I've seen the Multiview feature on tvOS that displays a small grid icon when available. However, I only see this functionality in VisionOS using the AVMultiviewManager. Does a different name refer to this feature on tvOS? Relevant Links: https://www.reddit.com/r/appletv/comments/12opy5f/handson_with_the_new_multiview_split_screen/ https://www.pocket-lint.com/how-to-use-multiview-apple-tv/#:~:text=You'll%20see%20a%20grid,running%20at%20the%20same%20time.

We have developed a simple video player Swift application for macOS, which uses the AVFoundation Framework. A special feature of this app is the ability to play the video backward with speeds like -0.25x, -0.5x, and -1.0x. MP4 video file is played directly from the local file system, video codec is h.264, and audio AAC. Video files are huge, like 10 GB, and a length of 3 hours. Playing video in reverse direction works well on a Macbook Air with M1 or M2 chip. When we run the same app with the same video on a Macbook Air with M3 chip the reverse playback is much worse. Playback might stutter badly, especially in the latter part of the video. This same behavior also happens in Apple's Quicktime video player when playing in the reverse direction with -1x speed. What's even more strange is that at one point of a time, the video playback is totally smooth, but again, after a while, the playback is stuttering. For example, this morning reverse playback worked 100 % smoothly, then I rebooted the Mac and tried again: the result was stuttering. After this the Mac stayed idle for several hours and I tried to reverse play video again: smooth performance! My conclusion: M3 playback works fine if the stars in the sky are aligned correctly. :-) So it's not only our app, but also Quicktime player is having exactly the same behavior. And only with the M3 chip. The same symptom appears with another similar M3 Mac, so it can't be a single fault. At the same time, open-source video player iina can reverse play the video well on the same Mac. All Macs have otherwise identical configuration: 16 GB RAM and macOS 15.1.1. Have you experienced the same problem? Any chance to solve this problem? I really hope that the M4 chip Mac is behaving better here.

when I played a local video(I downloaded it to the sandbox)，KVO the AVPlayerItem status is AVPlayerItemStatusFailed and error is Error Domain=AVFoundationErrorDomain Code=-11800 "这项操作无法完成" UserInfo={NSLocalizedFailureReason=发生未知错误（24）, NSLocalizedDescription=这项操作无法完成, NSUnderlyingError=0x3004137e0 {Error Domain=NSPOSIXErrorDomain Code=24 "Too many open files"}} why?

Hi everyone, I'm developing a customization tool in which our customer can upload a mp3 or mp4 file that will be scannable through our AR application. On desktop and Android, this is working perfectly. For some reason however, on iPhone we're unable to load most of the video files. I've checked the clips, and they are .mov/h.264 files which are supported by iPhone. We're currently not sure how we can fix this issue to allow customers that own an iPhone to upload clips to our website. Any tips in the right direction are more than welcome. thanks in advance!

My app currently captures video using an AVCaptureSession set with the AVCaptureSessionPreset1920x1080 preset. However, I'd like to update this behavior, such that video can be recorded at a range of different resolutions. There isn't a preset aligning to each desired resolution, so I thought I'd instead directly set the AVCaptureDeviceFormat. For any desired resolution, I would find the format that is closest without going under the desired resolution, and then crop it down as a post-processing step. However, what I've observed is that there can be a range of available formats for a device at each resolution, with various differing settings. Presumably there is logic within AVCaptureSession that selects a reasonable default based on all these different settings, but since I am applying the format directly, I think I don't have a way to make use of that default logic? And it is undocumented? Does this mean that the only way to select a format is to implement a comparison function that considers all different values of all different properties on AVCaptureDeviceFormat, and then sort the formats according to this comparator? If so, what if some new property is added to AVCaptureDeviceFormat in the future? The sort would not take this new property into account, and the function might select a format with some new undesired property. Are there any guarantees about what types for formats will be supported on a device? For example, can I take for granted that a '420v' format will exist at each resolution? If so I could filter the formats down only to those with this setting without risking filtering out all of the supported formats. I suspect I may be missing something obvious. Any help would be greatly appreciated!

Hi, Im working on a app with a infinite scrollable video similar to Tiktok or instagram reels. I initially thought it would be a good idea to cache videos in the file system but after reading this post it seems like it is not recommended to cache videos on the file system: https://forums.developer.apple.com/forums/thread/649810#:~:text=If%20the%20videos%20can%20be%20reasonably%20cached%20in%20RAM%20then%20we%20would%20recommend%20that.%20Regularly%20caching%20video%20to%20disk%20contributes%20to%20NAND%20wear The reason I am hesitant to cache videos to memory is because this will add up pretty quickly and increase memory pressure for my app. After seeing the amount of documents and data storage that instagram stores, its obvious they are caching videos on the file system. So I was wondering what is the updated best practice for caching for these kind of apps?

Hello, To create a test project, I want to understand how the video and audio settings would look for a destination video whose content comes from a source video. I obtained the output from the source video in the audio and video tracks as follows: let audioSettings = [ AVFormatIDKey: kAudioFormatLinearPCM, AVSampleRateKey: 44100, AVNumberOfChannelsKey: 2 ] as [String : Any] var audioOutput = AVAssetReaderTrackOutput(track: audioTrack!, outputSettings: audioSettings) // Video let videoSettings = [ kCVPixelBufferPixelFormatTypeKey: kCVPixelFormatType_32BGRA, kCVPixelBufferWidthKey: videoTrack!.naturalSize.width, kCVPixelBufferHeightKey: videoTrack!.naturalSize.height ] as [String: Any] var videoOutput = AVAssetReaderTrackOutput(track: videoTrack!, outputSettings: videoSettings) With this, I'm obtaining the CMSampleBuffer using AVAssetReader.copyNextSampleBuffer . How can I add it to the destination video? Should I use a while loop, considering I already have the AVAssetWriter set up? Something like this: while let buffer = videoOutput.copyNextSampleBuffer() { if let imgBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) { let frame = imgBuffer as CVPixelBuffer let time = CMSampleBufferGetPresentationTimeStamp(sampleBuffer) adaptor.append(frame, withMediaTime: time) } } Lastly, regarding the destination video. How should the AVAssetWriterInput for audio and PixelBuffer of the destination video be set up? Provide an example, something like: let audioSettings = […] as [String: Any] Looking forward to your response.

Hello Apple Engineers, Specific Issue: I am working on a video recording feature in my SwiftUI app, and I am trying to record 4K60 video in ProRes Log format using the iPhone's internal storage. Here's what I have tried so far: I am using AVCaptureSession with AVCaptureMovieFileOutput and configuring the session to support 4K resolution and ProRes codec. The sessionPreset is set to .inputPriority, and the video device is configured with settings such as disabling HDR to prepare for Log. However, when attempting to record 4K60 ProRes video, I get the error: "Capturing 4k60 with ProRes codec on this device is supported only on external storage device." This error seems to imply that 4K60 ProRes recording is restricted to external storage devices. But I am trying to achieve this internally on devices such as the iPhone 15 Pro Max, which has native support for ProRes encoding. Here are my questions: Is it technically possible to record 4K60 ProRes Log video internally on supported iPhones (for example: iPhone 15 Pro Max)? There are some 3rd apps (i.e. Blackmagic 👍🏻) that can save 4K60 ProRes Log video on iPhone internally. If internal saving is supported, what additional configuration is needed for the AVCaptureSession or other technique to bypass this limitation? If anyone has successfully saved 4K60 ProRes Log video on iPhone internal storage, your guidance would be highly appreciated. Thank you for your help!

I want to use AVAssetWriter to output video files with a constant FPS (CFR) or variable bitrate (VBR). As far as I could search, I couldn't find out. How do I implement the settings?

i use navigator.mediaDevices.getUserMedia to wake up camera, when i use constraint with '{video:{facingMode: {exact: 'user'}}}'，occur a error"invalid constraint"

I tried running the latest CaptureSample, selected local/canonical HDR, add to screen output, then stop capture. It is supposed to save the file, but no file is added at all. It works for SDR, just not for HDR. How do I get HDR working?

Recently I've been trying to play some AV1-encoded streams on my iPhone 15 Pro Max. First, I check for hardware support: VTIsHardwareDecodeSupported(kCMVideoCodecType_AV1); // YES Then I need to create a CMFormatDescription in order to pass it into a VTDecompressionSession. I've tried the following: { mediaType:'vide' mediaSubType:'av01' mediaSpecific: { codecType: 'av01' dimensions: 394 x 852 } extensions: {{ CVFieldCount = 1; CVImageBufferChromaLocationBottomField = Left; CVImageBufferChromaLocationTopField = Left; CVPixelAspectRatio = { HorizontalSpacing = 1; VerticalSpacing = 1; }; FullRangeVideo = 0; }} } but VTDecompressionSessionCreate gives me error -8971 (codecExtensionNotFoundErr, I assume). So it has something to do with the extensions dictionary? I can't find anywhere which set of extensions is necessary for it to work 😿. VideoToolbox has convenient functions for creating descriptions of AVC and HEVC streams (CMVideoFormatDescriptionCreateFromH264ParameterSets and CMVideoFormatDescriptionCreateFromHEVCParameterSets), but not for AV1. As of today I am using XCode 15.0 with iOS 17.0.0 SDK.

My app is not a VOIP application. I use devices that support character centering, such as iPad 10 or iPad 13.18. The system is iOS 18.0, 18.1, or 18.1.1. When entering live classes, the "Character Centering" button does not appear in the control center, as shown in the following picture. However, if Voice over IP is selected for Background Modes in the project and the app is run again, it will not be reproduced, even if it is uninstalled or reinstalled. Could you please help me investigate the reason? thank you!

I am talking about AVCaptureVideoDataOutput.recommendedVideoSettings. I found sometimes it return nil, there is my test result. hevc .mov with activeColorSpace sRGB 60FPS -> ok 120FPS -> ok hevc .mov with activeColorSpace displayP3_HLG 60FPS -> nil 120FPS -> nil h264 .mov 30FPS -> ok 60FPS -> nil 120FPS -> nil so, if you don't give a recommend setting, and you don't give a document, how does developer to use it?

We are processing videos with Core Image filters in our apps, using an AVMutableVideoComposition (for playback/preview and export). For older devices, we want to limit the resolution at which the video frames are processed for performance and memory reasons. Ideally, we would tell AVFoundation to give us video frames with a defined maximum size into our composition. We thought setting the renderSize property of the composition to the desired size would do that. However, this only changes the size of output frames, not the size of the source frames that come into the composition's handler block. For example: let composition = AVMutableVideoComposition(asset: asset, applyingCIFiltersWithHandler: { request in let input = request.sourceImage // <- this still has the video's original size // ... }) composition.renderSize = CGSize(width: 1280, heigth: 720) // for example So if the user selects a 4K video, our filter chain gets 4K input frames. Sure, we can scale them down inside our pipeline, but this costs resources and especially a lot of memory. It would be way better if AVFoundation could decode the video frames in the desired size already before passing it into the composition handler. Is there a way to tell AVFoundation to load smaller video frames?

Hello, I.m deaf-blind programmer. I'm experiencing memory issues in my app. Essentially, I'm writing a video. In this output video, I get content from two sources. The first source is an already recorded video of 18 seconds (just for testing). It will be shown at the beginning of the output video. The second source is an array with photos and another array with audio buffers from AVSpeechSynthesizer.write(). The photos will be added along with the audio buffers to the output video, right after adding the 18-second video. So, in the end, the output video should be: 18-second video + array of photos as video images and, for audio, the buffers from AVSpeechSynthesizer.write(). However, my app crashes as soon as I start the first process. I'm using AVAssetWriter to write the video and AVAssetReader to read the video. Below, I'll show the code where I get the CMSampleBuffer. I'd like an example of how to add the 18-second video to the beginning of the output video. It doesn't need to be a big piece of code. Here it is: // Variables var audioReaderBuffers = [CMSAMPLEBUFFER]() var videoReaderBuffers = [(frame: CVPixelBuffer, time: CMTIME)]() // Get CMSampleBuffer of a video asset if let videoURL = videoURL { let videoAsset = AVAsset(url: videoURL) Task { let videoAssetTrack = try await videoAsset.loadTracks(withMediaType: .video).first! let audioTrack = try await videoAsset.loadTracks(withMediaType: .audio).first! let reader = try AVAssetReader(asset: videoAsset) let videoSettings = [ kCVPixelBufferPixelFormatTypeKey: kCVPixelFormatType_32BGRA, kCVPixelBufferWidthKey: videoAssetTrack.naturalSize.width, kCVPixelBufferHeightKey: videoAssetTrack.naturalSize.height ] as [String: Any] let readerVideoOutput = AVAssetReaderTrackOutput(track: videoAssetTrack, outputSettings: videoSettings) let audioSettings = [ AVFormatIDKey: kAudioFormatLinearPCM, AVSampleRateKey: 44100, AVNumberOfChannelsKey: 2 ] as [String : Any] let readerAudioOutput = AVAssetReaderTrackOutput(track: audioTrack, outputSettings: audioSettings) reader.add(readerVideoOutput) reader.add(readerAudioOutput) reader.startReading() // Video CMSampleBuffer while let sampleBuffer = readerVideoOutput.copyNextSampleBuffer() { autoreleasepool { if let imgBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) { let pixBuf = imgBuffer as CVPixelBuffer let pTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer) videoReaderBuffers.append((frame: pixBuf, time: pTime)) } } } if let videoURL = videoURL { let videoAsset = AVAsset(url: videoURL) Task { let videoAssetTrack = try await videoAsset.loadTracks(withMediaType: .video).first! let audioTrack = try await videoAsset.loadTracks(withMediaType: .audio).first! let reader = try AVAssetReader(asset: videoAsset) let videoSettings = [ kCVPixelBufferPixelFormatTypeKey: kCVPixelFormatType_32BGRA, kCVPixelBufferWidthKey: videoAssetTrack.naturalSize.width, kCVPixelBufferHeightKey: videoAssetTrack.naturalSize.height ] as [String: Any] let readerVideoOutput = AVAssetReaderTrackOutput(track: videoAssetTrack, outputSettings: videoSettings) let audioSettings = [ AVFormatIDKey: kAudioFormatLinearPCM, AVSampleRateKey: 44100, AVNumberOfChannelsKey: 2 ] as [String : Any] let readerAudioOutput = AVAssetReaderTrackOutput(track: audioTrack, outputSettings: audioSettings) reader.add(readerVideoOutput) reader.add(readerAudioOutput) reader.startReading() while let sampleBuffer = readerVideoOutput.copyNextSampleBuffer() { autoreleasepool { if let imgBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) { let pixBuf = imgBuffer as CVPixelBuffer let pTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer) }

I tried configuring the preferredForwardBufferDuration on devices using 4G and Wi-Fi, and in these cases, AVPlayer works correctly according to the configured buffer duration. However, when the device is connected to a 5G network, the configuration value no longer works. For example, if I set preferredForwardBufferDuration to 30 seconds, AVPlayer preloads with a buffer of over 100 seconds. I’m not sure how to resolve this, as it’s causing issues with my system.

Hello, First, some version and software details: Software: iOS 18.1 Hardware: iPhone 14 Pro Max and later Xcode: 16.0 Summary: AVAssetReader is not concatenating a video at the beginning of the output video. The output video should contain a scene of me introducing the content, followed by a blue screen with AVSpeechSynthesizer reading out a text that I pasted above the "Generate Video" button. Details: Now, let's talk about the app. Basically, I’m developing an app that generates a video with the following features: My app will create an output video that is split into an opening scene followed by a fully blue screen. The opening scene will be taken from a video I choose from my gallery. I will read the opening video using AVAssetReader as usual. After the opening scene, I will use the content of a text read by AVSpeechSynthesizer.write(). After the opening scene, the synthesized audio will start playing while the blue screen is displayed. All of this is already defined in the attached project. Each project file has a comment at the beginning introducing its content. How to test: Write something in the field above the "Generate Video" button. For example, type "Hello, world!" Then, press the "Library" button and select a video from the gallery, about 30 seconds long. That’s it. Press the "Generate Video" button. The result I’ve experienced is a crash or failure to generate the video. Practical example of what I want to achieve: Suppose I record a 30-second video where I say, "I’m going to tell you the story of Snow White." Then, I paste the "Snow White" story into the field above the "Generate Video" button. The output video should contain me saying, "I’m going to tell you the story of Snow White." After that, the AVSpeechSynthesizer will read the story I pasted, while displaying a blue screen. I look forward to a solution. Thank you very much! convertToCMSampleBuffer.swift convertToPixelBuffer.swift createInputs.swift createVideo.swift test.swift saveVideo.swift TestApp.swift editingVideo.swift sampleReaderProvider.swift misc.swift sampleProvider.swift

Looking to output dv video to my JVC SR-VS30 video deck. I used to be able to do this, but with most firewire stuff being deprecated, I'm not sure how to go about this. I found this old developer sample code that seems to do exactly what I'd like. Surely this could be rolled or updated for current macOS? https://developer.apple.com/library/archive/samplecode/SimpleVideoOut/Introduction/Intro.html#//apple_ref/doc/uid/DTS10000809-Intro-DontLinkElementID_2

We have had the same video player in our app for at least 5 years with few issues but the iOS 18 updated has now resulted in video playback for our users who have downloaded the video for offline viewing is now played at 2x speed.