Convert OGV to GIF using ffmpeg

ogv2gif.sh

#!/bin/sh

# Sources: http://unix.stackexchange.com/questions/35282/convert-ogv-video-to-gif-animation
#          http://superuser.com/questions/556029/how-do-i-convert-a-video-to-gif-using-ffmpeg-with-reasonable-quality/556031#556031

if [ "$#" -gt 0 ]; then
	input=$1
	output=${input/.ogv/-ogv.gif}

	if [ -f $output ]; then
		rm $output
	fi

	temp_palette=/tmp/ogv2gif-palette.png
	filters="fps=15,scale=-1:-1:flags=lanczos"

	ffmpeg -v quiet -i $input -vf "$filters,palettegen" $temp_palette
	ffmpeg -v quiet -i $input -i $temp_palette -loop 0 -filter_complex "$filters[x]; [x][1:v] paletteuse" $output

	rm $temp_palette
	exit 0
else
	echo "FATAL: Missing input"
	exit 1
fi