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For what it's worth, the NDIHX software works well on iPhone and Mac through OBS, and is at least available on Windows.

I'd like Macs to have an official loopback device so video effects wouldn't have to be implemented in every program separately. For example an overlay that worked in Facetime/Zoom/Teams/etc.

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Isn't that sort of how SnapCamera and the like work today? You give the physical camera to Snap, which does the video processing and then creates a virtual camera device that you can select as your camera in in zoom. It's not exactly as you describe (and FaceTime doesn't respect/offer it), but Zoom doesn't have to implement the effects and can use the device still.

Yes, but it's fragile. Zoom has disabled whatever permission is needed for a virtual camera in the past, and I think Skype requires modifying the binary to enable it. The OBS virtual camera seems to work well now, but that's a recent change and I'm not sure I trust it to keep working on new versions of macos.

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