Rename a bunch of destroyallsoftware screencasts with help from ffmpeg, tesseract and ruby

convert.rb

require 'tesseract'
 
ENGINE = Tesseract::Engine.new { |e| e.language = :eng }
 
def grab_screenshot(file)
  `ffmpeg -i #{file} -ss 0 -vframes 1 -f image2 #{screenshot_name(file)} -loglevel quiet`
  screenshot_name(file)
end
 
def screenshot_name(file)
  "keyframe-#{file}.jpg"
end
 
def extract_screencast_name(image_file)
  ENGINE.text_for(image_file).split("\n").last.strip.split('#').last.gsub(/[^0-9a-z ]/i, '')
end
 
def rename_file(file, screencast_name)
  File.rename(file, screencast_name + File.extname(file))
end
 
def main
  Dir["*.mov"].each do |file|
    image_file = grab_screenshot(file)
    screencast_name = extract_screencast_name(image_file)
    puts rename_file(file, screencast_name)
  end
end
 
main