no video only audio

For the assumption that you get audio without video after the export the disabling of the hardware encoder is done like this:
NeNecRnGzZ
Make sure you also have parallel processing disabled.

If you do not see the video in the preview before export, you may need to change the display method.
This can be found in the menu -Preferences-Display Method (there are several options: automatic-OpenGL-DirectX(Angle)-Software(MESA)