Handy script for converting stuff to GIFs

converttogif.sh

#!/usr/bin/env bash
set -e

delpalette() {
  rm -f "$palette"
}

usage() {
  echo >&2 "Usage : $0 [-f fps] [-x xres] <input> <output>"
  exit 1
}

fps=10
xres=320
while getopts 'f:x:' arg; do
  echo "$@"
  case "$arg" in
  f) fps="$OPTARG" ;;
  x) xres="$OPTARG" ;;
  *) usage ;;
  esac
done
shift $((OPTIND-1))

[[ $# -eq 2 ]] || usage

palette=$(mktemp /tmp/paletteXXXXX.png)
trap delpalette EXIT

ffmpeg -y -i "$1" -vf "fps=${fps},scale=${xres}:-1:flags=lanczos,palettegen" "$palette"
ffmpeg -i "$1" -i "$palette" \
  -filter_complex "fps=${fps},scale=${xres}:-1:flags=lanczos[x];[x][1:v]paletteuse" \
  "$2"

exit 0