Convert media files to MP3 using ffmpeg and lame. With automatic tagging.

any2mp3

#!/usr/bin/env ruby

require 'tempfile'

opts = Hash[*%w[--tt title
                --ta artist
                --tl album
                --ty year
                --tc comment
                --tn track
                --tg genre]]

ARGV.each do |file|
  temp = Tempfile.new(File.basename($PROGRAM_NAME))
  dest = File.basename(file, File.extname(file)) + '.mp3'
  info = {}
  %x[ffprobe '#{file}' 2>&1].grep(/^    /) do |line|
    key, val = line.split(/:/, 2)
    info[key.strip.downcase] = val.strip
  end
  args = []
  opts.each do |opt, tag|
    args << opt << info[tag]  if info.has_key? tag
  end
  system('ffmpeg', '-i', file, '-f', 'wav', '-y', temp.path)
  system('lame', '-v', temp.path, dest, *args)
  temp.delete
end