Convert videos to H.264 mkv easily (using ffmpeg)

mkvit.rb

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# Simple script to convert your old video files to H.264 mantaining their quality
#
# Usage:
#  ruby mkvit.rb [extension]
#  this will convert all the videos with the provided ext. in the current dir
#
# Notes:
#  uses: https://trac.ffmpeg.org/wiki/Encode/H.264 
#
ext = ARGV[0]
files_to_convert = Dir["*.#{ext}"]

files_to_convert.each do |file_name|
  puts "Started encoding to h264 #{file_name}"
  
  output = `ffmpeg -i "#{file_name}" -c:v libx264 -preset slow -crf 22 -c:a copy "#{file_name.gsub(/\.(.*)/, '.mkv')}"`
  puts output

  puts "File encoded"
end