Some devices could be connected to your mac but you can't see any picture from it or even get an errors, using standard apps. This app helps you to see and record video from many thermal imagers that shares video to you mac using non-standard formats. You can also use this app for different astronomical cameras and even for built-in FaceTime camera. You can record to H.264, HEVC and ProRes. XCapture will try to select best format for your device, but you can manually select another one, and use those you need.

Who needs this app: those who connect device and the system recognises it as UVC Camera but QuickTime can't show any picture from it or even shows an errors. Or in some cases it could be "broken" picture with noise. This tells us that device works but you need to choose correct format of picture from it - thats what XCapture does!