Return null on division by zero

MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs

@@ -1052,7 +1052,7 @@ namespace MediaBrowser.MediaEncoding.Probing
                 return null;
             }
 
-            return divisor == 0f ? 0f : dividend / divisor;
+            return divisor == 0f ? null : dividend / divisor;
         }
 
         private void SetAudioRuntimeTicks(InternalMediaInfoResult result, MediaInfo data)

tests/Jellyfin.MediaEncoding.Tests/Probing/ProbeResultNormalizerTests.cs

@@ -24,7 +24,7 @@ namespace Jellyfin.MediaEncoding.Tests.Probing
         [InlineData("25/1", 25f)]
         [InlineData("120/1", 120f)]
         [InlineData("1704753000/71073479", 23.98578237601117f)]
-        [InlineData("0/0", 0f)]
+        [InlineData("0/0", null)]
         [InlineData("1/1000", 0.001f)]
         [InlineData("1/90000", 1.1111111E-05f)]
         [InlineData("1/48000", 2.0833333E-05f)]