You can use 4K video capture cards to bring 4K video signals into Livestream Studio.
Important: While you can record and output in 4K, you can only stream in 4K if you are able to enable hardware encoding.
In settings, under the Project Format menu, there is a Definition section.
Selecting Ultra HD will allow you to choose a 4K format as your Project Format. This means that you can use 4K cameras with supported 4K capture cards to bring in 4K video signals.
Any camera sources that are not in 4K can be converted under the Input Settings tab. Please note that using the converter may increase your CPU consumption.