{"id":3470,"date":"2021-07-14T10:58:52","date_gmt":"2021-07-14T02:58:52","guid":{"rendered":"http:\/\/123.57.164.21\/?p=3470"},"modified":"2021-07-15T16:34:22","modified_gmt":"2021-07-15T08:34:22","slug":"iphone%e7%ab%af%e5%bd%95%e5%83%8f-%e5%88%a9%e7%94%a8avassetwriter%e7%94%9f%e6%88%90h264%e6%96%87%e4%bb%b6demo","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=3470","title":{"rendered":"iPhone\u7aef\u5f55\u50cf \u5229\u7528AVAssetWriter\u751f\u6210H264\u6587\u4ef6Demo"},"content":{"rendered":"\n<p>iPhone\u5229\u7528AVFoundation\u5f55\u50cf\u65f6\uff0cDefault\u751f\u6210H265\u7684\u89c6\u9891\u6587\u4ef6\uff0c\u8fd9\u4e2a\u6587\u4ef6\u53ea\u5728Safari\u6d4f\u89c8\u5668\u4e2d\u80fd\u76f4\u63a5\u89e3\u7801\uff0c\u5982\u679c\u60f3\u8981\u5728\u8c37\u6b4c\uff0c\u706b\u72d0\u6d4f\u89c8\u5668\u76f4\u63a5\u64ad\u653e\u7684\u8bdd\uff0c\u9700\u8981\u8f6c\u6210H264\u7684\u7f16\u7801\uff0cIOS\u63d0\u4f9b\u4e86AVAssetWriter\u53ef\u4ee5\u76f4\u63a5\u751f\u6210H264\u7684\u89c6\u9891\u6587\u4ef6\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Demo1\uff1a\u4ee5\u4e0b\u662fAVAssetWriterDemo\uff1ahttps:\/\/github.com\/yinweisu\/AVAssetWriterDemo<\/h5>\n\n\n\n<p>\u8fd9\u4e2aDemo\u6ca1\u6709\u6355\u6349\u97f3\u9891\uff0c\u6ca1\u6709\u58f0\u97f3\uff0c\u53ef\u4ee5\u770b\u7b2c\u4e8c\u4e2aDemo\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"493\" height=\"1024\" src=\"http:\/\/123.57.164.21\/wp-content\/uploads\/2021\/07\/image-62-493x1024.png\" alt=\"\" class=\"wp-image-3477\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-62-493x1024.png 493w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-62-145x300.png 145w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-62-230x477.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-62-350x726.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-62-480x996.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-62.png 740w\" sizes=\"(max-width: 493px) 100vw, 493px\" \/><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/123.57.164.21\/wp-content\/uploads\/2021\/07\/image-60.png\" alt=\"\" class=\"wp-image-3473\" width=\"350\" height=\"298\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-60-768x657.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-60-830x710.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-60-230x197.png 230w\" sizes=\"(max-width: 350px) 100vw, 350px\" \/><\/figure><\/div>\n\n\n\n<ul><li>ViewController.swift<\/li><\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/\n\/\/  ViewController.swift\n\/\/  AVAssetWriterDemo\n\/\/\n\/\/  Created by Weisu Yin on 5\/6\/20.\n\/\/  Copyright \u00a9 2020 UCDavis. All rights reserved.\n\nimport UIKit\nimport AVFoundation\nimport AVKit\n\nclass ViewController: UIViewController, AVCaptureVideoDataOutputSampleBufferDelegate {\n    \n    @IBOutlet weak var previewView: UIView!\n    @IBOutlet weak var recordButton: UIButton!\n    var recording = false {\n        didSet {\n            recording ? self.start() : self.stop()\n        }\n    }\n    \n    let captureSession = AVCaptureSession()\n    lazy var previewLayer = AVCaptureVideoPreviewLayer(session: self.captureSession)\n    \n    var videoDataOutput: AVCaptureVideoDataOutput?\n    var assetWriter: AVAssetWriter?\n    var assetWriterInput: AVAssetWriterInput?\n    var filePath: URL?\n    var sessionAtSourceTime: CMTime?\n    \n    override func viewDidLoad() {\n        super.viewDidLoad()\n        self.recording = false\n        self.requestCameraPermission()\n    }\n    \n    @IBAction func recordButtonPressed(_ sender: Any) {\n        recording.toggle()\n    }\n    \n    @IBAction func playRecordedVideo(_ sender: Any) {\n        guard let url = filePath else {\n            print(\"Can't get video url\")\n            return\n        }\n         let player = AVPlayer(url: url)\n         let playerController = AVPlayerViewController()\n         playerController.player = player\n         present(playerController, animated: true) {\n             player.play()\n         }\n    }\n    \/\/ \u5224\u65ad\u6444\u50cf\u5934\u6743\u9650\n    func requestCameraPermission() {\n        switch AVCaptureDevice.authorizationStatus(for: .video) {\n        case .authorized:\n            self.setupCaptureSession()\n            \n        case .notDetermined:\n            AVCaptureDevice.requestAccess(for: .video) { granted in\n                if granted {\n                    DispatchQueue.main.async {\n                        self.setupCaptureSession()\n                    }\n                }\n            }\n            \n        case .denied:\n            return\n            \n        case .restricted:\n            return\n        @unknown default:\n            fatalError()\n        }\n    }\n    \n    \/\/ \u521d\u59cb\u5316 CaptureSession\n    func setupCaptureSession() {\n        self.captureSession.beginConfiguration()\n        guard let videoCaptureDevice = AVCaptureDevice.default(for: .video) else { return }\n        \n        \/\/ \u6dfb\u52a0\u89c6\u9891 \u8f93\u5165\u8bbe\u5907\n        guard let videoDeviceInput = try? AVCaptureDeviceInput(device: videoCaptureDevice), self.captureSession.canAddInput(videoDeviceInput)\n            else { return }\n        self.captureSession.addInput(videoDeviceInput)\n        \n        \/\/ \u8bbe\u5b9a\u8f93\u51fa\u662fAVCaptureVideoDataOutput\u7c7b\u578b\n        let tempVideoDataOutput = AVCaptureVideoDataOutput()\n        tempVideoDataOutput.alwaysDiscardsLateVideoFrames = true\n        tempVideoDataOutput.videoSettings = [kCVPixelBufferPixelFormatTypeKey as String: Int(kCVPixelFormatType_420YpCbCr8BiPlanarFullRange)]\n        tempVideoDataOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: \"videoQueue\"))\n        \n        self.captureSession.addOutput(tempVideoDataOutput)\n        \n        self.captureSession.commitConfiguration()\n        self.captureSession.startRunning()\n        \n        self.videoDataOutput = tempVideoDataOutput\n        self.previewLayer.frame = self.previewView.frame\n        self.previewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill\n        self.view.layer.addSublayer(previewLayer)\n        self.setUpWriter()\n    }\n    \n     \/\/ This mothod will overwrite previous video files\n    func videoFileLocation() -> URL {\n        let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString\n        let videoOutputUrl = URL(fileURLWithPath: documentsPath.appendingPathComponent(\"videoFile\")).appendingPathExtension(\"mov\")\n        do {\n        if FileManager.default.fileExists(atPath: videoOutputUrl.path) {\n            try FileManager.default.removeItem(at: videoOutputUrl)\n            print(\"file removed\")\n        }\n        } catch {\n            print(error)\n        }\n\n        return videoOutputUrl\n    }\n    \n    \/\/ \u8bbe\u7f6eAVAssetWriter\n    func setUpWriter() {\n        do {\n            filePath = videoFileLocation()\n            assetWriter = try AVAssetWriter(outputURL: filePath!, fileType: AVFileType.mov)\n\n            \/\/ add video input\n            let settings = self.videoDataOutput?.recommendedVideoSettingsForAssetWriter(writingTo: .mp4)\n            assetWriterInput = AVAssetWriterInput(mediaType: .video, outputSettings: [\n            AVVideoCodecKey : AVVideoCodecType.h264,\n            AVVideoWidthKey : 720,\n            AVVideoHeightKey : 1280,\n            AVVideoCompressionPropertiesKey : [\n                AVVideoAverageBitRateKey : 2300000,\n                ],\n            ])\n            guard let assetWriterInput = assetWriterInput, let assetWriter = assetWriter else { return }\n            assetWriterInput.expectsMediaDataInRealTime = true\n\/\/            assetWriterInput.transform = CGAffineTransform(rotationAngle: .pi\/2) \/\/ Adapt to portrait mode\n            \n            if assetWriter.canAdd(assetWriterInput) {\n                assetWriter.add(assetWriterInput)\n                print(\"asset input added\")\n            } else {\n                print(\"no input added\")\n            }\n\n            assetWriter.startWriting()\n            \n            self.assetWriter = assetWriter\n            self.assetWriterInput = assetWriterInput\n        } catch let error {\n            debugPrint(error.localizedDescription)\n        }\n    }\n\n    func canWrite() -> Bool {\n        return recording &amp;&amp; assetWriter != nil &amp;&amp; assetWriter?.status == .writing\n    }\n    \n    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {\n        connection.videoOrientation = .portrait\n        guard self.recording else { return }\n        \n        let writable = self.canWrite()\n\n        if writable, self.sessionAtSourceTime == nil {\n            \/\/ start writing\n            sessionAtSourceTime = CMSampleBufferGetOutputPresentationTimeStamp(sampleBuffer)\n            self.assetWriter?.startSession(atSourceTime: sessionAtSourceTime!)\n        }\n        guard let assetWriterInput = self.assetWriterInput else { return }\n        if writable, assetWriterInput.isReadyForMoreMediaData {\n            \/\/ write video buffer\n            assetWriterInput.append(sampleBuffer)\n        }\n\n    }\n\n    func start() {\n        self.recordButton.setTitle(\"Stop\", for: .normal)\n        self.sessionAtSourceTime = nil\n        self.setUpWriter()\n        switch self.assetWriter?.status {\n        case .writing:\n            print(\"status writing\")\n        case .failed:\n            print(\"status failed\")\n        case .cancelled:\n            print(\"status cancelled\")\n        case .unknown:\n            print(\"status unknown\")\n        default:\n            print(\"status completed\")\n        }\n\n    }\n\n    func stop() {\n        self.recordButton.setTitle(\"Record\", for: .normal)\n        self.assetWriterInput?.markAsFinished()\n        print(\"marked as finished\")\n        self.assetWriter?.finishWriting { [weak self] in\n            self?.sessionAtSourceTime = nil\n        }\n        print(\"finished writing \\(self.filePath)\")\n    }\n\n}\n<\/pre>\n\n\n\n<ul><li>info.plist<\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"368\" src=\"http:\/\/123.57.164.21\/wp-content\/uploads\/2021\/07\/image-61-1024x368.png\" alt=\"\" class=\"wp-image-3474\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-61-1024x368.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-61-300x108.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-61-768x276.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-61-1536x552.png 1536w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-61-2048x736.png 2048w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-61-830x298.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-61-230x83.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-61-350x126.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2021\/07\/image-61-480x172.png 480w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n\n<h5 class=\"wp-block-heading\">Demo2:\u8fd9\u4e2aDemo\u5f55\u5236\u7684\u89c6\u9891\u6587\u4ef6\u6709\u58f0\u97f3<\/h5>\n\n\n\n<p><a href=\"https:\/\/stackoverflow.com\/questions\/48569738\/swift-4-avfoundation-screen-and-audio-recording-using-avassetwriter-on-mac-os\">https:\/\/stackoverflow.com\/questions\/48569738\/swift-4-avfoundation-screen-and-audio-recording-using-avassetwriter-on-mac-os<\/a><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/\n\/\/  ViewController.swift\n\/\/  CustomCamera\n\/\/\n\/\/  Created by Taras Chernyshenko on 6\/27\/17.\n\/\/  Copyright \u00a9 2017 Taras Chernyshenko. All rights reserved.\n\/\/\nimport AVFoundation\nimport Photos\n\nclass NewRecorder: NSObject,\n  AVCaptureAudioDataOutputSampleBufferDelegate,\nAVCaptureVideoDataOutputSampleBufferDelegate {\n\n  private var session: AVCaptureSession = AVCaptureSession()\n  private var deviceInput: AVCaptureScreenInput?\n  private var previewLayer: AVCaptureVideoPreviewLayer?\n  private var videoOutput: AVCaptureVideoDataOutput = AVCaptureVideoDataOutput()\n  private var audioOutput: AVCaptureAudioDataOutput = AVCaptureAudioDataOutput()\n\n  \/\/private var videoDevice: AVCaptureDevice = AVCaptureScreenInput(displayID: 69731840) \/\/AVCaptureDevice.default(for: AVMediaType.video)!\n  private var audioConnection: AVCaptureConnection?\n  private var videoConnection: AVCaptureConnection?\n\n  private var assetWriter: AVAssetWriter?\n  private var audioInput: AVAssetWriterInput?\n  private var videoInput: AVAssetWriterInput?\n\n  private var fileManager: FileManager = FileManager()\n  private var recordingURL: URL?\n\n  private var isCameraRecording: Bool = false\n  private var isRecordingSessionStarted: Bool = false\n\n  private var recordingQueue = DispatchQueue(label: \"recording.queue\")\n\n\n  func setup() {\n    self.session.sessionPreset = AVCaptureSession.Preset.high\n\n    self.recordingURL = URL(fileURLWithPath: \"\\(NSTemporaryDirectory() as String)\/file.mp4\")\n    if self.fileManager.isDeletableFile(atPath: self.recordingURL!.path) {\n      _ = try? self.fileManager.removeItem(atPath: self.recordingURL!.path)\n    }\n\n    self.assetWriter = try? AVAssetWriter(outputURL: self.recordingURL!,\n                                          fileType: AVFileType.mp4)\n    self.assetWriter!.movieFragmentInterval = kCMTimeInvalid\n    self.assetWriter!.shouldOptimizeForNetworkUse = true\n\n    let audioSettings = [\n      AVFormatIDKey : kAudioFormatMPEG4AAC,\n      AVNumberOfChannelsKey : 2,\n      AVSampleRateKey : 44100.0,\n      AVEncoderBitRateKey: 192000\n      ] as [String : Any]\n\n    let videoSettings = [\n      AVVideoCodecKey : AVVideoCodecType.h264,\n      AVVideoWidthKey : 1920,\n      AVVideoHeightKey : 1080\n      \/*AVVideoCompressionPropertiesKey: [\n        AVVideoAverageBitRateKey:  NSNumber(value: 5000000)\n      ]*\/\n      ] as [String : Any]\n\n    self.videoInput = AVAssetWriterInput(mediaType: AVMediaType.video,\n                                         outputSettings: videoSettings)\n    self.audioInput = AVAssetWriterInput(mediaType: AVMediaType.audio,\n                                         outputSettings: audioSettings)\n\n    self.videoInput?.expectsMediaDataInRealTime = true\n    self.audioInput?.expectsMediaDataInRealTime = true\n\n    if self.assetWriter!.canAdd(self.videoInput!) {\n      self.assetWriter?.add(self.videoInput!)\n    }\n\n    if self.assetWriter!.canAdd(self.audioInput!) {\n      self.assetWriter?.add(self.audioInput!)\n    }\n\n    \/\/self.deviceInput = try? AVCaptureDeviceInput(device: self.videoDevice)\n    self.deviceInput = AVCaptureScreenInput(displayID: 724042646)\n    self.deviceInput!.minFrameDuration = CMTimeMake(1, Int32(30))\n    self.deviceInput!.capturesCursor = true\n    self.deviceInput!.capturesMouseClicks = true\n\n    if self.session.canAddInput(self.deviceInput!) {\n      self.session.addInput(self.deviceInput!)\n    }\n\n    self.previewLayer = AVCaptureVideoPreviewLayer(session: self.session)\n\n    \/\/importent line of code what will did a trick\n    \/\/self.previewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill\n\n    \/\/let rootLayer = self.view.layer\n    \/\/rootLayer.masksToBounds = true\n    \/\/self.previewLayer?.frame = CGRect(x: 0, y: 0, width: 1920, height: 1080)\n\n    \/\/rootLayer.insertSublayer(self.previewLayer!, at: 0)\n\n    self.session.startRunning()\n\n    DispatchQueue.main.async {\n      self.session.beginConfiguration()\n\n      if self.session.canAddOutput(self.videoOutput) {\n        self.session.addOutput(self.videoOutput)\n      }\n\n      self.videoConnection = self.videoOutput.connection(with: AVMediaType.video)\n      \/*if self.videoConnection?.isVideoStabilizationSupported == true {\n        self.videoConnection?.preferredVideoStabilizationMode = .auto\n      }*\/\n      self.session.commitConfiguration()\n\n      let audioDevice = AVCaptureDevice.default(for: AVMediaType.audio)\n      let audioIn = try? AVCaptureDeviceInput(device: audioDevice!)\n\n      if self.session.canAddInput(audioIn!) {\n        self.session.addInput(audioIn!)\n      }\n\n      if self.session.canAddOutput(self.audioOutput) {\n        self.session.addOutput(self.audioOutput)\n      }\n\n      self.audioConnection = self.audioOutput.connection(with: AVMediaType.audio)\n    }\n  }\n\n  func startRecording() {\n    if self.assetWriter?.startWriting() != true {\n      print(\"error: \\(self.assetWriter?.error.debugDescription ?? \"\")\")\n    }\n\n    self.videoOutput.setSampleBufferDelegate(self, queue: self.recordingQueue)\n    self.audioOutput.setSampleBufferDelegate(self, queue: self.recordingQueue)\n  }\n\n  func stopRecording() {\n    self.videoOutput.setSampleBufferDelegate(nil, queue: nil)\n    self.audioOutput.setSampleBufferDelegate(nil, queue: nil)\n\n    self.assetWriter?.finishWriting {\n      print(\"Saved in folder \\(self.recordingURL!)\")\n      exit(0)\n    }\n  }\n  func captureOutput(_ captureOutput: AVCaptureOutput, didOutput\n    sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {\n\n    if !self.isRecordingSessionStarted {\n      let presentationTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer)\n      self.assetWriter?.startSession(atSourceTime: presentationTime)\n      self.isRecordingSessionStarted = true\n    }\n\n    let description = CMSampleBufferGetFormatDescription(sampleBuffer)!\n\n    if CMFormatDescriptionGetMediaType(description) == kCMMediaType_Audio {\n      if self.audioInput!.isReadyForMoreMediaData {\n        \/\/print(\"appendSampleBuffer audio\");\n        self.audioInput?.append(sampleBuffer)\n      }\n    } else {\n      if self.videoInput!.isReadyForMoreMediaData {\n        \/\/print(\"appendSampleBuffer video\");\n        if !self.videoInput!.append(sampleBuffer) {\n          print(\"Error writing video buffer\");\n        }\n      }\n    }\n  }\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>iPhone\u5229\u7528AVFoundation\u5f55\u50cf\u65f6\uff0cDefault\u751f\u6210H265\u7684\u89c6\u9891\u6587\u4ef6\uff0c\u8fd9\u4e2a\u6587\u4ef6\u53ea\u5728Safari [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,8],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/3470"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3470"}],"version-history":[{"count":7,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/3470\/revisions"}],"predecessor-version":[{"id":3482,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/3470\/revisions\/3482"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3470"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3470"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3470"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}