#!/bin/bash
#
# gifit - Convert videos into GIFs with ffmpeg
# Copyright © 2019-2021 Keith Irwin www.ki9.us 
#
#	This program is free software: you can redistribute it and/or modify
#	it under the terms of the GNU General Public License as published by
#	the Free Software Foundation, either version 3 of the License, or
#	(at your option) any later version.
#
#	This program is distributed in the hope that it will be useful,
#	but WITHOUT ANY WARRANTY; without even the implied warranty of
#	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#	GNU General Public License for more details.
#
#	You should have received a copy of the GNU General Public License
#	along with this program.  If not, see <http://www.gnu.org/licenses/>.
#


# Variables
scale="${2:-600}" # Width in pixels (default 600)
fps="${3:-20}" # Frames per second (default 20)
filters="fps=$fps,scale=$scale:-1:flags=lanczos[x];[x]split[x1][x2]; [x1]palettegen[p];[x2][p]paletteuse"
echo "$filters"
outname="${1%.*}.gif" # Name for output

# Check for arguments
if [ $# -lt 1 ] || [ $# -gt 3 ]; then
	echo "USAGE: $0 filename [fps] [scale]"
	exit 1
fi

# Do the conversion
ffmpeg -i "$1" -filter_complex "$filters" "$outname"