mo(vie) to gif

motogif.sh

#!/bin/bash
 
W=0
DROP=1
F=2

while getopts ":w:d:f:" opt; do
  case $opt in
    w)
      W=$OPTARG
      ;;
    d)
	  DROP=$OPTARG
	  ;;
	f)
	  F=$OPTARG
	  ;;
    ?)
      echo "Usage" >&2
      exit 1
      ;;
  esac
done

# Shift, we should only have the input filename remaining now
shift $(($OPTIND-1))
INPUT_FILE=$1
OUTPUT_FILE="${INPUT_FILE%.*}.moto.gif"

# Get info from the input file
eval $(ffprobe -loglevel quiet -show_streams "$INPUT_FILE" | grep -E "width|height")

# Compute new size
if [ $W -gt 0 ]; then
	height=$((height*W/width))
	width=$W
	echo "Resizing to ${width}x${height}..."
fi

# Compute framerate/droprate
DELAY=30
if [ $DROP -gt 1 ]; then
	DELAY=$((30/DROP))
fi

# Create a directory for the images
dir=`mktemp -d -t motogif`
if [ $? -ne 0 ] ; then
	echo "Failed to create temp dir..."
    exit 1
fi

echo "Splitting movie to image sequence..."
ffmpeg -loglevel warning -i "$INPUT_FILE" -s "${width}x${height}" -f image2 $dir/a%03d.png

FRAMES=`ls -l $dir/*.png | wc -l`

echo "Converting to gif..."
convert +dither -fuzz ${F}% -delay 1x${DELAY} `seq -f $dir/a%03g.png 1 ${DROP} ${FRAMES}` -coalesce -layers OptimizeTransparency ${OUTPUT_FILE}

du -h ${OUTPUT_FILE}

# Clean up the temporary directory
rm -r $dir
if [ $? -eq 0 ] ; then
	echo "Cleaned up temp dir..."
    exit 1
fi