AVCaptureSession录制带有音频的视频

Question

我已经设置了我的应用程序，使用AVCaptureSession从摄像头记录视频，但是没有音频。如何记录音频并将其添加到文件的videoOutput中？以下是我记录视频的代码：

AVCaptureSession *session = [[AVCaptureSession alloc] init];
[session beginConfiguration];
session.sessionPreset = AVCaptureSessionPresetMedium;

CALayer *viewLayer = self.vImagePreview.layer;
NSLog(@"viewLayer = %@", viewLayer);

AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
captureVideoPreviewLayer.frame = self.vImagePreview.bounds;

[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer];

AVCaptureDevice *device = [self frontFacingCameraIfAvailable];

NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if (!input) {
    // Handle the error appropriately.
    NSLog(@"ERROR: trying to open camera: %@", error);
}

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [paths objectAtIndex:0];

AVCaptureMovieFileOutput *movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];

NSString *archives = [documentsDirectoryPath stringByAppendingPathComponent:@"archives"];
NSString *outputpathofmovie = [[archives stringByAppendingPathComponent:@"Test"] stringByAppendingString:@".mp4"];
NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputpathofmovie];

[session addInput:input];
[session addOutput:movieFileOutput];
[session commitConfiguration];
[session startRunning];
[movieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self];

我添加了另一个用于音频的输入，但它无法与后台的mpmovieplayercontroller一起使用。有没有什么想法可以播放一个视频并同时录制来自相机的音频和视频？

- user717452

---

@MDT 那我应该怎么办呢？如果你要花时间发布一个链接，为什么不把它变成你认为会对我有帮助的链接呢？ - user717452

请将以下与编程相关的内容从英文翻译成中文。只返回翻译后的文本：请参见添加的最后一段以进行编辑 - user717452

Answer 1

您没有包括音频设备：

AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
AVCaptureDeviceInput * audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:nil];
[session addInput:audioInput]

在beginConfiguration和commitConfiguration之间。它会起作用！！！

- user1249876

---

由于某种原因，当我添加AudioInput并开始录制时，预览会冻结，视频输出文件会持续报告0秒的录制镜头...一旦我注释掉音频输出，它就会再次开始工作:( - Moonwalker

Answer 2

在beginConfiguration()和commitConfiguration()之间添加以下代码。

// Add audio device to the recording

let audioDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeAudio)
do {
    let audioInput = try AVCaptureDeviceInput(device: audioDevice)
    self.captureSession.addInput(audioInput)
} catch {
    print("Unable to add audio device to the recording.")
}

- Abdul Yasin

---

问题是关于 Objective-C 而不是 Swift。 - NSNoob

Answer 3

在 Swift 5x 中，您可以使用以下代码：

do {
        guard let audioDevice = AVCaptureDevice.default(for: AVMediaType.audio) else {
            print("Default audio device is unavailable.")
            setupResult = .configurationFailed
            session.commitConfiguration()
            return
        }

        // Add audio input
        let audioInput = try AVCaptureDeviceInput(device: audioDevice)
        if session.canAddInput(audioInput) {
            session.addInput(audioInput)
        } else {
            print("Couldn't add audio device input to the session.")
            setupResult = .configurationFailed
            session.commitConfiguration()
            return
        }

    } catch {
        print("Couldn't create Audio device input: \(error)")
        setupResult = .configurationFailed
        session.commitConfiguration()
        return
    }

- Mohsen mokhtari