cannot convert value of type 'SpeechDetector' to expected element type 'Array.ArrayLiteralElement' (aka 'any SpeechModule')
Below is how I am using it
let speechDetector = Speech.SpeechDetector()
let transcriber = SpeechTranscriber(locale: Locale.current,
transcriptionOptions: [],
reportingOptions: [.volatileResults],
attributeOptions: [.audioTimeRange])
speechAnalyzer = try SpeechAnalyzer(modules: [transcriber,speechDetector])
I’ve never had a problem with any update before but as soon as I updated to 18.3 update my camera decided to start blurring when it’s in 1x & 2x, I use my camera daily for work and this is unacceptable. I’m wondering if anyone else is having this issue, it’s really frustrating..
I'm developing iPad app that will be mostly dedicated for certain external camera for visually impaired people.
The linux UVC api (e.g. using guvcview) allows to enable automatic exposure for the camera. IOs api "isExposureModeSupported" unfortunately returns false for any of the exposure modes.
Is it a bug? Or perhaps AVFoundation doesn't support UVC exposure yet?
Hello, our application is unable to HDMI output FairPlay protected content to TV via official Lightning HDMI AV Adapter, by checking the console log on mediaplayerd it is found that a CoreMediaErrorDomain Code=-19156 is raised, but we are unable to know what this error code means.
default 11:18:15.121584+0800 mediaplaybackd keyboss ckb_customURLReadCallback: 0x7fa62f800 60/0 customURLReqID 4 isComplete 1 err -19156 error <private> (0) dokeyCallbacksExist 0
default 11:18:15.121670+0800 mediaplaybackd keyboss ckb_processErrorForRequest: 0x7fa62f800 60/0 handler 4 err 0
default 11:18:15.121752+0800 mediaplaybackd <<<< FigCustomURLHandling >>>> curll_cancelRequestOnQueue: 0x7fa031360: requestID: 4
default 11:18:15.121932+0800 mediaplaybackd keyboss ckb_transitionRequestToTerminalState: 0x7fa62f800 60/0 reqFin err Error Domain=CoreMediaErrorDomain Code=-19156 (-19156) dokeyCallbacksExist 0
default 11:18:15.122025+0800 mediaplaybackd keyboss ckb_transitionRequestToTerminalState: 0x7fa62f800 60/0 retry
default 11:18:15.123195+0800 mediaplaybackd <<<< FigCPECryptorPKD >>>> PostKeyRequestErrorOccurred: 0x7fab7be80 029592C2-093D-400D-B57F-7AB06CC292D1 key request error: Error Domain=CoreMediaErrorDomain Code=-19160 (-19160)
Hi, is there a way to display the animated cover art in an app? Not every album has a cover art but for the ones that have one I would like to display them instead of the artwork.
Thank you :)
Hi team,
In the Apple Music Feed datasets, we've noticed some unexpected values in the song and album tables.
The primaryartists column from either song or album may contain a "non-default" artist name such as the katakana name shown in the example below:
select id, name, namedefault, primaryartists from amf_song where id = '1698723329'
id | name | namedefault | primaryartists
----------------------------------------
1698723329 | {default=California} | California | [{id=1264818718, name=チャペル・ローン}]
select * from amf_artist where id = '1264818718'
id | name | namedefault | namepronunciation |
----------------------------------------------
1264818718 | {default=Chappell Roan, ja=チャペル・ローン} | Chappell Roan | {ja=チャペルローン} |
Shouldn't the primaryartists column be showing the namedefault instead of the Japanese language version?
When can we expect this bug to resolved?
Thanks,
PLATFORM AND VERSION :iOS 18.5
I wanted to bring to your attention a critical issue some of our production users are experiencing with the CoinOut app. Specifically, users are encountering a problem when attempting to capture photos of receipts using the app's customized camera feature. The camera, which utilizes AVCaptureVideoPreviewLayer and AVCaptureDevice, occasionally fails to load the preview, resulting in a black screen instead of the expected camera view.
This camera blackout issue is significantly impacting the user experience as it prevents them from snapping photos of their receipts, which is a core functionality of the CoinOut app.
Any help/suggestion to this issue would be greatly appreciated.
STEPS TO REPRODUCE
Open the app and click on camera icon.
It will display camera to capture photo.
Camera shows black for few production user's.
class ViewController: UIViewController {
@IBOutlet private weak var captureButton: UIButton!
private var fillLayer: CAShapeLayer!
private var previewLayer : AVCaptureVideoPreviewLayer!
private var output: AVCapturePhotoOutput!
private var device: AVCaptureDevice!
private var session : AVCaptureSession!
private var highResolutionEnabled: Bool = false
private let sessionQueue = DispatchQueue(label: "session queue")
override func viewDidLoad() {
super.viewDidLoad()
setupCamera()
customiseUI()
}
@IBAction func startCamera(sender: UIButton) {
didTapTakePhoto()
}
private func setupCamera() {
let session = AVCaptureSession()
session.sessionPreset = AVCaptureSession.Preset.high
previewLayer = AVCaptureVideoPreviewLayer(session: session)
output = AVCapturePhotoOutput()
device = AVCaptureDevice.default(.builtInWideAngleCamera, for: AVMediaType.video, position: .back)
if let device = self.device{
do{
let input = try AVCaptureDeviceInput(device: device)
if session.canAddInput(input){ session.addInput(input)}
else { print("\(#fileID):\(#function):\(#line) : Session Input addition failed") }
if session.canAddOutput(output){
output.isHighResolutionCaptureEnabled = self.highResolutionEnabled
session.addOutput(output)
} else { print("\(#fileID):\(#function):\(#line) : Session Input high resolution failed") }
previewLayer.videoGravity = .resizeAspectFill
previewLayer.session = session
sessionQueue.async { session.startRunning() }
self.session = session
self.session.accessibilityElementIsFocused()
try device.lockForConfiguration()
if device.isWhiteBalanceModeSupported(AVCaptureDevice.WhiteBalanceMode.autoWhiteBalance) {
device.whiteBalanceMode = .autoWhiteBalance
} else { print("\(#fileID):\(#function):\(#line) : isWhiteBalanceModeSupported no supported") }
if device.isWhiteBalanceModeSupported(AVCaptureDevice.WhiteBalanceMode.continuousAutoWhiteBalance) {
device.whiteBalanceMode = .continuousAutoWhiteBalance
} else { print("\(#fileID):\(#function):\(#line) : isWhiteBalanceModeSupported no supported") }
if device.isFocusModeSupported(.continuousAutoFocus) { device.focusMode = .continuousAutoFocus}
else if device.isFocusModeSupported(.autoFocus) { device.focusMode = .autoFocus }
device.unlockForConfiguration()
} catch { print("\(#fileID):\(#function):\(#line) : \(error.localizedDescription)") }
} else { print("\(#fileID):\(#function):\(#line) : Device found as nil") }
}
private func customiseUI() {
let path = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height), cornerRadius: 0)
let rectangleWidth = view.frame.width - (view.frame.width * 0.16)
let x = (view.frame.width - rectangleWidth) / 2
let rectangleHeight = view.frame.height - (view.frame.height * 0.16)
let y = (view.frame.height - rectangleHeight) / 2
let roundRect = UIBezierPath(roundedRect: CGRect(x: x, y: y, width: rectangleWidth, height: rectangleHeight), byRoundingCorners:.allCorners, cornerRadii: CGSize(width: 0, height: 0))
roundRect.move(to: CGPoint(x: self.view.center.x , y: self.view.center.y))
path.append(roundRect)
path.usesEvenOddFillRule = true
fillLayer = CAShapeLayer()
fillLayer.path = path.cgPath
fillLayer.fillRule = .evenOdd
fillLayer.opacity = 0.4
previewLayer.addSublayer(fillLayer)
previewLayer.frame = view.bounds
view.layer.addSublayer(previewLayer)
view.bringSubviewToFront(captureButton)
}
private func didTapTakePhoto() {
let settings = self.getSettings(camera: self.device)
if device.isAdjustingFocus {
do {
try device.lockForConfiguration()
device.focusMode = .continuousAutoFocus
device.unlockForConfiguration()
device.addObserver(self, forKeyPath: "adjustingFocus", options: [.new], context: nil)
} catch { print(error) }
} else { output.capturePhoto(with: settings, delegate: self) }
}
func getSettings(camera: AVCaptureDevice) -> AVCapturePhotoSettings {
var settings = AVCapturePhotoSettings()
if let rawFormat = output.availableRawPhotoPixelFormatTypes.first {
settings = AVCapturePhotoSettings(rawPixelFormatType: OSType(rawFormat))
}
settings.isHighResolutionPhotoEnabled = self.highResolutionEnabled
let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
let previewFormat = [kCVPixelBufferPixelFormatTypeKey as String: previewPixelType] as [String : Any]
settings.previewPhotoFormat = previewFormat
return settings
}
}
extension ViewController: AVCapturePhotoCaptureDelegate {
func photoOutput(_ output: AVCapturePhotoOutput, willCapturePhotoFor resolvedSettings: AVCaptureResolvedPhotoSettings) {
AudioServicesDisposeSystemSoundID(1108)
}
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
guard let data = photo.fileDataRepresentation() else { return }
let image = UIImage(data: data)!
showImage(cropped: image)
}
func showImage(cropped: UIImage) {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "ImagePreviewViewController") as? ImagePreviewViewController
vc?.captured = cropped
self.present(vc!, animated: true)
}
}```
Hi all,
I'm trying to diagnose and resolve an issue with stuttering video playback using the standard AVPlayer. The video in question is a 4K, 39-second file in *.mov format, being played on an iOS device. It's served via a local HTTP server that proxies requests to a backend to fetch and process the content. The project uses end-to-end encrypted storage, which necessitates the proxy for handling data processing. While playback in offline scenarios is smooth, we are encountering issues with smooth playback during streaming. The same video streams smoothly on other platforms using the same connection, so network limitations are not a factor.
On iOS, playback is consistently choppy, with pauses every 1-3 seconds. The video does not appear to buffer adequately for smooth playback.
One particularly curious aspect is the seemingly random pattern of Content-Range requests made by the AVPlayer when streaming the video. Below is an example of the range requests:
Topic:
Media Technologies
SubTopic:
Video
I have an HDR10+ encoded video that if loaded as a mov plays back on the Apple Vision Pro but when that video is encoded using the latest (1.23b) Apple HLS tools to generate an fMP4 - the resulting m3u8 cannot be played back in the Apple Vision Pro and I only get back a "Cannot Open" error.
To generate the m3u8, I'm just calling mediafilesegmenter (with -iso-fragmented) and then variantplaylistcreator. This completes with no errors but the m3u8 will playback on the Mac using VLC but not on the Apple Vision Pro.
The relevant part of the m3u8 is:
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=40022507,BANDWIDTH=48883974,VIDEO-RANGE=PQ,CODECS="ec-3,hvc1.1.60000000.L180.B0",RESOLUTION=4096x4096,FRAME-RATE=24.000,CLOSED-CAPTIONS=NONE,AUDIO="audio1",REQ-VIDEO-LAYOUT="CH-STEREO"
{{url}}
Has anyone been able to use the HLS tools to generate fMP4s of MV-HEVC videos with HDR10?
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
Topic:
Media Technologies
SubTopic:
Streaming
Tags:
FairPlay Streaming
HTTP Live Streaming
AVFoundation