Screen capture video to GIF converter

gifize.sh

#!/bin/bash

# usage: ./gifize.sh -x left -y top image.gif

X_POS_LEFT='10'
X_POS_RIGHT='(w-text_w-10)'
Y_POS_TOP='10'
Y_POS_BOTTOM='(h-text_h-10)'

X_POS=$X_POS_LEFT
Y_POS=$Y_POS_TOP
INPUT=${@: -1}
OUTPUT="${INPUT%.*}.gif"

while getopts "x:y:" OPTION
do
   echo $OPTION'-'$OPTARG
   case $OPTION in
      x)
         if [ "${OPTARG}" = "left" ]; then
            X_POS=$X_POS_LEFT
         elif [ "${OPTARG}" = "right" ]; then
            X_POS=$X_POS_RIGHT
         fi
         ;;
      y)
         if [ "${OPTARG}" = "top" ]; then
            Y_POS=Y$_POS_TOP
         elif [ "${OPTARG}" = "bottom" ]; then
            Y_POS=$Y_POS_BOTTOM
         fi
         ;;
   esac
done

echo "Creating gif from ${INPUT}"
echo 'x:' $X_POS
echo 'y:' $Y_POS

ffmpeg -i "${INPUT}" \
   -r 12 \
   -vf scale=540:540:force_original_aspect_ratio=decrease,drawtext="timecode='00\:00\:00\:00':fontfile=/Library/Fonts/Courier New.ttf:fontsize=40:rate=60:fontcolor='white':boxcolor=0x000000AA:box=1:x=${X_POS}:y=${Y_POS}" \
   "${OUTPUT}"