Screen is not be captured properly from Screen Recorders like QuickTime when Accessibility Zoom is active

Originator:ralf.ebert
Number:rdar://41439753 Date Originated:
Status:Open Resolved:
Product:macOS + SDK Product Version:10.13.4 (17E199)
Classification: Reproducible:
 
Summary:
Screen is not be captured properly from Screen Recorders like QuickTime when Accessibility Zoom is active

Steps to Reproduce:
- Enable a scroll gesture to zoom in Preferences » Accessibility » Zoom
- Start a screen recording from QuickTime using "File » Screen Recording"
- Use the scroll gesture during recording to zoom in

Expected Results:
It should record what is visible on the screen

Actual Results:
When zoom is active, the video has strange artifacts that make the recoding unusable (see attached example video)

Version:
10.13.4 (17E199)

Notes:
Also affects other screenrecording products like Telestream ScreenFlow as discussed here: https://telestreamforum.forumbee.com/t/k9k3dw/high-sierra-causes-zoom-video-bug-in-screenflow-7-and-6

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