media-ctl

I do not understand how to calculate the step of:

media-ctl -f '"mt9t001 3-005d":0 [SGRBG10 2048x1536 (32,20)/2048x1536], "OMAP3 ISP CCDC":2 [SGRBG10 2048x1536], \
              "OMAP3 ISP preview":1 [UYVY 2048x1536]'

and yavta convert to:

yavta -f UYVY -s 2030x1527 --capture=1 --file=image /dev/video4

How calculate from 2048x1536 to 2030x1527?