diff --git a/tests/Jellyfin.Model.Tests/Dlna/StreamBuilderTests.cs b/tests/Jellyfin.Model.Tests/Dlna/StreamBuilderTests.cs
index 210ce4a47f..56c2c554da 100644
--- a/tests/Jellyfin.Model.Tests/Dlna/StreamBuilderTests.cs
+++ b/tests/Jellyfin.Model.Tests/Dlna/StreamBuilderTests.cs
@@ -27,7 +27,7 @@ namespace Jellyfin.Model.Tests
         [InlineData("Chrome", "mp4-h264-ac3-srt-2600k", PlayMethod.DirectStream, TranscodeReason.AudioCodecNotSupported)] // #6450
         [InlineData("Chrome", "mp4-hevc-aac-srt-15200k", PlayMethod.Transcode, TranscodeReason.VideoCodecNotSupported, "Transcode")]
         [InlineData("Chrome", "mp4-hevc-ac3-aac-srt-15200k", PlayMethod.Transcode, TranscodeReason.VideoCodecNotSupported | TranscodeReason.SecondaryAudioNotSupported, "Transcode")]
-        [InlineData("Chrome", "mkv-vp9-aac-srt-2600k", PlayMethod.DirectStream, TranscodeReason.ContainerNotSupported)] // #6450
+        [InlineData("Chrome", "mkv-vp9-aac-srt-2600k", PlayMethod.DirectStream, TranscodeReason.ContainerNotSupported, "Remux")] // #6450
         [InlineData("Chrome", "mkv-vp9-ac3-srt-2600k", PlayMethod.DirectStream, TranscodeReason.AudioCodecNotSupported)] // #6450
         [InlineData("Chrome", "mkv-vp9-vorbis-vtt-2600k", PlayMethod.DirectPlay, (TranscodeReason)0, "Remux")] // #6450
         // Firefox
@@ -38,7 +38,7 @@ namespace Jellyfin.Model.Tests
         [InlineData("Firefox", "mp4-h264-ac3-srt-2600k", PlayMethod.DirectStream, TranscodeReason.AudioCodecNotSupported)] // #6450
         [InlineData("Firefox", "mp4-hevc-aac-srt-15200k", PlayMethod.Transcode, TranscodeReason.VideoCodecNotSupported, "Transcode")]
         [InlineData("Firefox", "mp4-hevc-ac3-aac-srt-15200k", PlayMethod.Transcode, TranscodeReason.VideoCodecNotSupported | TranscodeReason.SecondaryAudioNotSupported, "Transcode")]
-        [InlineData("Firefox", "mkv-vp9-aac-srt-2600k", PlayMethod.DirectStream, TranscodeReason.ContainerNotSupported)] // #6450
+        [InlineData("Firefox", "mkv-vp9-aac-srt-2600k", PlayMethod.DirectStream, TranscodeReason.ContainerNotSupported, "Remux")] // #6450
         [InlineData("Firefox", "mkv-vp9-ac3-srt-2600k", PlayMethod.DirectStream, TranscodeReason.AudioCodecNotSupported)] // #6450
         [InlineData("Firefox", "mkv-vp9-vorbis-vtt-2600k", PlayMethod.DirectPlay, (TranscodeReason)0, "Remux")] // #6450
         // Safari
@@ -89,7 +89,7 @@ namespace Jellyfin.Model.Tests
         [InlineData("Chrome-NoHLS", "mp4-h264-ac3-srt-2600k", PlayMethod.DirectStream, TranscodeReason.AudioCodecNotSupported)] // #6450
         [InlineData("Chrome-NoHLS", "mp4-hevc-aac-srt-15200k", PlayMethod.Transcode, TranscodeReason.VideoCodecNotSupported, "Transcode", "http")]
         [InlineData("Chrome-NoHLS", "mp4-hevc-ac3-aac-srt-15200k", PlayMethod.Transcode, TranscodeReason.VideoCodecNotSupported | TranscodeReason.SecondaryAudioNotSupported, "Transcode", "http")]
-        [InlineData("Chrome-NoHLS", "mkv-vp9-aac-srt-2600k", PlayMethod.DirectStream, TranscodeReason.ContainerNotSupported)] // #6450
+        [InlineData("Chrome-NoHLS", "mkv-vp9-aac-srt-2600k", PlayMethod.DirectStream, TranscodeReason.ContainerNotSupported, "Remux")] // #6450
         [InlineData("Chrome-NoHLS", "mkv-vp9-ac3-srt-2600k", PlayMethod.DirectStream, TranscodeReason.AudioCodecNotSupported)] // #6450
         [InlineData("Chrome-NoHLS", "mkv-vp9-vorbis-vtt-2600k", PlayMethod.DirectPlay, (TranscodeReason)0, "Remux")] // #6450
         // TranscodeMedia
@@ -177,7 +177,7 @@ namespace Jellyfin.Model.Tests
         [InlineData("Chrome", "mp4-h264-ac3-srt-2600k", PlayMethod.DirectStream, TranscodeReason.AudioCodecNotSupported)] // #6450
         [InlineData("Chrome", "mp4-hevc-aac-srt-15200k", PlayMethod.Transcode, TranscodeReason.VideoCodecNotSupported, "Transcode")]
         [InlineData("Chrome", "mp4-hevc-ac3-aac-srt-15200k", PlayMethod.Transcode, TranscodeReason.VideoCodecNotSupported | TranscodeReason.AudioCodecNotSupported, "Transcode")]
-        [InlineData("Chrome", "mkv-vp9-aac-srt-2600k", PlayMethod.DirectStream, TranscodeReason.ContainerNotSupported)] // #6450
+        [InlineData("Chrome", "mkv-vp9-aac-srt-2600k", PlayMethod.DirectStream, TranscodeReason.ContainerNotSupported, "Remux")] // #6450
         [InlineData("Chrome", "mkv-vp9-ac3-srt-2600k", PlayMethod.DirectStream, TranscodeReason.AudioCodecNotSupported)] // #6450
         [InlineData("Chrome", "mkv-vp9-vorbis-vtt-2600k", PlayMethod.DirectPlay, (TranscodeReason)0, "Remux")] // #6450
         // Firefox
@@ -187,7 +187,7 @@ namespace Jellyfin.Model.Tests
         [InlineData("Firefox", "mp4-h264-ac3-srt-2600k", PlayMethod.DirectStream, TranscodeReason.AudioCodecNotSupported)] // #6450
         [InlineData("Firefox", "mp4-hevc-aac-srt-15200k", PlayMethod.Transcode, TranscodeReason.VideoCodecNotSupported, "Transcode")]
         [InlineData("Firefox", "mp4-hevc-ac3-aac-srt-15200k", PlayMethod.Transcode, TranscodeReason.VideoCodecNotSupported | TranscodeReason.AudioCodecNotSupported, "Transcode")]
-        [InlineData("Firefox", "mkv-vp9-aac-srt-2600k", PlayMethod.DirectStream, TranscodeReason.ContainerNotSupported)] // #6450
+        [InlineData("Firefox", "mkv-vp9-aac-srt-2600k", PlayMethod.DirectStream, TranscodeReason.ContainerNotSupported, "Remux")] // #6450
         [InlineData("Firefox", "mkv-vp9-ac3-srt-2600k", PlayMethod.DirectStream, TranscodeReason.AudioCodecNotSupported)] // #6450
         [InlineData("Firefox", "mkv-vp9-vorbis-vtt-2600k", PlayMethod.DirectPlay, (TranscodeReason)0, "Remux")] // #6450
         // Safari
@@ -419,14 +419,7 @@ namespace Jellyfin.Model.Tests
                         if (targetAudioStream?.IsExternal == false)
                         {
                             // Check expected audio codecs (1)
-                            if (streamInfo.TranscodeReasons.HasFlag(TranscodeReason.ContainerNotSupported))
-                            {
-                                Assert.Contains(targetAudioStream.Codec, streamInfo.AudioCodecs);
-                            }
-                            else
-                            {
-                                Assert.DoesNotContain(targetAudioStream.Codec, streamInfo.AudioCodecs);
-                            }
+                            Assert.DoesNotContain(targetAudioStream.Codec, streamInfo.AudioCodecs);
                         }
                     }
                     else if (transcodeMode.Equals("Remux", StringComparison.Ordinal))