Ruby script to convert dir of mp3s to oggs

mp32ogg.rb

#!/usr/bin/env ruby
require 'rubygems'

@dir = ARGV[0]
@i = 0
Dir.glob("#{@dir}/*.mp3").each do |mp3|
  ogg = mp3.gsub('mp3', 'ogg')
  system "ffmpeg -i \"#{mp3}\" -acodec libvorbis -ac 2 \"#{ogg}\""
  @i += 1
end
puts "Converted #{@i} mp3s to ogg format!"