Simple video file to GIF file using FFMPEG/ImageMagick script

vid2gif.sh

#!/usr/bin/env bash
FFMPEG=/usr/local/bin/ffmpeg
CONVERT=/usr/local/bin/convert

if [ -z "$1" ] || [ -z "$2" ]
  then
    echo "Must specify an input video file and output gif file"
	exit 1
fi

$FFMPEG -i $1 -vf scale=320:-1 -r 10 -f image2pipe -vcodec ppm - | $CONVERT -delay 5 -loop 0 - gif:- | $CONVERT -layers Optimize - $2