Unable to change the resolution of the camera without cropping the image

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I'm using bayer_rggb_image_proc.launch file in which I'm keeping the image_width and image_height to the maximum resolution of the camera. I want to downsample the resolution of the camera to the half so I set subsampling parameter to 2. However I'm getting the error of Failed to set Area Of Interest. I can successfully do the same with ueyedemo and getting the resolution I want. What could be the issue here?

I'm using this package http://wiki.ros.org/ueye_cam Under ROS-melodic