movgif.sh

#!/bin/bash
# vi: set ft=sh :

if [ $# -lt 2 ]; then
  echo "Usage: movgif [options]

    -i, --input
    -o, --ouput
    -w, --width
    -h, --height
"
  exit 0
fi

RED="\033[31m"
ORANGE="\033[38;5;208m"
GREEN="\033[32m"
RESET="\033[0m"

input=""
output=""
palette="/tmp/palette.png"
fps=30
width=375
height=-1
loglevel=warning

while [[ $# > 1 ]]; do
  key="$1"

  case $key in
    -i|--input)
    input="$2"
    shift
    ;;
    -o|--output)
    output="$2"
    shift
    ;;
    -w|--width)
    width="$2"
    shift
    ;;
    -h|--height)
    height="$2"
    shift
    ;;
    *)
    echo -e "${RED}Unknown option $1$RESET"
    exit 1
    ;;
  esac

  shift
done

filters="fps=$fps,scale=$width:$height:flags=lanczos"

if [ ! $input ]; then
  echo -e "${RED}Please specify input file with -i path/to/file.mov$RESET"
  exit 1
fi

if [ ! $output ]; then
  echo -e "${RED}Please specify output file with -o path/to/file.gif$RESET"
  exit 1
fi

echo -e "$ORANGE==> $input -> $output$RESET"
echo -e "$ORANGE==> Generating palette$RESET"

ffmpeg \
  -loglevel $loglevel \
  -y \
  -i $input \
  -vf "$filters,palettegen" \
  $palette

echo -e "$ORANGE==> Generating gif$RESET"

ffmpeg \
  -y \
  -loglevel $loglevel \
  -i $input \
  -i $palette \
  -lavfi "$filters [x]; [x][1:v] paletteuse" \
  $output

echo -e "$GREEN==> Written to $output$RESET"