No sound if video is more then 12 seconds

Question

I create a custom vido recording app, using AVFoundation. problem is when recording reaches 13 seconds length the sound disappears from result video entirely. I set up camera with is code:

private func configure(_ mode: CameraMode) {
    guard let devices = AVCaptureDevice.devices(withMediaType: AVMediaTypeVideo) as? [AVCaptureDevice] else {return}
    for device in devices {
        if device.position == .back {
            do {
                let input = try AVCaptureDeviceInput(device: device)
                if session.canAddInput(input) {
                    session.addInput(input)
                }
                configureVideoOutput(for: device)
                session.startRunning()
            } catch (let error) {
                print(error)
            }
        }
    }

}


private func configureVideoOutput(for device: AVCaptureDevice) {
    if device.hasMediaType(AVMediaTypeVideo) && session.canAddOutput(sessionVideoOutput) {
        session.beginConfiguration()
        session.sessionPreset = AVCaptureSessionPresetHigh
        guard let devices = AVCaptureDevice.devices(withMediaType: AVMediaTypeAudio) as? [AVCaptureDevice] else {return}
        for device in devices {
            do {
                currentDevice = device
                let input = try AVCaptureDeviceInput(device: device)
                if session.canAddInput(input) {
                    session.addInput(input)
                    break
                }
            } catch (let error) {
                print(error)
                session.commitConfiguration()
            }
        }
        session.addOutput(sessionVideoOutput)
        session.commitConfiguration()
    }
}

and star recording video with this code:

 @objc private func takeVideo(_ gesture: UILongPressGestureRecognizer) {
    switch gesture.state {
    case .began:
        print("begin take video")
        configure(.video)
        if let _ = sessionVideoOutput.connection(withMediaType: AVMediaTypeAudio) {
            let fileName = "mysavefile.mp4";
            let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
            let filePath = documentsURL.appendingPathComponent(fileName)
            sessionVideoOutput.startRecording(toOutputFileURL: filePath, recordingDelegate: self)
            setCaptureButtonToVideoMode(on: true)
        }
    case .ended, .cancelled:
        print("end take video")
        sessionVideoOutput.stopRecording()
        setCaptureButtonToVideoMode(on: false)
    default:
        break
    }
}

at the end i save video to camera roll:

func capture(_ captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAt outputFileURL: URL!, fromConnections connections: [Any]!, error: Error!) {
    print("capture did finish")
    print(captureOutput)
    print(outputFileURL)
    PHPhotoLibrary.shared().performChanges({
        PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: outputFileURL)
    }) { saved, error in
    }
}

if video is smaller then 13 seconds everything works as expected.

score 5 · Accepted Answer · answered Mar 20 '17 at 17:00

5

When i am recording a movie I use VCaptureMovieFileOutput() as session output and it has property called movieFragmentInterval that is set to 10 seconds by default. Changing this property to kCMTimeInvalid fixed the problem.

answered Mar 20 '17 at 17:00

Evgeny Mitko

245
2
12

thanks bro you save my day. – Gurinder Batth Oct 30 '17 at 12:42
thanks a lot, bro I am facing this issue for more than a week. – bhavik Mar 30 '22 at 08:32
private lazy var movieFileOutput: AVCaptureMovieFileOutput = { let output = AVCaptureMovieFileOutput() output.movieFragmentInterval = .invalid return output }() – Naloiko Eugene Mar 13 '23 at 14:03

No sound if video is more then 12 seconds

1 Answers1