Peter Hanzel

This assert means that it cannot allocate enough memory for display buffer. What is the resolution of display you want to show? And what RPI model is it? Some other...

Hello. Could you please add first lines of output when program is run. When it is something like Display size is 4 x 46446656 I saw this on some firmware...

Added -d option to specify dispmanx display ID. Headless I use 0, but 3 can be tried. Please pull and recompile if you wish.

Hello. I think this is related to vc4-kms-v3d. I also use raspi-config and use vc4-fkms-v3d driver.

try ldconfig and then ldconfig -p | grep vncserver