itch.io

It really depend on your graphic card. 6K is a lot, I'm not sure if it will work. Maybe in the new "Lite" version, but I can't be sure of it.

From my testing with VR videos, the Nvidia RTX 3080 (10GB VRAM) can barely handle 5K (ex. around 5100x2550). Anything higher crashes due to running out of VRAM. Note that I had to set Data Precision to Above Normal. Data Precision Normal led to unacceptable artifacts.

I tried the "save memory" option but it didn't seem to help much.