iPhone capture session: Set custom frame-rate

I've set up a captureSession and am now trying to set the framerate to 60. I am using an iPhone 12 Pro Max.

I am trying to set the frame rate with:

videoDevice?.activeVideoMinFrameDuration = CMTimeMake(value: 1, timescale: 60)

However, printing my .activeFormat tells me my iPhone only supports 30 fps.

I need 60 fps to match the frame rate of my machine learning model.

Configuration:

• builtinwideanglecamera,
• video,
• back position,
• landscape right orientation.

I do not have any cameras in this enum that allow me more than 30 fps. I create the videoDevice object therefore with:

let videoDevice = AVCaptureDevice.default(.builtInWideAngleCamera,                                           
                                          for: .video,
                                          position: .back)

What am I doing wrong?

Thanks

Thanks, this answered my question!:)

For anyone still wondering below is the code that I used:

    // Instantiate the video device: wide angle camera, back position
    let videoDevice = AVCaptureDevice.default(.builtInWideAngleCamera,
                                              for: .video,
                                              position: .back)
    
    
    // Set the frame rate to 60, as expected by the model
    try! videoDevice?.lockForConfiguration()
    
    videoDevice?.activeFormat = (videoDevice?.formats[30])!
    videoDevice?.activeVideoMinFrameDuration = CMTimeMake(value: 1, timescale: 60)
    videoDevice?.activeVideoMaxFrameDuration = CMTimeMake(value: 1, timescale: 60)
    
    videoDevice?.unlockForConfiguration()

    // Debug only
    // print(videoDevice?.activeFormat)

However, make sure to add some error handling:D

Thanks, again.