video to gif with good quality gif and compression

vid2gif.sh

vid2gif() {
  file=$(realpath $1)
  name=$(basename ${file/.*})
  ffmpeg -y -i "${file}" -vf fps=${3:-24},scale=${2:-480}:-1:flags=lanczos,palettegen "${name}.png"
  ffmpeg -y -i "${file}" -i "${name}.png" -filter_complex "fps=${3:-24},scale=${2:-480}:-1:flags=lanczos[x];[x][1:v]paletteuse" "${name}".gif
  rm "${name}.png"
}