Why AVCaptureSession output a wrong orientation?

user_397717 0
Viewed 60154

So, I followed Apple's instructions to capture video session using AVCaptureSession: http://developer.apple.com/iphone/library/qa/qa2010/qa1702.html. One problem I'm facing is that even though the orientation of the camera / iPhone device is vertical (and the AVCaptureVideoPreviewLayer shows a vertical camera stream), the output image seems to be in the landscape mode. I checked the width and height of imageBuffer inside imageFromSampleBuffer: of the sample code, and I got 640px and 480px respectively. Does anyone know why this's the case?

Thanks!

avcapturedevice avcapturesession iphone
11 Answers

First of all, in the configuration of your video output, put these lines:

guard let connection = videoOutput.connection(withMediaType: 
AVFoundation.AVMediaTypeVideo) else { return }
guard connection.isVideoOrientationSupported else { return }
guard connection.isVideoMirroringSupported else { return }
connection.videoOrientation = .portrait
connection.isVideoMirrored = position == .front

Then, configure your Target to support just Portait, by unchecking Landscape modes in General configuration.

(Source)

user_79691930 
// #1
AVCaptureVideoOrientation newOrientation = AVCaptureVideoOrientationLandscapeRight;
if (@available(iOS 13.0, *)) {
    // #2
    for (AVCaptureConnection *connection in [captureSession connections]) {
        if ([connection isVideoOrientationSupported]) {
            connection.videoOrientation = newOrientation;
            break;
        }
    } // #3
} else if ([previewLayer.connection isVideoOrientationSupported]) {
    previewLayer.connection.videoOrientation = newOrientation;
}

Once that you can correctly use your AVCaptureSession, you can set a video orientation. Here a detailed description of the code above. Remember, this code has to be executed after the [captureSession startRunning] execution:

  1. Choose the orientation that you prefer
  2. For ios version >= 13.0 you have to retrieve the active connection from the captureSession. Remember: only video connection supports videoOrientation
  3. For ios version < 13.0 you can use the connection from the previewLayer

If your viewController doesn't have a fixed orientation you can set a new videoOrientation to your connection once the device orientation changes.

user_38963540

You can try this:

private func startLiveVideo() {

    let captureSession = AVCaptureSession()
    captureSession.sessionPreset = .photo
    let captureDevice = AVCaptureDevice.default(for: .video)

    let input = try! AVCaptureDeviceInput(device: captureDevice!)
    let output = AVCaptureVideoDataOutput()
    captureSession.addInput(input)
    captureSession.addOutput(output)

    output.setSampleBufferDelegate(self, queue: DispatchQueue(label: "videoQueue"))
    output.connection(with: .video)?.videoOrientation = .portrait

    let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
    previewLayer.frame = view.bounds
    view.layer.addSublayer(previewLayer)

    captureSession.startRunning()
}
user_26564470
Related