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Convert all m4a files in a directory into mp3
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| #!/usr/bin/env 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.basename file_path, ".m4a" | |
| mp3_path = "#{file_name}.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 "faad -o '#{wav_path}' '#{file_path}'" | |
| system "lame --abr 64 -h --tt '#{title}' --ta '#{artist}' --tl '#{album}' --ty '#{year}' --tc '#{comment}' --tn '#{track_no}' --tg '#{genre}' '#{wav_path}' '#{mp3_path}'" | |
| File.delete wav_path | |
| end | |
| end |
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Usage:
Requirements:
This ruby script rely on ruby gem 'mp4info' and package faad2 and lame, which can be installed by the following commands on OS X with brew