我想同时录制视频和播放音频。当开始录制视频时,预先加载的音频开始播放,当停止视频录制时,音频也停止播放。
我尝试使用第三方库"SwiftyCam“(https://github.com/Awalz/SwiftyCam)录制视频,并在start写入视频录制文件时使用委托方法开始播放音频。
主ViewCOntroller代码如下:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
var temp = Data()
let audioPath = Bundle.main.path(forResource: "ab1-FAST", ofType: "mp3")
temp = FileManager.default.contents(atPath: (audioPath)!)!
do {
player = try AVAudioPlayer(data: temp)
}
catch let error {
print(error)
}
self.configureAudioSession()
player!.delegate = self
self.player!.prepareToPlay()
}
// MARK: -
// MARK: - SwiftyCamViewControllerDelegate method
func swiftyCam(_ swiftyCam: SwiftyCamViewController, didBeginRecordingVideo camera: SwiftyCamViewController.CameraSelection) {
self.player?.play()
}
func swiftyCam(_ swiftyCam: SwiftyCamViewController, didFinishRecordingVideo camera: SwiftyCamViewController.CameraSelection)
{
if self.player != nil{
if (self.player?.isPlaying)! {
self.player?.stop()
}
}
}
@IBAction func btnStartStopClick(_ sender: UIButton) {
sender.isSelected = !sender.isSelected
if sender.isSelected{
DispatchQueue.main.async {
self.objVideoRecorderVC.startVideoRecording()
}
}else{
self.objVideoRecorderVC.stopVideoRecording()
}
}
swiftycam库:
/**
Begin recording video of current session
SwiftyCamViewControllerDelegate function SwiftyCamDidBeginRecordingVideo() will be called
*/
public func startVideoRecording() {
guard let movieFileOutput = self.movieFileOutput else {
return
}
if currentCamera == .rear && flashEnabled == true {
enableFlash()
}
if currentCamera == .front && flashEnabled == true {
flashView = UIView(frame: view.frame)
flashView?.backgroundColor = UIColor.white
flashView?.alpha = 0.85
previewLayer.addSubview(flashView!)
}
sessionQueue.async { [unowned self] in
if !movieFileOutput.isRecording {
if UIDevice.current.isMultitaskingSupported {
self.backgroundRecordingID = UIApplication.shared.beginBackgroundTask(expirationHandler: nil)
}
// Update the orientation on the movie file output video connection before starting recording.
let movieFileOutputConnection = self.movieFileOutput?.connection(withMediaType: AVMediaTypeVideo)
//flip video output if front facing camera is selected
if self.currentCamera == .front {
movieFileOutputConnection?.isVideoMirrored = true
}
movieFileOutputConnection?.videoOrientation = self.getVideoOrientation()
// Start recording to a temporary file.
let outputFileName = UUID().uuidString
let outputFilePath = (NSTemporaryDirectory() as NSString).appendingPathComponent((outputFileName as NSString).appendingPathExtension("mov")!)
movieFileOutput.startRecording(toOutputFileURL: URL(fileURLWithPath: outputFilePath), recordingDelegate: self)
self.isVideoRecording = true
DispatchQueue.main.async {
self.cameraDelegate?.swiftyCam(self, didBeginRecordingVideo: self.currentCamera)
}
}
else {
movieFileOutput.stopRecording()
}
}
}
问题:有时开始播放音频会延迟一微秒。当视频录制中的音频开始播放和录音时,声音中有一定的时间同步和一定的时间延迟。
我检查它与原始音频合并音频和有一些延迟,如下图所示。问题并不总是随机延迟和不同步。
有什么解决方案吗?如何在录制视频和播放音频的同时(单击一次按钮)开始并且没有延迟和没有同步问题?还有别的办法吗?
播放所使用的音频: AVAudioPlayer
用于录制视频: Swiftycam (AVCaptureSession)
发布于 2017-05-23 11:33:00
有几件事你可以试试:
1)后台队列播放音频:
dispatch_async(dispatch_get_global_queue(QOS_CLASS_BACKGROUND, 0)) {
self.player.play()
}
2)将您在viewDidAppear
(包括prepareToPlay()
)中的代码移至viewDidLoad
。我认为这将是一个不太有用的建议,因为播放是由用户发起的,但在prepareToPlay()
和音频准备就绪之间存在延迟。
如果您尝试了这些方法,但延迟仍然太大,那么您可能只需要使用AVAudioPlayer
以外的其他工具,例如OpenAL
。
https://stackoverflow.com/questions/44040604
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