RPScreenRecorder.shared().startCapture无法写入/一直失败

当尝试使用ReplayKit录制和保存音频/视频时,我总是遇到错误。我在用

Xcode: Version 11.2.1
Swift 5
iOS 13
iPhone 7+ physical device

当我设置我已经使用的filePath时 URL(fileURLWithPath: ) .文件扩展名和 AVFileType 两者都是 .mp4 。我检查文件是否已存在于 FileManager 如果是这样,我将其删除: do { try FileManager.default.removeItem(at: videoURL) } 。我试图将路径本身更改为“库/缓存/”,如 @florianSAP answer 这不起作用。

这里有三个错误:

// 1. from recording
if !self.assetWriter.startWriting() {
    print("Can't write")
    return
}

// 2. from recording
if self.assetWriter.status == AVAssetWriter.Status.failed {
    print("StartCapture Error Occurred, Status = \(self.assetWriter.status.rawValue), \(self.assetWriter.error?.localizedDescription) \(self.assetWriter.error?.debugDescription)")
    return
}

// 3. this one is when trying to save the url in the PHAssetChangeRequest.creationRequestForAssetFromVideo completionHandler
if let error = error {
    print("PHAssetChangeRequest Video Error: \(error.localizedDescription)")
    return
}

// 4. this isn't an error but inside the switch rpSampleBufferType { } statement "not a video sample" kept printing out

错误消息如下:

发生StartCapture错误,状态=3,无法执行操作 complete可选(错误域=AVFoundationError域代码=-11800 “操作无法完成” UserInfo={NSLocalizedFailure原因=发生未知错误(-17508), NSLocalizedDescription=操作无法完成, NSUnderlyingError=0x2833a93b0{错误域=NSOSS状态错误域 代码=-17508“(空)”}})

PHAssetChangeRequest视频错误:操作无法完成。(PHPhotosErrorDomain 错误-1。)

我哪里做错了?

开始录制

let recorder = RPScreenRecorder.shared()
var assetWriter: AVAssetWriter!
var videoURL: URL!
var videoInput: AVAssetWriterInput!
var audioMicInput: AVAssetWriterInput!

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

videoURL = URL(fileURLWithPath: documentsPath.appending(UUID().uuidString + ".mp4"))

guard let videoURL = videoURL else { return }

do {
    try FileManager.default.removeItem(at: videoURL)
} catch {}

do {
    try assetWriter = AVAssetWriter(outputURL: videoURL, fileType: .mp4) // AVAssetWriter(url: videoURL, fileType: .mp4) didn't make a difference
} catch {}

let videoSettings: [String : Any] = [
    AVVideoCodecKey: AVVideoCodecType.h264,
    AVVideoWidthKey: view.bounds.width,
    AVVideoHeightKey: view.bounds.height
]

videoInput = AVAssetWriterInput(mediaType: .video, outputSettings: videoSettings)
videoInput.expectsMediaDataInRealTime = true
if assetWriter.canAdd(videoInput) {
    assetWriter.add(videoInput)
}

let audioSettings: [String:Any] = [AVFormatIDKey : kAudioFormatMPEG4AAC,
    AVNumberOfChannelsKey : 2,
    AVSampleRateKey : 44100.0,
    AVEncoderBitRateKey: 192000
]

audioMicInput = AVAssetWriterInput(mediaType: .audio, outputSettings: audioSettings)
audioMicInput.expectsMediaDataInRealTime = true
if assetWriter.canAdd(audioMicInput) {
    assetWriter.add(audioMicInput)
}

guard recorder.isAvailable else { return }

recorder.startCapture(handler: { (cmSampleBuffer, rpSampleBufferType, err) in

    if let err = err { return }

    // I tried to check if this was ready and added the below code to it but it made no difference
    // if CMSampleBufferDataIsReady(cmSampleBuffer) { ... the code below was put in here ... }

    DispatchQueue.main.async {

        switch rpSampleBufferType {
           case .video:

                if self.assetWriter.status == AVAssetWriter.Status.unknown {

                    if !self.assetWriter.startWriting() {
                        print("Can't write")
                        return
                    }

                    print("Starting writing")
                    self.assetWriter.startWriting()
                    self.assetWriter.startSession(atSourceTime:  CMSampleBufferGetPresentationTimeStamp(cmSampleBuffer))
                }

                if self.assetWriter.status == AVAssetWriter.Status.failed {
                    print("StartCapture Error Occurred, Status = \(self.assetWriter.status.rawValue), \(self.assetWriter.error?.localizedDescription) \(self.assetWriter.error?.debugDescription)")
                    return
                }

                if self.assetWriter.status == AVAssetWriter.Status.writing {
                    if self.videoInput.isReadyForMoreMediaData {
                        if self.videoInput.append(cmSampleBuffer) == false {
                            print("problem writing video")
                        }
                    }
                }

            case .audioMic:
                if self.audioMicInput.isReadyForMoreMediaData {
                    print("audioMic data added")
                    self.audioMicInput.append(cmSampleBuffer)
                }

            default:
                print("not a video sample")
            }
        }
    }

}, completionHandler: { (error) in

    if let error = error { return }
})

停止录制:

recorder.stopCapture { (error) in

    if let error = error { return }

    guard let videoInput = self.videoInput else { return }
    guard let audioMicInput = self.audioMicInput else { return }
    guard let assetWriter = self.assetWriter else { return }
    guard let videoURL = videoURL else { return }

    videoInput.markAsFinished()
    audioMicInput.markAsFinished()
    assetWriter.finishWriting(completionHandler: {

        PHPhotoLibrary.shared().performChanges({
                PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: videoUrl)
            }) { (saved, error) in

                if let error = error {
                    print("PHAssetChangeRequest Video Error: \(error.localizedDescription)")
                    return
                }

                if saved {
                    // ... show success message
                }
            }
    })
}

从未被调用的RPScreenRecorder代理:

func screenRecorder(_ screenRecorder: RPScreenRecorder, didStopRecordingWith previewViewController: RPPreviewViewController?, error: Error?) {
    if let error = error {
        print(error.localizedDescription)
    }
}