From 029be321d1c951abdf79cfea038f50ec399fdfb9 Mon Sep 17 00:00:00 2001
From: Shadowghost <Ghost_of_Stone@web.de>
Date: Fri, 6 May 2022 23:18:45 +0200
Subject: [PATCH] Respect limited opus sampling rates when building trancoding
 command

---
 .../MediaEncoding/EncodingHelper.cs              | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
index 1851a9f0c5..54b41a6d25 100644
--- a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
+++ b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
@@ -5370,12 +5370,22 @@ namespace MediaBrowser.Controller.MediaEncoding
                 audioTranscodeParams.Add("-ac " + state.OutputAudioChannels.Value.ToString(CultureInfo.InvariantCulture));
             }
 
-            // opus will fail on 44100
             if (!string.Equals(state.OutputAudioCodec, "opus", StringComparison.OrdinalIgnoreCase))
             {
-                if (state.OutputAudioSampleRate.HasValue)
+                // opus only supports specific sampling rates
+                var sampleRate = state.OutputAudioSampleRate;
+                if (sampleRate.HasValue)
                 {
-                    audioTranscodeParams.Add("-ar " + state.OutputAudioSampleRate.Value.ToString(CultureInfo.InvariantCulture));
+                    var sampleRateValue = sampleRate.Value switch
+                    {
+                        <= 8000 => 8000,
+                        <= 12000 => 12000,
+                        <= 16000 => 16000,
+                        <= 24000 => 24000,
+                        _ => 48000
+                    };
+
+                    audioTranscodeParams.Add("-ar " + sampleRateValue.ToString(CultureInfo.InvariantCulture));
                 }
             }