aviglitch-swap.rb

require 'rubygems'
require 'aviglitch'

base, keys = ARGV

keyframes = AviGlitch.new(keys).frames.map do |frame|
  if frame.is_keyframe?
    frame.data
  else
    nil
  end
end.compact

avi = AviGlitch.new(base)
avi.glitch_with_index(:keyframe) do |data, idx|
  keyframes[idx % keyframes.size]
end

avi.write 'out.avi'