Ruby script to convert .m4a files to mp3 (install lame and faad2 via homebrew first)

mp4convert.rb

#!/usr/bin/ruby
require 'rubygems'
require 'mp4info'

path = ARGV[0]

Dir.foreach(path) do |file| 

	file_path = File.join path, file

	if File.file? file_path and File.extname(file_path) == ".m4a"

		puts file_path

		file_name = file_path.match(/([^\/]+)$/)[0]
		mp3_path = "#{file_path}.mp3"
		wav_path = "/tmp/#{file_name}.wav"

		info = MP4Info.open file_path
		info = info.instance_eval("@data_atoms")

		album = info["ALB"]
		apple_store_id = info["APID"]
		artist = info["ART"]
		comment = info["CMT"]
		album_art = info["COVR"]
		compilation = info["CPIL"]
		copyright = info["CPRT"]
		year = info["DAY"]
		disk = info["DISK"]
		genre = info["GNRE"]
		grouping = info["GRP"]
		title = info["NAM"]
		rating = info["RTNG"]
		tempo = info["TMPO"]
		encoder = info["TOO"]
		track_no = info["TRKN"]
		author = info["WRT"]

		system "/usr/local/Cellar/faad2/2.7/bin/faad -o '#{wav_path}' '#{file_path}'"
		system "/usr/local/Cellar/lame/3.99.3/bin/lame -b 192 -h --tt '#{title}' --ta '#{artist}' --tl '#{album}' --ty '#{year}' --tc '#{comment}' --tn '#{track_no}' --tg '#{genre}' '#{wav_path}' '#{mp3_path}'"

		File.delete file_path

	end
end

I tried it, and received the following error:

dyld: lazy symbol binding failed: Symbol not found: _rb_ary_new_from_values
  Referenced from: /Users/me/.gem/ruby/2.1.3/gems/psych-2.0.8/lib/psych.bundle
  Expected in: flat namespace

dyld: Symbol not found: _rb_ary_new_from_values
  Referenced from: /Users/me/.gem/ruby/2.1.3/gems/psych-2.0.8/lib/psych.bundle
  Expected in: flat namespace

Trace/BPT trap: 5

No clue where to begin with troubleshooting that one--just thought I’d mention my experience!