Convert quicktime movies to gif on a mac

mov2gif.sh

#!/usr/bin/env sh

while [ "$#" -gt 0 ]; do
  case "$1" in
    -f) file="$2"; shift 2;;
    -o) output="$2"; shift 2;;

    --file=*) file="${1#*=}"; shift 1;;
    --output=*) output="${1#*=}"; shift 1;;
    --file|--output) echo "$1 requires an argument" >&2; exit 1;;

    -*) echo "unknown option: $1" >&2; exit 1;;
    *) handle_argument "$1"; shift 1;;
  esac
done

join_path() {
    echo "${1:+$1/}$2" | sed 's#//#/#g'
}

function gen_out_file_name {
  base=$(basename -a -s .mov $file)
  join_path $output ${base}.gif
}

function dimensions {
  # Future Enhanceent: allow scaling
  ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 $file
}

function output_full_path {
  if [[ -d $output ]]; then
    echo $(gen_out_file_name)
  else
    echo $output
  fi
}

function run {
  ffmpeg -i $file -s $(dimensions) -pix_fmt rgb24 -r 10 -f gif - | gifsicle --optimize=3 --delay=3 > $(output_full_path)
}

function preflight {
  if [[ ! $output ]]; then
    echo "No output param provided"
    exit 1
  fi

  if [[ ! $file ]]; then
    echo "No file param provided"
    exit 1
  fi
}

preflight
run