#!/usr/bin/env ruby
# Generate datamoshing

require 'rubygems'
require 'aviglitch'

if ARGV.size < 1 || ARGV.first == '--help'
  puts <<-BANNER.gsub(/^\s+/, '')
    Usage: #{File.basename $0} INPUT [OUTPUT]
    Generate a datamoshing video from INPUT to OUTPUT (./out.avi by default).
  BANNER
  exit 0
end

input, output = ARGV

a = AviGlitch.new input
a.glitch_with_index :keyframe do |frame, i|
  if i == 0  # keep the first frame
    frame
  else
    "\000" * frame.size
  end
end
a.write(output || 'out.avi')