screenshot video sample

video.rb

require 'ferrum'
require 'base64'

browser = Ferrum::Browser.new(logger: File.open('/tmp/hoge.log', 'w'))

Dir.mktmpdir do |dir|
  browser.on('Page.screencastFrame') do |params, index, total|
    File.open("#{dir}/#{Time.now.strftime('%Y%m%d%H%M%S%L.jpeg')}", 'w') do |f|
      f.write(Base64.decode64(params['data']))
    end
    browser.page.command('Page.screencastFrameAck', sessionId: params['sessionId'])
  rescue
    warn $!
  end
  browser.go_to("https://google.com")
  browser.page.command('Page.startScreencast', format: 'jpeg', quality: 50, everyNthFramge: 5)
  input = browser.at_xpath("//textarea[@name='q']")
  input.focus.type("hoge", :Enter)
  sleep 1
  browser.page.command('Page.stopScreencast')
  browser.reset
  browser.quit
  system("ffmpeg -f image2 -pattern_type glob -framerate 5 -i '#{dir}/*.jpeg' #{Time.now.strftime('%Y%m%d%H%M%S%L')}.mp4")
end