Windows capable PopenRunner subclass for the handbrake ruby gem.

popenrunner.rb

require "rubygems"
require "handbrake"
require 'rbconfig'

$on_mswin = Config::CONFIG['target_os'].match(/^mingw/)
require 'win32/open3' if $on_mswin

class MyRunner < HandBrake::CLI::PopenRunner
    def command(args)
        return super if !$on_mswin
        "\"#{args.unshift(@cli.bin_path).collect { |a| a.gsub(%r(")) { %('""') } }.join('" "')}\""
    end
end

hb_path = "HandBrakeCLI.exe"
raise Exception, "No HandBrakeCLI executable" if !File.exists?(hb_path)
hb = HandBrake::CLI.new(
    :bin_path => hb_path,
    :runner => lambda { |cli| MyRunner.new(cli) },
    :trace => false
)
puts "HandBrakeCLI is #{hb.update ? "not " : ""}up to date."