From 66b3e959bd082d74606d7c613c3765d2ed2fba94 Mon Sep 17 00:00:00 2001
From: Esa Kataja <ekataja@gmail.com>
Date: Sat, 23 Aug 2025 00:06:42 +0300
Subject: [PATCH] feat: set default disposition flag for English audio streams
 and disable for others

---
 src/commandBuilder.ts | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/commandBuilder.ts b/src/commandBuilder.ts
index c88b27f..c83529c 100644
--- a/src/commandBuilder.ts
+++ b/src/commandBuilder.ts
@@ -97,8 +97,19 @@ export function encodingCommandBuilder(videoInfo: parsedVideoInfo): string {
     }
     args.push(
       `-metadata:s:a:${index}`,
-      `language=${audioStream.language} \\\n`,
+      `language=${audioStream.language}`,
     );
+    if (audioStream.language === "eng") {
+      args.push(
+        `-disposition:a:${index}`,
+        `default \\\n`,
+      );
+    } else {
+      args.push(
+        `-disposition:a:${index}`,
+        `-1 \\\n`,
+      );
+    }
   }
 
   for (