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MediaBrowser.Model/Dlna/StreamBuilder.cs

@@ -407,10 +407,9 @@ namespace MediaBrowser.Model.Dlna
                         continue;
                     }
 
-                    var formatStr = format.ToString();
-                    if (directPlayProfile.SupportsContainer(formatStr))
+                    if (directPlayProfile.SupportsContainer(format))
                     {
-                        return formatStr;
+                        return format;
                     }
                 }
             }
@@ -1317,6 +1316,7 @@ namespace MediaBrowser.Model.Dlna
             }
 
             var containerSupported = false;
+            TranscodeReason[] rankings = [TranscodeReason.VideoCodecNotSupported, VideoCodecReasons, TranscodeReason.AudioCodecNotSupported, AudioCodecReasons, ContainerReasons];
 
             // Check DirectPlay profiles to see if it can be direct played
             var analyzedProfiles = profile.DirectPlayProfiles
@@ -1382,7 +1382,6 @@ namespace MediaBrowser.Model.Dlna
                         playMethod = PlayMethod.DirectStream;
                     }
 
-                    TranscodeReason[] rankings = [TranscodeReason.VideoCodecNotSupported, VideoCodecReasons, TranscodeReason.AudioCodecNotSupported, AudioCodecReasons, ContainerReasons];
                     var ranked = GetRank(ref failureReasons, rankings);
 
                     return (Result: (Profile: directPlayProfile, PlayMethod: playMethod, AudioStreamIndex: selectedAudioStream?.Index, TranscodeReason: failureReasons), Order: order, Rank: ranked);

MediaBrowser.Model/Extensions/ContainerHelper.cs

@@ -91,7 +91,7 @@ public static class ContainerHelper
             {
                 foreach (var profile in allProfileContainers)
                 {
-                    if (container.Equals(profile, StringComparison.OrdinalIgnoreCase))
+                    if (!profile.IsEmpty && container.Equals(profile, StringComparison.OrdinalIgnoreCase))
                     {
                         return !isNegativeList;
                     }
@@ -118,7 +118,7 @@ public static class ContainerHelper
             return true;
         }
 
-        var allInputContainers = inputContainer.Split(',');
+        var allInputContainers = Split(inputContainer);
         foreach (var container in allInputContainers)
         {
             foreach (var profile in profileContainers)

tests/Jellyfin.Model.Tests/Dlna/ContainerHelperTests.cs

@@ -40,6 +40,11 @@ public class ContainerHelperTests
     public void ContainsContainer_NotInList_ReturnsFalse(string container, string? extension)
     {
         Assert.False(ContainerHelper.ContainsContainer(container, extension));
+
+        if (extension is not null)
+        {
+            Assert.False(ContainerHelper.ContainsContainer(container, extension.AsSpan()));
+        }
     }
 
     [Theory]
@@ -51,4 +56,28 @@ public class ContainerHelperTests
     {
         Assert.True(ContainerHelper.ContainsContainer(container, extension.AsSpan()));
     }
+
+    [Theory]
+    [InlineData(new string[] { "mp3", "mpeg" }, false, "mpeg")]
+    [InlineData(new string[] { "mp3", "mpeg", "avi" }, false, "avi")]
+    [InlineData(new string[] { "mp3", "", "avi" }, false, "mp3")]
+    [InlineData(new string[] { "mp3", "mpeg" }, true, "avi")]
+    [InlineData(new string[] { "mp3", "mpeg", "avi" }, true, "mkv")]
+    [InlineData(new string[] { "mp3", "", "avi" }, true, "")]
+    public void ContainsContainer_ThreeArgs_InList_ReturnsTrue(string[] containers, bool isNegativeList, string inputContainer)
+    {
+        Assert.True(ContainerHelper.ContainsContainer(containers, isNegativeList, inputContainer));
+    }
+
+    [Theory]
+    [InlineData(new string[] { "mp3", "mpeg" }, false, "avi")]
+    [InlineData(new string[] { "mp3", "mpeg", "avi" }, false, "mkv")]
+    [InlineData(new string[] { "mp3", "", "avi" }, false, "")]
+    [InlineData(new string[] { "mp3", "mpeg" }, true, "mpeg")]
+    [InlineData(new string[] { "mp3", "mpeg", "avi" }, true, "mp3")]
+    [InlineData(new string[] { "mp3", "", "avi" }, true, "avi")]
+    public void ContainsContainer_ThreeArgs_InList_ReturnsFalse(string[] containers, bool isNegativeList, string inputContainer)
+    {
+        Assert.False(ContainerHelper.ContainsContainer(containers, isNegativeList, inputContainer));
+    }
 }