1 files changed, 9 insertions, 0 deletions
diff --git a/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs b/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs
index dac2c6a26..102b4f943 100644
--- a/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs
+++ b/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs
@@ -548,6 +548,15 @@ namespace MediaBrowser.MediaEncoding.Encoder
                 throw new ArgumentNullException(nameof(inputPath));
             }
 
+            if (string.IsNullOrEmpty(outputExtension))
+            {
+                outputExtension = ".jpg";
+            }
+            else if (outputExtension[0] != '.')
+            {
+                outputExtension = "." + outputExtension;
+            }
+
             var tempExtractPath = Path.Combine(_configurationManager.ApplicationPaths.TempDirectory, Guid.NewGuid() + outputExtension);
             Directory.CreateDirectory(Path.GetDirectoryName(tempExtractPath));