Can now do dash encodings and handles 2 passes or 1 pass dash. Also doesn't do the ffmpeg log if it's only one pass.

config.json

@@ -7,14 +7,60 @@
   "AudioBitrate": 192,
   "VideoCodec": "libvpx-vp9",
   "CleanFilename": false,
-  "CRF": 20,
+  "CRF": 30,
   "FPS": 30,
-  "Tune": "animation",
+  "Input": "test_video.mp4",
-  "Input": "LGo*.mp4",
   "OutDir": "dash_test",
-  "Passes": 1,
+  "Passes": 2,
+  "Extras": [
+    "-row-mt", "1",
+    "-cpu-used", "8",
+    "-g", "150",
+    "-keyint_min", "150",
+    "-tile-columns", "4",
+    "-tile-rows", "2",
+    "-frame-parallel", "1",
+    "-tune-content", "1"
+    ]
+  },
+  {
+  "Format": "webm",
+  "Scale": "1280:720",
+  "Resize": false,
+  "VideoBitrate": 600,
+  "AudioBitrate": 192,
+  "VideoCodec": "libvpx-vp9",
+  "CleanFilename": false,
+  "CRF": 30,
+  "FPS": 30,
+  "Input": "test_video.mp4",
+  "OutDir": "dash_test",
+  "Passes": 2,
+  "Extras": [
+    "-row-mt", "1",
+    "-cpu-used", "8",
+    "-g", "150",
+    "-keyint_min", "150",
+    "-tile-columns", "4",
+    "-tile-rows", "2",
+    "-frame-parallel", "1",
+    "-tune-content", "1"
+    ]
+  },
+  {
+  "Format": "webm",
+  "Scale": "640:360",
+  "Resize": false,
+  "VideoBitrate": 300,
+  "AudioBitrate": 192,
+  "VideoCodec": "libvpx-vp9",
+  "CleanFilename": false,
+  "CRF": 30,
+  "FPS": 30,
+  "Input": "test_video.mp4",
+  "OutDir": "dash_test",
+  "Passes": 2,
   "Extras": [
-    "-deadline", "realtime",
     "-row-mt", "1",
     "-cpu-used", "8",
     "-g", "150",

config/settings.go

@@ -17,6 +17,7 @@ type VideoOpts struct {
   AudioCodec string
   Preset string
   CleanFilename bool
+  Dash bool
   CRF int
   FPS int
   Tune string

main.go

@@ -31,8 +31,12 @@ func Run(encoding config.VideoOpts, pass int, pid int, input string, output stri
 
 	extras := []string{
 		"-pix_fmt", "yuv420p",
+	}
+
+	if encoding.Passes > 1 {
+		extras = append(extras, 
 			"-pass", fmt.Sprint(pass),
-		"-passlogfile", fmt.Sprintf("ffmpegpass-%x.log", pid),
+			"-passlogfile", fmt.Sprintf("ffmpegpass-%x.log", pid))
 	}
 
 	if encoding.Preset != "" {
@@ -45,7 +49,8 @@ func Run(encoding config.VideoOpts, pass int, pid int, input string, output stri
 		"-aspect", encoding.Scale)
 	}
 
-	if pass != encoding.Passes {
+	if pass != encoding.Passes || encoding.Dash {
+		// BUG: warn that dash removes audio
 		extras = append(extras, "-an")
 	} else {
 		encode.AudioCodec(encoding.AudioCodec)
@@ -53,6 +58,7 @@ func Run(encoding config.VideoOpts, pass int, pid int, input string, output stri
 		"-b:a", fmt.Sprint(encoding.AudioBitrate * 1024))
 	}
 
+
 	if encoding.Test > 0 {
 		encode.InputOptions("-ss", fmt.Sprintf("00:%d", encoding.TestStart))
 		extras = append(extras, "-t", fmt.Sprint(encoding.Test))
@@ -63,9 +69,16 @@ func Run(encoding config.VideoOpts, pass int, pid int, input string, output stri
 		FrameRate(encoding.FPS).
 		ConstantRateFactor(encoding.CRF)
 
+
 	extras = append(extras, encoding.Extras...)
+
+	if encoding.Dash {
+		extras = append(extras, "-dash", "1")
+	}
+
 	encode.OutputOptions(extras...)
 
+
 	cmd := encode.InputPath(input).
 		OutputFormat(encoding.Format).
 		OutputPath(output).