gistfile1.rb

namespace :video do
  desc "Create a bunch of sent messages to test reporting & analytics, with random contacts"
  task :transcode do
    Dir["*.mov"].each do |mov|

      # REVISIT: Get width and height from the video:
      width = 568
      height = 386

      ogv = mov.sub(%r{.mov}i, '.ogv')
      if !FileTest.exists?(ogv) || File.mtime(mov) >= File.mtime(ogv)
	system "ffmpeg2theora --videoquality 5 --audioquality 1 --max_size #{width}x#{height} #{mov}"
      end

      mp4 = mov.sub(%r{.mov}i, '.mp4')
      if !FileTest.exists?(mp4) || File.mtime(mov) >= File.mtime(mp4)
	# 400kbps is about what my first screencast used in QuickTime format. Halve it, this codec is better (I hope)
	system "HandBrakeCLI --preset 'iPhone & iPod Touch' --width #{width} --vb 200 --two-pass --turbo --input #{mov} --output #{mp4}"
      end

      webm = mov.sub(%r{.mov}i, '.webm')
      if !FileTest.exists?(webm) || File.mtime(mov) >= File.mtime(webm)
	system %Q{
	  (ffmpeg -pass 1 -passlogfile #{mp4} -threads 16  -keyint_min 0 -g 250 -skip_threshold 0 -qmin 1 -qmax 51 -i #{mp4} -vcodec libvpx -b 409600 -s #{width}x#{height} -aspect 4:3 -an -y -f webm /dev/null && \
	  ffmpeg -pass 2 -passlogfile #{mp4} -threads 16  -keyint_min 0 -g 250 -skip_threshold 0 -qmin 1 -qmax 51 -i #{mp4} -vcodec libvpx -b 409600 -s #{width}x#{height} -aspect 4:3 -acodec libvorbis -y -f webm #{webm}) || \
	  rm #{webm}
	}
      end

    end
  end
end