movie2gif.sh

#!/usr/bin/env bash

set -eu

main() {
  local -r workspace="____movie2gif"
  local -r movie_filename="$1"
  local -r ratio="$2%"
  local -r frameRate="$3"
  local -r output_filename="${movie_filename%.*}.gif"

  [[ ! -f "$workspace" ]] && mkdir -p "$workspace"
  cd "$workspace"

  { # split
    ffmpeg -i "../$movie_filename" -an -r $frameRate %04d.png
  }

  { # reduce_size
    convert *.png -resize $ratio parapara_%04d.png
  }

  {
    convert parapara_*.png "$output_filename"
  }

  mv "$output_filename" ../
  rm -fr ./*

  echo "Created. $output_filename"
}

main "$1" "${M2G_SCALE:-25}" "${M2G_FRAME_RATE:-5}"