What is StreamEngine? Should I install that on my computer for streaming?

We would recommend installing the StreamEngine if you are using the 3rd party software such as OBS or StreamLabs OBS for streaming. Once you installed the StreamEngine you will have an alternative options LGP2 and StreamEngine LGP2 in 3rd party software when you adding the capture device GC513 as a capture device. You can select the StreamEngine instead of the LGP2 since the StreamEngine is a hardware encoding compression that will help you lower your CPU of use and making your computer more sufficient.