Question / Help Constrain stream source to 1920*1080

[Muskoka Iracing]

I've been away from OBS for long enough to have forgotten a few things...
I run triple monitors @ 5760*1080
I just want to stream the center one @ 1920*1080. I have forgotten where it is that you set the size of the source window to that resolution. Currently the Selection box encompasses the entire source (5760*1080)
Where do I do this...?

 

[MrFreeze]

Can you make sure it is unlocked and Right click the preview and drag it to the size you want?

 

[Muskoka Iracing]

Its unlocked.
When I resize the Preview side it resizes everything so the output (Program) ends up letterboxed. I think the output is the correct size, at least it looks that ay in the Program window. I just dont want OBS looking at the whole 3 screens if that is going to consume system resources unnessicarily.

 

[MrFreeze]

Obs Should only see the source you set up. So if you have your center screen set up as a game capture, or display capture, or whatever that should be all that OBS will see..

 

[Muskoka Iracing]

The only source is the composite of the 3 screens - Nvidia Surround makes them all behave as 1 large monitor. Maybe its working properly...like I said i just dont want to be capturing all 3 screens when the output is only 1.

 

[Narcogen]

If Nvidia surround makes them look to the system like one display, then that's what OBS will capture.

You can crop/size it to fit a smaller canvas; I'm honestly not sure if content outside the canvas is rendered or not. It might be.

 

[carlmmii]

As Narcogen said, OBS can only capture the display resolution that your current monitor environment exists in. Because you have your monitors set up with Nvidia surround, that means that the entire 5760x1080 area is going to be captured.

As far as whether stuff outside the canvas is rendered or not, it's honestly a moot point -- the entirety of the display capture has to reside in VRAM regardless of what happens with it for the composite. Past that point, performance shouldn't be impacted when it comes to the canvas compositing, since that's only going to be working with the 1920x1080 area of the canvas for pixel operations (and even if the entire 5760x1080 area is scaled down, that's a cheap action that is performed before any compositing happens).

tl;dr, don't worry about the performance impact too much. Just crop your display capture down to the middle 1920x1080 area. You can do this either by adding a crop/pad filter to your source, or you can hold alt while you drag the bounding box to crop in, or you can adjust the crop values manually by going to the Edit Transform menu.