尝试使用ReplayKit录制和保存音频/视频时，我一直收到错误消息。我在用着
Xcode: Version 11.2.1
Swift 5
iOS 13
iPhone 7+ physical device
设置filePath时，我已经在使用URL(fileURLWithPath: )。文件扩展名和
AVFileType均为.mp4。我检查文件是否已存在于FileManager中，如果存在，则将其删除：do { try FileManager.default.removeItem(at: videoURL) }。我试图将路径本身更改为“ Library / Caches /”，就像在@florianSAP answer中那样不起作用。这里有3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
错误消息是：
发生StartCapture错误，状态= 3，无法执行该操作
已完成可选（错误域= AVFoundationErrorDomain代码= -11800
“操作无法完成”
UserInfo = {NSLocalizedFailureReason =发生未知错误（-17508），
NSLocalizedDescription =操作无法完成，
NSUnderlyingError = 0x2833a93b0 {Error Domain = NSOSStatusErrorDomain
Code = -17508“（null）”}}）
PHAssetChangeRequest视频错误：该操作无法完成。 （PHPhotosErrorDomain
错误-1。）
我要去哪里错了？
开始录音
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 }
})
停止记录：
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
}
}
})
}
从未调用的RPScreenRecorder代表：
func screenRecorder(_ screenRecorder: RPScreenRecorder, didStopRecordingWith previewViewController: RPPreviewViewController?, error: Error?) {
if let error = error {
print(error.localizedDescription)
}
}
最佳答案
我可以通过做两件事来解决这个问题：
1-我要做的第一件事是将videoURL的filePath更改为：
// Old Way that was causing some sort of path error
videoURL = URL(fileURLWithPath: documentsPath.appending(UUID().uuidString + ".mp4"))
// This is what the Old Path looked like. Look at the series of numbers beginning with 506... directly after Documents
///var/mobile/Containers/Data/Application/AAEF38A2-7AF1-4A32-A612-296B1584A764/Documents506D36BA-0C27-466A-A0BA-C197481F471A.mp4
至
// New Way that got the path to work
let dirPath = "\(documentsPath)/Videos_\(UUID().uuidString).mp4"
videoURL = URL(fileURLWithPath: dirPath)
// This is what the new path looks like. After Documents there is now a forward slash, the word Videos with an underscore, and then the series of numbers beginning with 506...
///var/mobile/Containers/Data/Application/AAEF38A2-7AF1-4A32-A612-296B1584A764/Documents/Videos_506D36BA-0C27-466A-A0BA-C197481F471A.mp4
2-我所做的第二件事是更改
recorder.startCapture(handler: { (cmSampleBuffer, rpSampleBufferType, err)中的代码：recorder.startCapture(handler: { (cmSampleBuffer, rpSampleBufferType, err) in
if let err = err { return }
if CMSampleBufferDataIsReady(cmSampleBuffer) {
DispatchQueue.main.async {
switch rpSampleBufferType {
case .video:
print("writing sample....")
if self.assetWriter?.status == AVAssetWriter.Status.unknown {
print("Started 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 {
print("Writing a sample")
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 }
})
这与我遇到的实际问题无关，但如果音频不同步，则必须在下面将此代码添加到
viewDidLoad。我从comments section here那里得到的。do {
try AVAudioSession.sharedInstance().setCategory(.playAndRecord, mode: .videoRecording, options: [.defaultToSpeaker])
try AVAudioSession.sharedInstance().setActive(true, options: .notifyOthersOnDeactivation)
} catch {
#if DEBUG
print("Setting category to AVAudioSessionCategoryPlayback failed.")
#endif
}
如果需要查找错误代码的含义，可以在这里https://www.osstatus.com。它帮助我找到了该问题的
11800，但没有找到17508。关于ios - RPScreenRecorder.shared()。startCapture将不会写入/继续失败，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/59613660/