From 597a2ba7c14696fadd94ffdcac42c66ca81f9b6e Mon Sep 17 00:00:00 2001
From: "Zed A. Shaw" <zed.shaw@gmail.com>
Date: Mon, 17 Nov 2025 00:34:45 -0500
Subject: [PATCH] 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        | 56 +++++++++++++++++++++++++++++++++++++++++-----
 config/settings.go |  1 +
 main.go            | 35 ++++++++++++++++++++---------
 3 files changed, 76 insertions(+), 16 deletions(-)

diff --git a/config.json b/config.json
index 024ffab..db76945 100644
--- a/config.json
+++ b/config.json
@@ -7,14 +7,60 @@
   "AudioBitrate": 192,
   "VideoCodec": "libvpx-vp9",
   "CleanFilename": false,
-  "CRF": 20,
+  "CRF": 30,
   "FPS": 30,
-  "Tune": "animation",
-  "Input": "LGo*.mp4",
+  "Input": "test_video.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",
diff --git a/config/settings.go b/config/settings.go
index fdf8865..b62e1f9 100644
--- a/config/settings.go
+++ b/config/settings.go
@@ -17,6 +17,7 @@ type VideoOpts struct {
   AudioCodec string
   Preset string
   CleanFilename bool
+  Dash bool
   CRF int
   FPS int
   Tune string
diff --git a/main.go b/main.go
index 00f4110..7d486d7 100644
--- a/main.go
+++ b/main.go
@@ -31,8 +31,12 @@ func Run(encoding config.VideoOpts, pass int, pid int, input string, output stri
 
 	extras := []string{
 		"-pix_fmt", "yuv420p",
-		"-pass", fmt.Sprint(pass),
-		"-passlogfile", fmt.Sprintf("ffmpegpass-%x.log", pid),
+	}
+
+	if encoding.Passes > 1 {
+		extras = append(extras, 
+			"-pass", fmt.Sprint(pass),
+			"-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)
@@ -53,25 +58,33 @@ 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))
 	}
 
 	encode.VideoCodec(encoding.VideoCodec).
-	VideoBitRate(encoding.VideoBitrate * 1024).
-	FrameRate(encoding.FPS).
-	ConstantRateFactor(encoding.CRF)
+		VideoBitRate(encoding.VideoBitrate * 1024).
+		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).
-	OutputLogs(os.Stdout).
-	Overwrite(true).
-	Build()
+		OutputFormat(encoding.Format).
+		OutputPath(output).
+		OutputLogs(os.Stdout).
+		Overwrite(true).
+		Build()
 
 	fmt.Println(">", cmd.String())