A small Ruby script to remove private frames (PRIV) from ID3 tagged MP3 files.

id3_remove_private_frames.rb

#!/usr/bin/env ruby
# 
# Requirements (Ubuntu 14.04):
#     apt-get install libid3-3.8.3-dev
#     gem install id3lib
# 
# Usage:
#     ./id3_remove_private_frames.rb file1.mp3 file2.mp3 ...
# 

require 'rubygems'
require 'id3lib'

updated = 0
removed = 0

begin
  ARGV.each do |path|
    tag    = ID3Lib::Tag.new(path)
    before = tag.length
    tag.delete_if{ |frame| frame[:id] == :PRIV }
    after  = tag.length
    print "#{path}: "
    if before == after
      puts "\e[32mno frames removed\e[0m"
    else
      diff     = before-after
      removed += diff
      updated += 1
      tag.update!
      puts "\e[31m#{diff} frames removed\e[0m"
    end
  end
rescue Interrupt
  exit 1
ensure
  puts "#{removed} frames from #{updated} files removed"
end