this post was submitted on 02 Jul 2025
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Well in that log, it actually DOES use the right GPU. There are some other errors you have going on in there though, like you seem to have AV1 encoding selected somewhere in your settings, but this RTX 3070 doesn't support AV1 encoding (on the fly) AFAIK.
Try launching the app this same, setting all your hardware encoding stuff back to defaults, then see if you can get it working. In these logs it IS picking up the second pipewire display, so that's good, but launch this way again without AV1 enabled then upload the logs again and let's see what's happening.
I dont think i ever set AV1 encoding inside OBS, looking at my settings, it just shows h.264:

To add RTX 30XX series doesn't support AV1 encode, only decode, so any AV1 encoding would have to be done on the CPU (better to use h.264 or HEVC for hardware encode in OBS)