ffmpeg -i "C:\Users\Kenny\My
   PhotoFilmStrips\Unnamekens_brain-lenses\FULL-HD\output.avi" -i
   "C:\Users\Kenny\My
   PhotoFilmStrips\Unnamekens_brain-lenses\Medium\output.avi"
   -filter_complex "[0:0][1:0]overlay=format=rgb[out]" -shortest
   -map [out] -vcodec kensbrain.avi