HandBrakeのCLIでmp4に変換

friends_extractor.rb

handbrake_path = "/Volumes/HandBrake-0.9.8-MacOSX.6_CLI_x86_64/HandBrakeCLI"
preset = "--preset=\"iPhone & iPod Touch\""
native_language = "--native-language eng"
subtitle = "--subtitle 2 --subtitle-burn 2"
input_base_dir = "/Users/yasuhisa/Desktop"
output_base_dir = "/Users/yasuhisa/Desktop"
cdr_id = 1

(1..4).each {|chapter|
  opts = ["-i", "#{input_base_dir}/FRIENDS_1_#{cdr_id}.cdr",
    "-c", "1",
    "-o", "#{output_base_dir}/FRIENDS_#{cdr_id}_#{chapter}.mp4",
    subtitle, native_language, preset].join(" ")
  cmd = handbrake_path + " " + opts
  system cmd
}