Dual 64MP USB 3 UVC Camera's can't take 64mp images (9248x6944)

as it currently stands it is not possible to capture images with two 64MP RGB888 simultanneously dude some sort of libcamera memory allocation issue that arducam is actively trying to work out with libcamera people. What you can do is make 1-2 sec delay between two cameras at 64MP or use YUV420 encoding instead of RGB888 at 64MP or decrease resolution to 48MP.

Solution and my full thread here on the same topic: