high-quality-gif

#!/usr/bin/env ruby
# frozen_string_literal: true

require 'pathname'
require 'tempfile'

def ffmpeg(*args)
  system('ffmpeg', *args)
end

if ARGV.empty?
  warn("Usage: #{$PROGRAM_NAME} <video_files>")
  exit 1
end

ARGV.each do |input_video|
  output_gif = Pathname.new(input_video).sub_ext('.gif').to_s
  palette_png = Tempfile.new(['hqg-palette', '.png'])
  palette_path = File.expand_path(palette_png.path)

  begin
    ffmpeg('-i', input_video, '-y', '-vf', 'palettegen', palette_path)
    ffmpeg('-i', input_video, '-i', palette_path, '-filter_complex', '[0:v] paletteuse', output_gif)
  ensure
    palette_png.close
    palette_png.unlink
  end
end