Stitch photos without reducing there size

I am using Hugin to stitch photos in realtime.
My flying drone sends me pictures with I stitch together and keep on repeating the process.
Problem I am facing is that Hugin resizes the final panorama which can not be further stitched.
I am using command line for components of Hugin instead of GUI
I think I have to make changes in command for NONA and ENBLEND but I do not know how and what format to follow
Help would be appreciated.