Converts a list of files to FFmpeg's metadata format

to_metadata.rb

#!/usr/bin/env ruby

require 'csv'

def parse_csv(s)
  return CSV.parse(s)[0][0]
end

title = parse_csv(`ffprobe -i \"#{ARGV[0]}\" -show_entries format_tags=album -v quiet -of csv=\"p=0\"`)
artist = parse_csv(`ffprobe -i \"#{ARGV[0]}\" -show_entries format_tags=artist -v quiet -of csv=\"p=0\"`)
puts ";FFMETADATA1"
puts "title=#{title}"
puts "artist=#{artist}"
start = 0
ARGV.each do |file|
	puts "[CHAPTER]"
	length = parse_csv(`ffprobe -i \"#{file}\" -show_entries format=duration -v quiet -of csv=\"p=0\"`)
	length = Integer(Float(length)*1000000)
	title = parse_csv(`ffprobe -i \"#{file}\" -show_entries format_tags=title -v quiet -of csv=\"p=0\"`)
	title = title || file
	puts "TIMEBASE=1/1000000"
	puts "START=#{start}"
	puts "END=#{start+length}"
	puts "title=#{title}"
	start = start + length
end