# optional cropping 100px off bottom
if [ "$1" == "cropit" ]; then
   ITS_CROP_TIME=
   mkdir cropped; for i in *.mp4; do ffmpeg -i "$i" -filter:v "crop=1920:980:0:-100" cropped/"${i%.*}.mp4"
   rm -r *.mp4
   cd cropped
   cp -r *.mp4 ../
fi
# optional cropping 100px off bottom