Any game that you want to capture with LIV/Streamerkit has to be running in OpenVR. If you are using an Oculus Rift, Oculus Rift S, or an Oculus Quest + Link/Virtual Desktop combo, you will need to force the game you're trying to use into OpenVR mode.
For 99% of cases, this is very easy and all you need to do is add
"-vrmode openvr" to the game's launch options on Steam, as shown in the video below.
Unreal Engine games
- Right click the game in your Steam library
- Open properties
- Type in the LAUNCH OPTIONS -hmd=SteamVR
Games owned on the Oculus Rift Store are not supported and won't work with LIV.