Question / Help OBS Preview in 1080p but stream in 720p?

[Kyle Cross]

I play my games through the OBS preview, my capture card the ExtremeCap U3 from AverMedia allows me to do this without any noticable latency, I do this because it allows me to put my Twitch chat as an overlay over the game and play it on the same screen without the need for a second monitor. The issue I'm having now tho is changing the resolution and framerate I stream at caps the preview to the same.

So if I want to play 1080p 60fps in the preview then I have to set to stream also at 1080p 60fps. I was wondering if there is anyway I can make it so the preview isn't effected by my streaming resolution and framerate. I want to be able to keep the preview screen, which is what I play from, in 1080p 60fps but actually stream at say 720p.

 

[Kyle Cross]

So I did a screenshot test, screenshotted one image native 1080p fullscreen on my 1080p monitor and another of the 720p downscale fullscreen on my 1080p monitor, put them over eachother in photoshop and zoomed in. There's actually no difference in detail between the two so now I'm no longer concerned about this.

I am still curious if there is a way to stream in 30fps but keep the OBS preview in 60fps tho.