OBS limited to maximum 8 full screen projector?

tomtomt

tomtomt

New Member
Hi, is there a limit to the amount of full screen projector? I have a computer with 12 external monitors connected, and I want to project individual scenes to each monitor, but no matter how I tried, only the maximum 8 full screen projectors are assigned, I notice that if I assign the ninth full screen, it will replace the last created one in the taskbar.

After googling it, no one mentioned any constraints about the amount of the projection. So what is the problem?
 
Suslik V said:
OBS has hardcoded limit of 10 fullscreen projectors (internal counter from 0 to 9):
github.com

obs-studio/frontend/widgets/OBSBasic_Projectors.cpp at 63206664e02f084e45aa248c01dff21dedb5a3a2 · obsproject/obs-studio

OBS Studio - Free and open source software for live streaming and screen recording - obsproject/obs-studio
github.com github.com

Possible workaround - windowed projector can be maximized.
Click to expand...
One year later, I just still on this matter. I managed to get hold of the OBS source code and alter the maximum full screen number, It does produce 12 full screen projectors as I want, however, the windows are blank, it seems like it reaches the limitation of handle cross-adapter resource sharing, is there any workaround to achieve this? I want my OBS to produce full projections on each of my 12 external monitors, my computer is equipped with 3 x gpu each has 4 HDMI output.
 
That could be a VRAM issue. Also with three GPUs, they likely aren’t all running at x16 which is gonna nerf your performance vastly.

Use GPU Z and post what it’s saying about each GPU.

Also from personal experience, running OBS on a multi GPU set up creates a lot of troubleshooting you’ll have to do. I’ve been struggling to clean up my stream since I added a second GPU specifically for more monitors.

Additionally how many display ports are on your GPU? Those are easier to split into different monitors without adding a GPU.
 
You can typically run four monitors off an MST hub via one display ports are. As long as they are 1080p or lower. With sufficient display ports, that may could help your issue some. The multiple GPUs is very likely to be causing an issue of some kind as OBS doesnt really like running those types of setups.
 
This behavior:
tomtomt said:
...only the maximum 8 full screen projectors are assigned, I notice that if I assign the ninth full screen, it will replace the last created one in the taskbar
Click to expand...
is strange. No need to modify OBS code to test it. Probably, someone of the developers can try Virtual Display Driver to setup 12 devices and see if this problem reproducible.

At least, 10 devices should work OK. Thus, I think, you may report this problem to: https://github.com/obsproject/obs-studio/issues
Edit: don't forget to add step-by-step instructions and maybe video of the setup process (if possible).
 
tomtomt said:
Hi, is there a limit to the amount of full screen projector? I have a computer with 12 external monitors connected, and I want to project individual scenes to each monitor, but no matter how I tried, only the maximum 8 full screen projectors are assigned, I notice that if I assign the ninth full screen, it will replace the last created one in the taskbar.

After googling it, no one mentioned any constraints about the amount of the projection. So what is the problem?
Click to expand...
That's a bit strange. My first guess would be some software limit rather than your hardware. Have you tried an older or newer version to see if it behaves the same way?
 
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