Wrong aspect ratio for initial video recording on on iPhone 12

On an iPhone 12 in portrait mode, I've found that my app's first video recording will be the wrong aspect ratio.

Here's a still from the first video in the app:

The video is 1440 × 1920

And here's the second video recorded in the app:

This video is 664 × 1440 (which is the correct size)

As far as I can tell, the view is identical in both cases

Here's my RecordAR configuration:

private var recorder: RecordAR?

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    let recorder = RecordAR(ARSceneKit: sceneView)!
    recorder.videoOrientation = .alwaysPortrait
    recorder.contentMode = .viewAspectRatio
    recorder.enableAudio = false
    recorder.inputViewOrientations = [.portrait]
    recorder.requestMicPermission = .manual
    recorder.prepare(self.configuration)

    self.recorder = recorder
}

I've tried various other settings for content mode, but none seem to fix the first recording.

Workaround

As a workaround, I currently create a fake recording before triggering the real recording:

    // The aspect ratio gets messed up on the first recording, so trigger
    // a fake recording to fix it
    Timer.scheduledTimer(withTimeInterval: 1, repeats: false, block: { _ in
        recorder.record(forDuration: 0.5) { _ in
            recorder.enableAudio = true
        }
    })

Not sure if there's a better way to do this

AFathi / ARVideoKit

Wrong aspect ratio for initial video recording on on iPhone 12 #124

Workaround