Convert .wma to .mp3

wma_to_mp3.rb

#!/usr/bin/env ruby

class WmaToMp3
  TEMP_WAV = 'audiodump.wav'

  def self.convert!(path)
    wma_files = Dir.glob(File.join(path, "**/*.wma"), File::FNM_CASEFOLD)

    if wma_files.empty?
      STDOUT.puts "No .wma files found at: #{path}"
      exit
    end

    wma_files.each do |wma_file|
      STDOUT.puts "-----------------------"
      STDOUT.puts "Converting: #{wma_file}"
      STDOUT.puts "-----------------------"

      wma_ext = File.extname(wma_file)
      mp3_file = File.join(File.dirname(wma_file), File.basename(wma_file, wma_ext) + '.mp3')

      convert = [
        %Q[mplayer -vo null -vc dummy -af resample=44100 -ao pcm -ao pcm:waveheader "#{wma_file}"],
        %Q[lame -m s #{TEMP_WAV} -o "#{wma_file}".mp3],
        %Q[rm -vf #{TEMP_WAV}],
      ].join(' && ')

      STDOUT.puts %x[#{convert}]
    end

    STDOUT.print "\nRemove .wma files? (Y/N) "
    if STDIN.gets.chomp == 'Y'
      STDOUT.puts %x[rm -vf #{wma_files.map { |f| %Q["#{f}"] }.join(' ')}]
    end
  end
end

if __FILE__ == $0
  if ARGV[0].nil?
    STDERR.puts "Usage: #{$0} <path>"
    exit(1)
  end

  WmaToMp3.convert!(ARGV[0])
end