fixing renderText script

snow.rb

@@ -0,0 +1,40 @@
+#!/usr/bin/env ruby
+# encoding: utf-8
+require File.expand_path '../helper.rb', $0
+
+doc = <<-DOC.gsub '__FILE__', File.basename($0)
+Glitch with SNOW codec.
+
+Usage:
+  __FILE__ <infile> [-s <n> -d <n> --debug] -o <outfile>
+  __FILE__ -h | --help
+
+Options:
+  -o <outfile>  Set output file name.
+  -s <n>        Set start position of the video by seconds.
+  -d <n>        Set duration of the result video by seconds.
+  --debug       Flag for debugging [default: false].
+  -h --help     Show this screen.
+DOC
+
+begin
+  options = Docopt::docopt doc
+  mktmpdir(options['--debug']) do |tmpdir|
+    other_options = ''
+    other_options += ' -ss ' + options['-s'] if options['-s']
+    other_options += ' -t ' + options['-d'] if options['-d']
+    cmd = Cocaine::CommandLine.new 'ffmpeg', '-i :infile %s -strict -2 -c:v snow -pix_fmt yuv420p -y -q:v 1 -an :outfile' % other_options
+    snowfile = tmpdir.join('snow.avi')
+    cmd.run infile: options['<infile>'], outfile: snowfile.to_s
+    a = AviGlitch.open snowfile
+    a.glitch :keyframe do |f|
+      f.gsub rand(10).to_s, 'a'
+    end
+    glitchfile = tmpdir.join 'glitch.avi'
+    a.output glitchfile
+    cmd = Cocaine::CommandLine.new 'ffmpeg', '-i :infile -an -q:v 0 :outfile'
+    cmd.run infile: glitchfile.to_s, outfile: options['-o']
+  end
+rescue Docopt::Exit => e
+  puts e.message
+end