iOS的11 replaykit资产作家身份失败随机

Question

使用案例

我使用的是iOS 11 Replaykit框架，试图从画面记录帧，并从应用程序和麦克风音频。

问题

随机，当我把我的.append（sampleBuffer）获得AVAssetWriterStatus.failed与AssetWriter.Error显示

Error Domain=AVFoundationErrorDomain Code=-11823 "Cannot Save" UserInfo={NSLocalizedRecoverySuggestion=Try saving again., NSLocalizedDescription=Cannot Save, NSUnderlyingError=0x1c044c360 {Error Domain=NSOSStatusErrorDomain Code=-12412 "(null)"}}

枝节问题：我玩重复的声音时，应用程序是记录尝试验证录制的音频，但是当我开始录制时，即使在视频和外部音频麦克风正在工作的位置，声音也会停止。

如果您需要更多信息，我可以将其他代码上传到GitHub。

理念

因为有时记录保存（我可以导出到照片应用程序和回放视频），我认为它必须是异步的问题在那里我装出来的东西秩序。请让我知道，如果你看到任何！

我想要的一个想法是将文件保存到/ Documents中的自己的文件夹，而不是直接发送给/ Documents，以防出现奇怪的权限错误。虽然我相信这会造成一致的错误，而不是仅仅有时会破裂。

我的代码

func startRecording() { 
    guard let firstDocumentDirectoryPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first else { return } 

    let directoryContents = try! FileManager.default.contentsOfDirectory(at: URL(fileURLWithPath: firstDocumentDirectoryPath), includingPropertiesForKeys: nil, options: []) 
    print(directoryContents) 

    videoURL = URL(fileURLWithPath: firstDocumentDirectoryPath.appending("/\(arc4random()).mp4")) 

    print(videoURL.absoluteString) 

    assetWriter = try! AVAssetWriter(url: videoURL, fileType: AVFileType.mp4) 

    let compressionProperties:[String:Any] = [...] 
    let videoSettings:[String:Any] = [...] 
    let audioSettings:[String:Any] = [...] 

    videoInput = AVAssetWriterInput(mediaType: .video, outputSettings: videoSettings) 
    audioMicInput = AVAssetWriterInput(mediaType: .audio, outputSettings: audioSettings) 
    audioAppInput = AVAssetWriterInput(mediaType: .audio, outputSettings: audioSettings) 

    guard let assetWriter = assetWriter else { return } 
    guard let videoInput = videoInput else { return } 
    guard let audioAppInput = audioAppInput else { return } 
    guard let audioMicInput = audioMicInput else { return } 

    videoInput.mediaTimeScale = 60 
    videoInput.expectsMediaDataInRealTime = true 
    audioMicInput.expectsMediaDataInRealTime = true 
    audioAppInput.expectsMediaDataInRealTime = true 

    if assetWriter.canAdd(videoInput) { 
     assetWriter.add(videoInput) 
    } 

    if assetWriter.canAdd(audioAppInput) { 
     assetWriter.add(audioAppInput) 
    } 

    if assetWriter.canAdd(audioMicInput) { 
     assetWriter.add(audioMicInput) 
    } 

    assetWriter.movieTimeScale = 60 

    RPScreenRecorder.shared().startCapture(handler: recordingHandler(sampleBuffer:sampleBufferType:error:)) { (error:Error?) in 
     if error != nil { 
      print("RPScreenRecorder.shared().startCapture: \(error.debugDescription)") 
     } else { 
      print("start capture complete") 
     } 
    } 
} 

func recordingHandler (sampleBuffer:CMSampleBuffer, sampleBufferType:RPSampleBufferType, error:Error?){ 
    if error != nil { 
     print("recordingHandler: \(error.debugDescription)") 
    } 

    if CMSampleBufferDataIsReady(sampleBuffer) { 
     guard let assetWriter = assetWriter else { return } 
     guard let videoInput = videoInput else { return } 
     guard let audioAppInput = audioAppInput else { return } 
     guard let audioMicInput = audioMicInput else { return } 

     if assetWriter.status == AVAssetWriterStatus.unknown { 
      print("AVAssetWriterStatus.unknown") 
      if !assetWriter.startWriting() { 
       return 
      } 
      assetWriter.startSession(atSourceTime: CMSampleBufferGetPresentationTimeStamp(sampleBuffer)) 
     } 

     if assetWriter.status == AVAssetWriterStatus.failed { 
      print("AVAssetWriterStatus.failed") 
      print("assetWriter.error: \(assetWriter.error.debugDescription)") 
      return 
     } 

     if sampleBufferType == RPSampleBufferType.video { 
      if videoInput.isReadyForMoreMediaData { 
       print("=appending video data") 
       videoInput.append(sampleBuffer) 
      } 
     } 

     if sampleBufferType == RPSampleBufferType.audioApp { 
      if audioAppInput.isReadyForMoreMediaData { 
       print("==appending app audio data") 
       audioAppInput.append(sampleBuffer) 
      } 
     } 

     if sampleBufferType == RPSampleBufferType.audioMic { 
      if audioMicInput.isReadyForMoreMediaData { 
       print("===appending mic audio data") 
       audioMicInput.append(sampleBuffer) 
      } 
     } 
    } 
} 

func stopRecording() { 
    RPScreenRecorder.shared().stopCapture { (error) in 
     guard let assetWriter = self.assetWriter else { return } 
     guard let videoInput = self.videoInput else { return } 
     guard let audioAppInput = self.audioAppInput else { return } 
     guard let audioMicInput = self.audioMicInput else { return } 

     if error != nil { 
      print("recordingHandler: \(error.debugDescription)") 
     } else { 
      videoInput.markAsFinished() 
      audioMicInput.markAsFinished() 
      audioAppInput.markAsFinished() 

      assetWriter.finishWriting(completionHandler: { 
       print(self.videoURL) 
       self.saveToCameraRoll(URL: self.videoURL) 
      }) 
     } 
    } 
} 

Answer 1

我有类似的问题。我首先检查videoURL文件是否已经存在。如果是这样，请先将其删除，然后错误消失。