Capture output glitch on iPhone 8 Plus in DualCamera mode + 4K Video + AVCaptureVideoDataOutput + stabilization

Number:rdar://34939580 Date Originated:October 11 2017,
Status:Open Resolved:
Product:AVFoundation Product Version:iPhone 8 Plus
Classification: Reproducible:Always

Camera capture output displays a glitched view on the iPhone 8 Plus when using AVCaptureVideoDataOutput to capture video, along with the DualCamera device type, recording in 4K Video and having video stabilization on.

Steps to Reproduce:
1. In sample app RosyWriter (I used RosyWriterCIFilter), set the following settings:
     + AVCaptureDevice should be AVCaptureDeviceTypeBuiltInDualCamera
     + Stabilization: AVCaptureVideoStabilizationModeAuto
     + Session preset: AVCaptureSessionPreset3840x2160
2. Run the project on an iPhone 8 Plus

Expected Results:
Regular video capture is displayed

Actual Results:
The capture output is appearing as a small chunk of the video being duplicated throughout the display. (see screenshot)

iPhone 8 Plus on iOS 11.0, 11.0.1, 11.0.2, 11.0.3
Happens in apps built in Xcode 8.x and 9.x


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