.mov to .gif converter

gifenc.sh

#!/bin/sh
 
# sh gifenc.sh input.mp4 output.gif [width] [height]
# Optionally accepts width / height (one or both).
# http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html

if [ -z "$1" ];then
  echo "gifenc input.mov output.gif [width] [height] [fps] [slowdown]"
  exit 0
fi
 
palette="/tmp/palette.png"
filters="pad=0:0:0:00:white"
if [ ! -z $3 ]; then
  if [ ! -z $4 ]; then
    filters="$filters,scale=$3:$4"
  else
    filters="$filters,scale=$3:-1"
  fi
  filters="$filters:flags=lanczos"
fi
if [ ! -z $5 ]; then
  filters="$filters,fps=$5"
fi
if [ ! -z $6 ]; then
  filters="$filters,setpts=$6*PTS"
fi
 
ffmpeg -v warning -i "$1" -vf "$filters,palettegen" -y $palette
ffmpeg -v warning -i "$1" -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y $2