http://mgkkk.cocolog-nifty.com/blog/2015/11/ep097-506a.html

dl_mgkkk_podcast.rb

#!/usr/bin/env ruby
require 'open-uri'

base_urls = %w(http://mgkkk.cocolog-nifty.com/blog/files/
              http://mgkkk.la.coocan.jp/podcast/
             )
start_i = ARGV[0].nil? ? 0   : ARGV[0].to_i
end_i   = ARGV[1].nil? ? 211 : ARGV[1].to_i

base_i=0
for i in start_i..end_i
  begin
    puts "start dl:\t#{base_urls[base_i]}episode#{i}.mp4"
    open(base_urls[base_i] + "episode#{i}.m4a") do |dlfile|
      File.open("episode#{i}.m4a", "wb") do |output|
        output.puts dlfile.read
      end
    end
    puts "done dl:\t#{base_urls[base_i]}episode#{i}.mp4"
  rescue OpenURI::HTTPError => e
    base_i += 1
    break if base_urls[base_i].nil?
    retry
  end
end