Fortnite OBS FPS Drops 20Fps approx?

Good day eig has a relatively good PC and a 50k line.

GTX 970

MSI Z290 Gaming Pro

Bequiet power supply… 50k line telecom now I'm in the question Ingame I have enough FPS or if I play without OBS but as soon as I open the drop and drop it in the stream it even lies, even though in OBS 60 Fps are set and both coders have tried NVEH as well as CPU. Who had the same problem? In addition, even if I have OBS open and Fortnite ingame 60 pictures the seconds set obs small piece of liquid but in the game hell the picture flickers easily and does not feel fluid.

It's probably due to your processor what do you have for one?