#stop on errors
set -e

# Unpack ZIP if we haven't already
if [ ! -d krita-frames ]
then
  mkdir krita-frames
  pushd krita-frames
  unzip ../krita-frames.zip
  popd
fi

# Try both system ffmpeg and our patched version
TAG=blackspecks
for FFMPEG in ffmpeg ~/projects/ffmpeg/ffmpeg
do
  for COLORS in 16 32 64 128 256
  do
    $FFMPEG -hide_banner -i krita-frames/frame00%02d.png -vf "palettegen=max_colors=$COLORS" -y palette.png
    # sierra2 dither seems to work best
    $FFMPEG -hide_banner -r 30 -i krita-frames/frame00%02d.png -i palette.png -filter_complex 'paletteuse=dither=sierra2' -y output-$TAG-$COLORS.gif
  done
  TAG=fixed
done
ls -l *.gif