FB21253535: Screen capture continues streaming stale frames when device locks

[samhenrigold]

Submission Date

2025-12-03

Status

Open

Area

Screen Recording

Operating System Version

iOS 26.2

Type

Incorrect/Unexpected Behavior

Description

When an iOS device is being captured via USB (QuickTime, etc.), locking the device or triggering certain system UI causes the capture stream to repeatedly deliver the last valid frame instead of indicating the interruption. There is no signal to the capturing application that live content is no longer available.

Steps to Reproduce:

1. Connect an iOS device to a Mac via USB
2. Open QuickTime Player > File > New Movie Recording
3. Select the iOS device as the camera source
4. Observe live preview working normally
5. Lock the iOS device

Expected Behavior:

Either:

• The preview should indicate the device is locked (black frame, placeholder image, or status message)
• The capture session should signal an interruption so the Mac application can respond appropriately

Actual Behavior: QuickTime (and all other apps using this feature) continues showing the last frame before the device locked. There is no visual indication that the content is stale. If recording, the recording continues capturing the frozen frame.

See also: FB21253528

Keywords

QuickTime, AVCaptureDevice, iOS screen capture, kCMIOHardwarePropertyAllowScreenCaptureDevices

Prerequisites

• [x] The title follows the format FB<number>: <title>
• [x] I will keep this issue updated with Apple's responses