From 78f750a3e81ca5ae8bcb4532e595f791cdefc29d Mon Sep 17 00:00:00 2001
From: "Zed A. Shaw" <zed.shaw@gmail.com>
Date: Mon, 17 Nov 2025 01:05:32 -0500
Subject: [PATCH] Can now generate all versions of a target video with no audio
 then separate out the audio for dash.

---
 config.json | 30 ++++++++++++++++++++++++------
 main.go     | 28 +++++++++++++++++-----------
 2 files changed, 41 insertions(+), 17 deletions(-)

diff --git a/config.json b/config.json
index db76945..61b3213 100644
--- a/config.json
+++ b/config.json
@@ -4,15 +4,17 @@
   "Scale": "1920:1080",
   "Resize": false,
   "VideoBitrate": 900,
-  "AudioBitrate": 192,
+  "AudioCodec": "none",
   "VideoCodec": "libvpx-vp9",
   "CleanFilename": false,
   "CRF": 30,
   "FPS": 30,
   "Input": "test_video.mp4",
   "OutDir": "dash_test",
-  "Passes": 2,
+  "Passes": 1,
+  "Dash": true,
   "Extras": [
+    "-deadline", "realtime",
     "-row-mt", "1",
     "-cpu-used", "8",
     "-g", "150",
@@ -28,15 +30,17 @@
   "Scale": "1280:720",
   "Resize": false,
   "VideoBitrate": 600,
-  "AudioBitrate": 192,
+  "AudioCodec": "none",
   "VideoCodec": "libvpx-vp9",
   "CleanFilename": false,
   "CRF": 30,
   "FPS": 30,
   "Input": "test_video.mp4",
   "OutDir": "dash_test",
-  "Passes": 2,
+  "Passes": 1,
+  "Dash": true,
   "Extras": [
+    "-deadline", "realtime",
     "-row-mt", "1",
     "-cpu-used", "8",
     "-g", "150",
@@ -52,15 +56,17 @@
   "Scale": "640:360",
   "Resize": false,
   "VideoBitrate": 300,
-  "AudioBitrate": 192,
+  "AudioCodec": "none",
   "VideoCodec": "libvpx-vp9",
   "CleanFilename": false,
   "CRF": 30,
   "FPS": 30,
   "Input": "test_video.mp4",
   "OutDir": "dash_test",
-  "Passes": 2,
+  "Passes": 1,
+  "Dash": true,
   "Extras": [
+    "-deadline", "realtime",
     "-row-mt", "1",
     "-cpu-used", "8",
     "-g", "150",
@@ -70,5 +76,17 @@
     "-frame-parallel", "1",
     "-tune-content", "1"
     ]
+  },
+  {
+  "Format": "webm",
+  "AudioBitrate": 192,
+  "AudioCodec": "libopus",
+  "VideoCodec": "none",
+  "CleanFilename": false,
+  "CRF": 30,
+  "FPS": 30,
+  "Input": "test_video.mp4",
+  "OutDir": "dash_test",
+  "Passes": 1
   }
 ]
diff --git a/main.go b/main.go
index 7d486d7..2c3687a 100644
--- a/main.go
+++ b/main.go
@@ -21,9 +21,14 @@ func ModFile(fname string, encoding config.VideoOpts) string {
 	base, found := strings.CutSuffix(file, ext)
 	if !found { panic("no extension found?!") }
 
-	dim := strings.Replace(encoding.Scale, ":", ".", 1)
-	renamed := fmt.Sprint(base, ".", dim, ".", encoding.Format)
-	return filepath.Join(dir, renamed)
+	if encoding.Scale == "" && encoding.VideoCodec == "none" {
+		renamed := fmt.Sprint(base, ".audio.", encoding.Format)
+		return filepath.Join(dir, renamed)
+	} else {
+		dim := strings.Replace(encoding.Scale, ":", ".", 1)
+		renamed := fmt.Sprint(base, ".", dim, ".", encoding.Format)
+		return filepath.Join(dir, renamed)
+	}
 }
 
 func Run(encoding config.VideoOpts, pass int, pid int, input string, output string) {
@@ -49,8 +54,7 @@ func Run(encoding config.VideoOpts, pass int, pid int, input string, output stri
 		"-aspect", encoding.Scale)
 	}
 
-	if pass != encoding.Passes || encoding.Dash {
-		// BUG: warn that dash removes audio
+	if pass != encoding.Passes || encoding.AudioCodec == "none" {
 		extras = append(extras, "-an")
 	} else {
 		encode.AudioCodec(encoding.AudioCodec)
@@ -64,11 +68,14 @@ func Run(encoding config.VideoOpts, pass int, pid int, input string, output stri
 		extras = append(extras, "-t", fmt.Sprint(encoding.Test))
 	}
 
-	encode.VideoCodec(encoding.VideoCodec).
-		VideoBitRate(encoding.VideoBitrate * 1024).
-		FrameRate(encoding.FPS).
-		ConstantRateFactor(encoding.CRF)
-
+	if encoding.VideoCodec == "none" {
+		extras = append(extras, "-vn")
+	} else {
+		encode.VideoCodec(encoding.VideoCodec).
+			VideoBitRate(encoding.VideoBitrate * 1024).
+			FrameRate(encoding.FPS).
+			ConstantRateFactor(encoding.CRF)
+	}
 
 	extras = append(extras, encoding.Extras...)
 
@@ -78,7 +85,6 @@ func Run(encoding config.VideoOpts, pass int, pid int, input string, output stri
 
 	encode.OutputOptions(extras...)
 
-
 	cmd := encode.InputPath(input).
 		OutputFormat(encoding.Format).
 		OutputPath(output).