There may be compatibility issues with OBS game capture and Witcher 3, where the game immediately exits when trying to capture it. I have made a small update to game capture to try and resolve this problem, but it needs testing. You can download the test build from https://r-1.ch/GraphicsCaptureHook64.zip
Extract the .DLL file to your C:\Program Files (x86)\OBS\plugins\GraphicsCapture folder, replacing the old file. If you use the 64 bit version of OBS, the .DLL needs to go to C:\Program Files\OBS\plugins\GraphicsCapture instead.
When running OBS with this test file, it will ask you to update since the game capture DLL no longer matches the latest published version. Decline the update prompt or you will revert to the old file.
Please provide feedback in this thread as to whether this worked or not, including where your copy of Witcher 3 was purchased from and what GPU you are using.
Extract the .DLL file to your C:\Program Files (x86)\OBS\plugins\GraphicsCapture folder, replacing the old file. If you use the 64 bit version of OBS, the .DLL needs to go to C:\Program Files\OBS\plugins\GraphicsCapture instead.
When running OBS with this test file, it will ask you to update since the game capture DLL no longer matches the latest published version. Decline the update prompt or you will revert to the old file.
Please provide feedback in this thread as to whether this worked or not, including where your copy of Witcher 3 was purchased from and what GPU you are using.