diff --git a/main.go b/main.go
index bbd836d..e6f8bdb 100644
--- a/main.go
+++ b/main.go
@@ -6,16 +6,39 @@ import (
   "github.com/modfy/fluent-ffmpeg"
 )
 
+func Run(pass string) {
+  pid := 1
+  encode := fluentffmpeg.NewCommand("")
+
+  mp4_opts := []string{
+    "-vf", fmt.Sprintf("scale=%s:flags=lanczos", config.Settings.Scale),
+    "-aspect", config.Settings.Scale,
+    "-pix_fmt", "yuv420p",
+    "-tune", config.Settings.Tune,
+    "-movflags", "faststart",
+    "-pass", pass,
+    "-passlogfile", fmt.Sprintf("ffmpeg2pass-%d.log", pid),
+    "-preset", config.Settings.Speed,
+    "-filter:v", fmt.Sprintf("fps=%d", config.Settings.FPS),
+    "-crf", fmt.Sprint(config.Settings.CRF),
+  }
+
+  encode.Options(mp4_opts...)
+
+  cmd := encode.InputPath(config.Settings.Input).
+    OutputFormat("mp4").
+    OutputPath(config.Settings.Output).
+    Build()
+
+  fmt.Println("COMMAND", cmd.String())
+
+  err := cmd.Run()
+  if err != nil { panic("fail") }
+}
 
 func main() {
   config.Load()
   fmt.Println(config.Settings)
 
-  err := fluentffmpeg.NewCommand("").
-		InputPath(config.Settings.Input).
-		OutputFormat("mp4").
-		OutputPath(config.Settings.Output).
-		Run()
-
-  if err != nil { panic("fail") }
+  Run("1")
 }