diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..8b9ddf3
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1 @@
+gem 'ruby_sscanf'
diff --git a/vodcmp.rb b/vodcmp.rb
index 846f3af..aba9782 100644
--- a/vodcmp.rb
+++ b/vodcmp.rb
@@ -8,16 +8,62 @@
 =end
 
 require "json"
+require "ruby_sscanf"
+
+def cvt_time(str)
+	fmt0 = "%f"
+	fmt1 = "%d:%f"
+	fmt2 = "%d:%d:%f"
+
+	case str.count(":")
+	when 0
+		fmt = fmt0
+	when 1
+		fmt = fmt1
+	when 2
+		fmt = fmt2
+	else
+		print "error"
+		exit 1
+	end
+
+	return str.sscanf(fmt)
+end
+
+class Segment
+	attr_accessor :start_t
+	attr_accessor :end_t
+	
+	def initialize(start_str, end_str)
+		ts = cvt_time(start_str)
+		ets = cvt_time(end_str)
+		
+		@start_t = ts.reverse.map.with_index {|x, i| x * (60 ** i)}.sum
+		@end_t = ets.reverse.map.with_index {|x, i| x * (60 ** i)}.sum
+	end
+end
 
 def chop(input1, time, dur, output="output.mkv")
-chop_cmd = "ffmpeg -y -threads 24 -i #{input1} -ss #{time} -to #{dur} -c:v copy -c:a copy #{output}.mkv"	
+chop_cmd = "ffmpeg -y -threads 16 -i #{input1} -ss #{time} -to #{dur} -c:v copy -c:a copy #{output}.mkv"	
 	system(chop_cmd)
 end
 
+def chop_multi(video, segments, output_path)
+filter = segments.map.with_index { |s, i| 
+	"[0:v] trim=#{s.start_t}:end=#{s.end_t}, setpts=PTS-STARTPTS [v#{i}];" \
+	"[0:a] atrim=#{s.start_t}:end=#{s.end_t},asetpts=PTS-STARTPTS [a#{i}];"
+}
+maps = segments.map.with_index {|s, i| "-map [v#{i}] -map [a#{i}] #{output_path}/#{i}.mkv"}.join(" ")
+chop_cmd = "ffmpeg -y -threads 4 -i #{video} " \
+	"-filter_complex '#{filter.join(" ")}'"
+chop_cmd = [chop_cmd, maps].join(" ")
+system(chop_cmd)
+end
+
 #need to make different commands for nvidia and x264
 def vstack(input1, input2, output="output.mkv")
 vstack_cmd = "ffmpeg -y " \
-	"-threads 24 " \
+	"-threads 16 " \
     "-init_hw_device vaapi=foo:/dev/dri/renderD128 " \
     "-hwaccel vaapi " \
     "-hwaccel_output_format vaapi " \
@@ -57,12 +103,16 @@ def chop_video(path)
 
 	time = "00:00:00"
 
+	segments = []
+
 	`mkdir -p clips`
 
 	splits.each do |split|
-		chop(video_file_path, time, split['time'], "clips/#{split['title'].split(" ").join("_").downcase}")
+		segments << Segment.new(time, split['time'])
 		time = split['time']
 	end
+
+	chop_multi(video_file_path, segments, Dir["#{path}/clips"][0])
 end
 
 =begin
@@ -87,13 +137,15 @@ end
 	concatenate clips into final video
 =end
 def cat_video()
-	entries = Dir["output/*"].map { |entry| "file #{entry}\n" }.join
+	entries = Dir["output/*"]
+
+	file = File.open("list.txt", "r+")
 
-	File.open("list.txt", "w") do |file|
-		file.write entries
+	for i in 0..entries.count - 1 do
+		file.write("file output/#{i}.mkv\n")
 	end
 
-	`ffmpeg -f concat -i list.txt -c copy output.mkv`
+	`ffmpeg -y -f concat -i list.txt -c copy output.mkv`
 end
 
 def concatenate_video(p1, p2)