video2gif

#!/bin/bash

filename=${0##*/}

usage() {
  echo "Usage: $filename [OPTION]..."
  echo "Try '$filename --help' for more information."
}

help() { 
  echo "Usage: $filename [OPTION]..."
  echo
  echo "    -h, --help          Display this help"
  echo "    -i, --in            Set file name for input video file (.mkv, .mp4, .webm, etc)"
  echo "    -o, --out           Set file name for output .gif (Should be in .gif format)"
  echo "    -q, --quality       GIF quality (360 by default)"
  echo "    -f, --fps           GIF framerate"
  echo "    -s, --start         Start time"
  echo "    -d, --duration      Duration"
}

if [ $# == 0 ] ; then
  usage
  exit 1;
fi

while [ "$1" != "" ]; do
  PARAM=$1
  VALUE=$2
  case $PARAM in
    -h | --help)
      help
      exit
    ;;
    -i | --input)
      INPUT=$VALUE
      shift
    ;;
    -q | --quality)
      QUALITY=$VALUE
      shift
    ;;
    -o | --output)
      OUTPUT=$VALUE
      shift
    ;;
    -f | --fps)
      FPS=$VALUE
      shift
    ;;
    -s | --start)
      START=$VALUE
      shift
    ;;
    -d | --duration)
      DURATION=$VALUE
      shift
    ;;
    *)
      usage
      exit 1
    ;;
  esac
    shift
done

if [ -z $OUTPUT ]; then
  OUTPUT="${INPUT%.*}.gif"
fi

if [ -z $QUALITY ]; then
  QUALITY="360"
fi

if [[ $FPS ]]; then
  fps="fps=$FPS,"
fi

if [[ $START ]]; then
  start="-ss $START"
fi

if [[ $DURATION ]]; then
  duration="-t $DURATION"
fi

palette="${OUTPUT%.*}.png"

ffmpeg -y $start $duration -i $INPUT -vf $fps scale=$QUALITY:-1:flags=lanczos,palettegen $palette

ffmpeg $start $duration -i $INPUT -i $palette -filter_complex "scale=$QUALITY:-1:flags=lanczos[x];[x][1:v]paletteuse" $OUTPUT

rm "$palette" 2> /dev/null