From 8851ace5436c6a22b9489f88d20e1aab582ffddf Mon Sep 17 00:00:00 2001
From: gnattu <gnattu@users.noreply.github.com>
Date: Thu, 18 Jul 2024 00:35:40 +0800
Subject: [PATCH] Enable Dolby AC-4 decoder (#11486)

---
 Jellyfin.Api/Controllers/DynamicHlsController.cs       | 7 +++++++
 MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs | 1 +
 2 files changed, 8 insertions(+)

diff --git a/Jellyfin.Api/Controllers/DynamicHlsController.cs b/Jellyfin.Api/Controllers/DynamicHlsController.cs
index 68602c80d5..2201225a8a 100644
--- a/Jellyfin.Api/Controllers/DynamicHlsController.cs
+++ b/Jellyfin.Api/Controllers/DynamicHlsController.cs
@@ -1735,6 +1735,13 @@ public class DynamicHlsController : BaseJellyfinApiController
             }
         }
 
+        if (state.AudioStream is not null && state.AudioStream.CodecTag.Equals("ac-4", StringComparison.Ordinal))
+        {
+            // ac-4 audio tends to hava a super weird sample rate that will fail most encoders
+            // force resample it to 48KHz
+            args += " -ar 48000";
+        }
+
         if (state.OutputAudioSampleRate.HasValue)
         {
             args += " -ar " + state.OutputAudioSampleRate.Value.ToString(CultureInfo.InvariantCulture);
diff --git a/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs b/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs
index 30bb21dcb1..06e2d37830 100644
--- a/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs
+++ b/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs
@@ -27,6 +27,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
             "msmpeg4",
             "dca",
             "ac3",
+            "ac4",
             "aac",
             "mp3",
             "flac",