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#!/usr/bin/env ruby
# - encoding: utf-8 -
#
# Intro (in German):
# https://depone.net/2016/03/01/video-in-animiertes-gif-konvertieren/
#
# Hat tip for the palette trick to:
# http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html
require 'tmpdir'
DEFAULT_WIDTH=400
DEFAULT_FPS=10
name = ARGV[0]
if ARGV.length == 0 or name == '--help'
puts <<EOL
usage: convert-to-gif <filename> [<width>] [<fps>]
Supply a video file that should be converted as <filename> and resize
the resulting GIF to <width> with <fps> frames per second. Width and
frames per second are optional parameters.
$ convert-to-gif video.mp4
Will result in a GIF with #{DEFAULT_FPS} fps that is #{DEFAULT_WIDTH}
pixel wide.
EOL
exit
end
Dir.mktmpdir do |tmpdir|
palette = File.join(tmpdir, "palette.png")
unless File.exist?(name)
abort "File [#{name}] does not exist. Please see --help."
end
width = ARGV[1] || DEFAULT_WIDTH
fps = ARGV[2] || DEFAULT_FPS
basename = File.basename(name, ".*")
filters="fps=#{fps},scale=#{width}:-1:flags=lanczos"
system("ffmpeg -i #{name} -vf '#{filters},palettegen' -y #{palette}")
system("ffmpeg -i #{name} -i #{palette} -lavfi '#{filters} [x]; [x][1:v] paletteuse' -y #{basename}.gif")
end
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