Ruby script to convert video files using HandBrakeCLI

hcli.rb

# Ruby script to convert video files using HandBrakeCLI
# @path from extension i_ to o_ using preset
# Skips processing if output file already exists
# http://handbrake.fr/downloads2.php
path   = 'X:Movies/*'     # Change to desired location
i_ext  = 'mkv' 		  # input file extension
o_ext  = 'mp4' 		  # output file extension
preset = 'iPad'		  # HandBrake preset	
Dir[path].each do |file|
	if file =~ /\.#{i_ext}$/
		out = file.gsub(/\.#{i_ext}/, ".#{o_ext}")
		next if File.exists? out
		system("HandBrakeCLI.exe -i \"#{file}\" -o \"#{out}\" --preset=\"#{preset}\"")
	end
end
# Relax, this may take a while ...