STM32N6570-DK with STEVAL-66GYMAI Flickering problem

[FB__1]

Hello,

I am using this example: https://github.com/STMicroelectronics/x-cube-n6-ai-h264-usb-uvc

HW: STM32N6570-DK + STEVAL-66GYMAI 

I have this strange behavior only when using the VD66GY. If no motion on the video, i barely see the flickering. However, when i do a little motion in front of the camera, I begin to see white horizontal lines on the  of the video stream, this flickering happens only at around 30fps. Only when I reduce to 15fps it disappears...

Also lowering the VENC resolution did not fix it. 

#define VENC_VD66GY_WIDTH

#define VENC_VD66GY_HEIGHT

BTW, The IMX335 works fine at 30fps.

Can someone help me ?

Thank you.

[FB__1]

I think it may be related to the external PSRAM.
Any idea how to fix it ?