If you are using Livestream Studio on macOS Mojave, we recommend checking your Security & Privacy settings to ensure that Studio can run and all your video and audio sources are properly recognized.
In System Preferences, navigate to Security & Privacy. Select the Privacy tab in the window that opens.
There are three permissions you will need to ensure has Livestream Studio enabled: Camera, Microphone, and Accessibility. Highlight each of these and make sure Livestream Studio is checked.
These permission settings do not apply to earlier versions of macOS.