From 993a885a3ee78fcce265b43a27d8ff6b24609505 Mon Sep 17 00:00:00 2001
From: wukko <me@wukko.me>
Date: Fri, 20 Jun 2025 16:20:32 +0600
Subject: [PATCH] web/util: add support for subtitle track language metadata

---
 web/src/lib/types/api.ts | 3 ++-
 web/src/lib/util.ts      | 7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/web/src/lib/types/api.ts b/web/src/lib/types/api.ts
index 13d2b8b7..c34acc16 100644
--- a/web/src/lib/types/api.ts
+++ b/web/src/lib/types/api.ts
@@ -52,7 +52,8 @@ export const CobaltFileMetadataKeys = [
     'artist',
     'album_artist',
     'track',
-    'date'
+    'date',
+    'sublanguage',
 ];
 
 export type CobaltFileMetadata = Record<
diff --git a/web/src/lib/util.ts b/web/src/lib/util.ts
index f3f33f6e..4e833166 100644
--- a/web/src/lib/util.ts
+++ b/web/src/lib/util.ts
@@ -18,6 +18,13 @@ export const formatFileSize = (size: number | undefined) => {
 export const ffmpegMetadataArgs = (metadata: CobaltFileMetadata) =>
     Object.entries(metadata).flatMap(([name, value]) => {
         if (CobaltFileMetadataKeys.includes(name) && typeof value === "string") {
+            if (name === "sublanguage") {
+                return [
+                    '-metadata:s:s:0',
+                    // eslint-disable-next-line no-control-regex
+                    `language=${value.replace(/[\u0000-\u0009]/g, "")}`
+                ]
+            }
             return [
                 '-metadata',
                 // eslint-disable-next-line no-control-regex