From: "Jan E." <lists@...>
Date: 2012-04-04T02:25:40+09:00
Subject: Re: extracting mp3 image and its data when upload is done

Hi,

Of course it's possible. Even if there were no libraries, you could 
still extract the bits "by hand".

But you don't have to. Simply install one of the ID3 libraries like 
taglib-ruby:

http://robinst.github.com/taglib-ruby/

You can then extract the cover picture:

####
require 'taglib'

TagLib::MPEG::File.open("C:/music/test.mp3") do |mp3|
  cover = mp3.id3v2_tag.frame_list('APIC').first.picture
  File.open('C:/music/cover.jpg', 'wb') {|f| f << cover}
end
####

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