Video and Image Processing Scaler II IP Question

Hi there,

I am wondering, when inputting a video stream with a resolution of 1920 x 1080p to the scaler II IP core and scaling this video down to 1280 x 800p, do I always need to then output this video stream from the scaler into a framebuffer before I input this video stream into a Clocked Video Output IP core? It seems like my CVO underflow continues to trigger no matter how large I make the input FIFO of the CVO.

My scaler runs at 100 MHz and my CVO outputs video at 65 MHz.

Thank you!