Make high quality gif

makegif.sh

# Usage:
# <movie_file> <start_time> <duration> <output_name>
# ./makegif.sh movie.mp4 00:00 10 output.gif
#

# Check if ffmpeg is installed
if ! which ffmpeg >/dev/null; then
  printf "\n\033[0;31mYou need to install ffmpeg to use this! Visit: https://ffmpeg.org/download.html\033[0m\n\n"
  exit 1
fi

start_time=$2
duration=$3
filters="fps=30,scale=500:-1:flags=lanczos"
timestamp=$(date +%s)
palette=$timestamp"_palette.png"

# Create color palette based on video
echo 1/4 Creating color palette...
ffmpeg -v warning -ss $start_time -t $duration -i $1 -vf "$filters,palettegen=stats_mode=diff" -y $palette

echo 2/4 Creating gif...
ffmpeg -v warning -ss $start_time -t $duration -i $1 -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y $4

echo 3/4 Remove palette file...
rm $palette

if which gifsicle >/dev/null; then
  echo 3.5/4 Optimize gif...
  gifsicle -O3 $4 -o $4
fi

echo 4/4 $4 created!