Capture frames from both cameras (TelePhoto and WideAngle) in the same time

Question

It's possible to get frame from TelephotoCamera, WideAngleCamera or automatically using DualCamera:

//auto
let device = AVCaptureDevice.default(.builtInDualCamera, for: .video, position: .back)
//telephoto
let device = AVCaptureDevice.default(.builtInTelephotoCamera, for: .video, position: .back)
//wideAngle
let device = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .back)

But how to get frames from TelephotoCamera and WideAngleCamera in the same time (using devices with dual cameras).

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Edit1
Tried to add 2 inputs to capture session:

captureSession?.addInput(input)
captureSession?.addInput(input2)

NSInvalidArgumentException: Multiple audio/video AVCaptureInputs are not currently supported

Edit2
Tried to enable isDualCameraDualPhotoDeliveryEnabled flag for capture photo output:

capturePhotoOutput?.isDualCameraDualPhotoDeliveryEnabled = true

NSInvalidArgumentException: Dual Camera dual photo delivery is not supported in this configuration

But
isDualCameraDualPhotoDeliverySupported gives false on iPhone 8 Plus
could it be the reason of my problem?

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Still no luck.

Answer 1

Yes, it's possible.
Just pick the right configuration.

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Capture device should be builtInDualCamera:

let captureDevice = AVCaptureDevice.default(.builtInDualCamera, for: .video, position: .back)

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Configure capture photo output after configuring capture session:

captureSession = AVCaptureSession()
captureSession?.sessionPreset = AVCaptureSession.Preset.photo
captureSession?.addInput(input)
captureSession?.addOutput(capturePhotoOutput!)

capturePhotoOutput?.isHighResolutionCaptureEnabled = true

capturePhotoOutput?.isDualCameraDualPhotoDeliveryEnabled = true

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Configure photo settings before capture the photo:

let photoSettings = AVCapturePhotoSettings()
photoSettings.isAutoStillImageStabilizationEnabled = true
photoSettings.isHighResolutionPhotoEnabled = true
photoSettings.isAutoDualCameraFusionEnabled = false

photoSettings.isDualCameraDualPhotoDeliveryEnabled = true

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Implement AVCapturePhotoCaptureDelegate, and override next method:

public func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?)

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You will receive 2 photoOutput callbacks!