I just felt the need for a script that could extract the audio track of a video, transcode it and save it as an mp3 file … 2 hours later I was finished (get the Gist). 😀 It uses VLC to do hard work. 😉
Thanks to Kris Hom for the inspiration. 🙂
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#!/usr/bin/env ruby -rubygems | |
# | |
# Author: Riyad Preukschas <riyad@informatik.uni-bremen.de> | |
# License: Mozilla Public License 2.0 | |
# | |
# Transcode any file ffmpeg can play to mp3. | |
require 'optparse' | |
require 'shellwords' | |
# | |
# helpers | |
# | |
def puts_error(message) | |
puts "Error: #{message}" | |
end | |
def puts_warning(message) | |
puts "Warning: #{message}" | |
end | |
# | |
# parse options | |
# | |
options = { | |
:bit_rate => 192, | |
} | |
begin | |
OptionParser.new do |opts| | |
opts.banner = "Usage: convert2mp3 [options] FILE [<FILE ...>]" | |
opts.separator "" | |
opts.separator "Conversion Options:" | |
opts.on("-f", "--[no-]force", "Overwrite mp3 file if it exists already") do |f| | |
options[:force_overwrite] = f | |
end | |
opts.on("-o", "--output-directoy [DIRECTORY]", "Save converted files to this directory") do |out_dir| | |
unless File.directory?(out_dir) | |
puts_error %Q(Wrong output directory. "#{out_dir}" is not a directory.) | |
exit 1 | |
end | |
options[:output_dir] = out_dir | |
end | |
opts.separator "" | |
opts.separator "mp3 Options:" | |
opts.on("-b", "--bit-rate [RATE]", Integer, "Bit rate in kbit/s (default: #{options[:bit_rate]})") do |b| | |
options[:bit_rate] = b | |
end | |
opts.separator "" | |
opts.separator "General Options:" | |
opts.on_tail("-h", "--help", "Show this message") do | |
puts opts | |
exit 0 | |
end | |
opts.on_tail("-v", "--[no-]verbose", "Be more verbose") do |v| | |
options[:verbose] = v | |
end | |
end.parse! | |
rescue OptionParser::InvalidOption => e | |
puts_error e.message | |
exit 1 | |
end | |
# | |
# gather source files | |
# | |
if ARGV.empty? | |
puts_error "No files given." | |
exit 1 | |
end | |
source_files = [] | |
while !ARGV.empty? | |
source_path = ARGV.shift | |
unless File.exists?(source_path) | |
puts_warning %Q(Skipping "#{source_path}". It doesn't exist.) | |
next | |
end | |
unless File.file?(source_path) | |
puts_warning %Q(Skipping "#{source_path}". It's not a file.) | |
next | |
end | |
source_files << source_path | |
end | |
# | |
# ffmpeg command line options | |
# | |
FFMPEG = 'ffmpeg' | |
TRANSCODING = '-vn -ab BIT_RATEk -vbr on -f mp3'. | |
gsub('BIT_RATE', options[:bit_rate].to_s) | |
VERBOSITY = options[:verbose] ? '-v info' : '-v quiet' | |
if `which #{FFMPEG} > /dev/null` && $? != 0 | |
puts_error "Couldn't find ffmpeg." | |
exit 1 | |
end | |
source_files.each do |source_file| | |
source_dir = File.dirname(source_file) | |
output_dir = options[:output_dir] || source_dir | |
output_file = File.join(output_dir, "#{File.basename(source_file, ".*")}.mp3") | |
if File.exist?(output_file) | |
if options[:force_overwrite] | |
puts_warning %Q(Output file exists. "#{output_file}" will be overwritten.) if options[:verbose] | |
else | |
puts_warning %Q(Output file exists already. Skipping "#{output_file}".) | |
next | |
end | |
end | |
puts %Q(Converting "#{source_file}") | |
unless system("#{FFMPEG} #{VERBOSITY} -y -i #{source_file.shellescape} #{TRANSCODING} #{output_file.shellescape}") | |
puts_error "Conversion failed. Try using the -v option for more detailed output." | |
end | |
puts if options[:verbose] | |
end |
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#!/usr/bin/env ruby -rubygems | |
# | |
# Author: Riyad Preukschas <riyad@informatik.uni-bremen.de> | |
# License: Mozilla Public License 2.0 | |
# | |
# Transcode any file VLC can play to mp3. | |
require 'optparse' | |
require 'mkmf' | |
require 'shellwords' | |
# | |
# helpers | |
# | |
def puts_error(message) | |
puts "Error: #{message}" | |
end | |
def puts_warning(message) | |
puts "Warning: #{message}" | |
end | |
# | |
# parse options | |
# | |
options = { | |
:bit_rate => 192, | |
:sampling_rate => 44100, | |
} | |
begin | |
OptionParser.new do |opts| | |
opts.banner = "Usage: convert2mp3 [options] FILE [<FILE ...>]" | |
opts.separator "" | |
opts.separator "Conversion Options:" | |
opts.on("-f", "--[no-]force", "Overwrite mp3 file if it exists already") do |f| | |
options[:force_overwrite] = f | |
end | |
opts.on("-o", "--output-directoy [DIRECTORY]", "Save converted files to this directory") do |out_dir| | |
unless File.directory?(out_dir) | |
puts_error %Q(Wrong output directory. "#{out_dir}" is not a directory.) | |
exit 1 | |
end | |
options[:output_dir] = out_dir | |
end | |
opts.separator "" | |
opts.separator "mp3 Options:" | |
opts.on("-b", "--bit-rate [RATE]", Integer, "Bit rate in kbit/s (default: #{options[:bit_rate]})") do |b| | |
options[:bit_rate] = b | |
end | |
opts.on("-s", "--sampling-rate [RATE]", Integer, "Sampling rate in Hz (default: #{options[:sampling_rate]})") do |s| | |
options[:sampling_rate] = s | |
end | |
opts.separator "" | |
opts.separator "General Options:" | |
opts.on_tail("-h", "--help", "Show this message") do | |
puts opts | |
exit 0 | |
end | |
opts.on_tail("-v", "--[no-]verbose", "Be more verbose") do |v| | |
options[:verbose] = v | |
end | |
end.parse! | |
rescue OptionParser::InvalidOption => e | |
puts_error e.message | |
exit 1 | |
end | |
# | |
# gather source files | |
# | |
if ARGV.empty? | |
puts_error "No files given." | |
exit 1 | |
end | |
source_files = [] | |
while !ARGV.empty? | |
source_path = ARGV.shift | |
unless File.exists?(source_path) | |
puts_warning %Q(Skipping "#{source_path}". It doesn't exist.) | |
next | |
end | |
unless File.file?(source_path) | |
puts_warning %Q(Skipping "#{source_path}". It's not a file.) | |
next | |
end | |
source_files << source_path | |
end | |
# | |
# VLC command line options | |
# | |
# using find_executable() will create a mkmf.log file :( | |
vlc_paths = [ | |
'vlc', | |
'/Applications/VLC.app/Contents/MacOS/VLC', | |
File.expand_path('~/Applications/VLC.app/Contents/MacOS/VLC'), | |
] | |
VLC = vlc_paths.find { |path| find_executable0(path) } | |
INTERFACE = '-I dummy' | |
PLAYBACK = '--no-loop --no-repeat --play-and-exit' | |
TRANSCODING = '--sout="#transcode{vcodec=dummy,acodec=mp3,ab=BIT_RATE,channels=2,samplerate=SAMPLING_RATE}:standard{access=file,mux=raw,dst=\'DESTINATION\'}"'. | |
gsub('BIT_RATE', options[:bit_rate].to_s). | |
gsub('SAMPLING_RATE', options[:sampling_rate].to_s) | |
VERBOSITY = options[:verbose] ? '' : '-q 2>/dev/null 1>/dev/null' | |
if VLC.nil? | |
puts_error "Couldn't find VLC." | |
exit 1 | |
end | |
source_files.each do |source_file| | |
source_dir = File.dirname(source_file) | |
output_dir = options[:output_dir] || source_dir | |
output_file = File.join(output_dir, "#{File.basename(source_file, ".*")}.mp3") | |
if File.exist?(output_file) | |
if options[:force_overwrite] | |
puts_warning %Q(Output file exists. "#{output_file}" will be overwritten.) if options[:verbose] | |
else | |
puts_warning %Q(Output file exists already. Skipping "#{output_file}".) | |
next | |
end | |
end | |
puts %Q(Converting "#{source_file}") | |
unless system("#{VLC} #{PLAYBACK} #{INTERFACE} #{TRANSCODING.gsub('DESTINATION', output_file.gsub(/'/, ""))} #{source_file.shellescape} #{VERBOSITY}") | |
puts_error "Conversion failed. Try using the -v option for more detailed output." | |
end | |
puts if options[:verbose] | |
end |
Update 2014-03-01:
- Check whether VLC is installed
- Should also work on Linux now
- Increase default bit rate to 192kbit/s
- Fixed bug where the file/playlist would repeat endlessly
Update 2014-11-05:
- Also look for VLC in “~/Application/”
Update 2016-03-05
- Added a ffmpeg version