此代码生成一个缺少音频的本地mp4文件。 如果我在quicktime播放器检查器中查看此文件，它具有H264格式但没有AAC音频。 如果我在应用程序中播放文件，则没有声音。
最奇怪的是，我可以将同一个文件作为多部分文档上传到服务器，并且没问题。我可以从服务器下载文件，它有AAC音频数据。
class VideoViewController: UIViewController, AVCaptureFileOutputRecordingDelegate
{
var captureDevice : AVCaptureDevice! // check capture device availability
var videoInput:AVCaptureDeviceInput?
let captureSession = AVCaptureSession() // to create capture session
var previewLayer : AVCaptureVideoPreviewLayer? // to add video inside container
var videoFileOutput:AVCaptureMovieFileOutput!
var audioDevice:AVCaptureDevice?
var audioInput:AVCaptureDeviceInput?
var playerController = AVPlayerViewController()
@IBOutlet weak var videoView: UIView!
override func viewDidLoad()
{
super.viewDidLoad()
}
override func viewDidDisappear(_ animated: Bool)
{
shutDown()
}
func isVideoSetup() -> Bool
{
if(captureDevice == nil)
{
return false
}
return true
}
func setupCamera()
{
print("setupCamera")
audioDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeAudio)
print("Audio capture device found")
//Do any additional setup after loading the view, typically from a nib.
// you have 3 option High quality recording, Medium quality recording and Low quality recording
captureSession.sessionPreset = AVCaptureSessionPresetLow
let deviceDescoverySession = AVCaptureDeviceDiscoverySession.init(deviceTypes: [AVCaptureDeviceType.builtInWideAngleCamera], mediaType: AVMediaTypeVideo, position: AVCaptureDevicePosition.front)
if(deviceDescoverySession != nil)
{
for device in deviceDescoverySession!.devices
{
if device.position == AVCaptureDevicePosition.front
{
print("Video capture device found")
captureDevice = device
setupCamera2()
return
}
}
}
print("Capture device not found")
fatalError(errorMsg:"Camera was not found.")
}
//Configuring & Initializing the camera
func setupCamera2()
{
print("setupCamera2")
do {
audioInput = try AVCaptureDeviceInput(device: audioDevice)
print("audio input created")
} catch {
print("Unable to add audio device to the recording.")
fatalError(errorMsg:"Unable to access audio device.")
return
}
if let device = captureDevice {
do{
try device.lockForConfiguration()
}catch{
print("error")
}
}
let err : NSError? = nil
do{
videoInput = try AVCaptureDeviceInput(device: captureDevice)
captureSession.addInput(videoInput)
}catch
{
print("error")
fatalError(errorMsg:"Unknown error.")
return
}
if err != nil
{
print("error: \(String(describing: err?.localizedDescription))")
fatalError(errorMsg:String(describing: err?.localizedDescription))
return
}
self.captureSession.addInput(audioInput)
print("added audio device")
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
// thumbnail is a ui container, your camera shows inside this container
previewLayer?.frame = videoView.layer.bounds
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspect
videoView.layer.addSublayer(previewLayer!)
captureSession.startRunning()
captureDevice?.unlockForConfiguration()
}
func startRecording()
{
if(captureSession.outputs.count > 0)
//if(captureSession.canAddOutput(videoFileOutput))
{
print("Resetting inputs")
captureSession.removeInput(audioInput)
captureSession.removeInput(videoInput)
captureSession.removeOutput(videoFileOutput)
setupCamera2()
}
videoFileOutput = AVCaptureMovieFileOutput()
videoFileOutput.movieFragmentInterval = CMTime(seconds: 1, preferredTimescale: 30)
captureSession.addOutput(videoFileOutput)
do
{
try FileManager.default.removeItem(at: dataMgr.videoFileURL)
}
catch
{
}
let recordingDelegate:AVCaptureFileOutputRecordingDelegate? = self
videoFileOutput.startRecording(toOutputFileURL: dataMgr.videoFileURL, recordingDelegate: recordingDelegate)
}
func stopRecording()
{
//To end recording just call this function
videoFileOutput.stopRecording()
}
func shutDown()
{
if(captureSession.outputs.count > 0)
{
captureSession.removeInput(audioInput)
captureSession.removeInput(videoInput)
captureSession.removeOutput(videoFileOutput)
}
captureSession.stopRunning()
}
func playVideo()
{
let item = AVPlayerItem(url: dataMgr.videoFileURL)
let player = AVPlayer(playerItem: item)
playerController = AVPlayerViewController()
playerController.player = player
playerController.view.frame = CGRect(x:videoView.frame.origin.x, y:videoView.frame.origin.y, width: videoView.frame.width, height: videoView.frame.height)
self.addChildViewController(playerController)
videoView.addSubview(playerController.view)
}
func stopPlaying()
{
//playerController.view.removeSubviews()
playerController.removeFromParentViewController()
videoView.removeSubviews()
utils.removeAllSubviews(vw: videoView)
}
@available(iOS 4.0, *)
public func capture(_ captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAt outputFileURL: URL!, fromConnections connections: [Any]!, error: Error!)
{
print("capture did finish")
print(captureOutput);
print(outputFileURL);
print("size of file=" + String(utils.getFileSize(fileURL: outputFileURL)))
}
func fatalError(errorMsg:String)
{
let alert = UIAlertController(title: "Error", message: errorMsg, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { action in
app.switchScreens(newscreen:"StartViewController")
}))
self.present(alert, animated: true, completion: nil)
}
}
答案 0 :(得分：1)
这很疯狂，但我通过更改我保存的文件名来解决这个问题
function Rice(){
if(document.getElementById("Rice").style.display == "none"){
document.getElementById("Rice").style.display = "block";
}else{
document.getElementById("Rice").style.display = "none";
}
}
function boiledRice(){
if(document.getElementById("boiledRice").style.display == "none"){
document.getElementById("boiledRice").style.display = "block";
}else{
document.getElementById("boiledRice").style.display = "none";
}
}
function friedRice(){
if(document.getElementById("friedRice").style.display == "none"){
document.getElementById("friedRice").style.display = "block";
}else{
document.getElementById("friedRice").style.display = "none";
}
}到
<div class="media-right">
<table class="table">
<tr>
<td>
<a onclick="Rice()"><h3 class="menu-title">Rice</h3></a><div id="Rice" style="display:none;"><ul><li>1</li><li>2</li><li>3</li></ul></div></td> <!--make this tr expandable and collapsable-->
<td>
<div class="menu-rate">$100.00</div>
</td>
</tr>
<tr>
<td>
<a onclick="friedRice()"><h3 class="menu-title">Fried Rice</h3></a><div id="friedRice" style="display:none;"><ul><li>1</li><li>2</li><li>3</li></ul></div></td>
<td>
<div class="menu-rate">$50.00</div>
</td>
</tr>
<tr>
<td>
<a onclick="boiledRice()"><h3 class="menu-title">Boiled Rice</h3></a><div id="boiledRice" style="display:none;"><ul><li>1</li><li>2</li><li>3</li></ul></div></td>
<td>
<div class="menu-rate">$25.00</div>
</td>
</tr>
</table>
</div>