From 7424292435abe3a1afcadbc37d2855f78d73d611 Mon Sep 17 00:00:00 2001
From: Vitaly Gashkov <vitalygashkov@vk.com>
Date: Wed, 20 Nov 2024 22:41:55 +0500
Subject: [PATCH] fix: improve audio filter when no language is selected

---
 lib/track.js | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/lib/track.js b/lib/track.js
index 2bfa3be..587cb73 100644
--- a/lib/track.js
+++ b/lib/track.js
@@ -46,9 +46,15 @@ const createAudioCodecFilter = (audios) => createCodecFilter(audios);
 const createAudioLanguageFilter = (audios) => {
   return (languages = [], maxTracksPerLanguage) => {
     if (!languages.length) {
-      for (const audio of audios) {
-        const alreadyAdded = languages.includes(audio.language);
-        if (!alreadyAdded) languages.push(audio.language);
+      const audiosWithLanguage = audios.filter((track) => track.language);
+      if (audiosWithLanguage.length) {
+        for (const audio of audiosWithLanguage) {
+          const alreadyAdded = languages.includes(audio.language);
+          if (!alreadyAdded) languages.push(audio.language);
+        }
+      } else {
+        audios.sort((a, b) => b.bitrate.bps - a.bitrate.bps);
+        return audios.slice(0, maxTracksPerLanguage);
       }
     }
     const filtered = [];