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Plug in your HDMI dummy plug into a spare HDMI port (You might need an extra dongle for this one.).The command below should do the same thing, although your milage may vary:
It also prevents apps from opening on second "display".
Camera spoofing camtwist 1080p#
This removes the menu bar on the dummy display, so that we can extract the native 1080p video that is getting streamed to it without any unwanted visual artifacts. You will need to log out, then log back in again. Go to System Preferences, select Mission Control, then uncheck Displays have separate Spaces. While the settings below allow earlier versions of OBS to display fulscreen video without artifacts, the opposite is true with newer versions. Update: As of OBS Studio 25.0.7, the OBS "Fullscreen Projector" now enters fullscreen mode differently than earlier versions.
When prompted with "Trust This Computer?", select "Trust" (This is what allows the screen to be shared natively via USB with macOS.). Connect your iPhone to your Mac via USB. Download and install Camera for OBS Studio. macOS: Download and install CamTwist Studio. macOS: Download and install iOS Camera plugin for OBS Studio. iOS: Download and install Camera for OBS Studio: $21.99. Hardware: Purchase and install an HDMI dummy connector: ~$10.99 (Fast delivery despite COVID-19!). 4K), and you won't have issues with notifications or extra artifacts in your feed. What does that mean? It'll chew up way more resources, but you have options for much higher resolution video (i.e. This is just-as-if-not-more-so janky as the previous method, but it relies on a video stream overe USB from the iPhone rather than screen sharing, which is then processed by some real broadcast software.