1 files changed, 6 insertions, 0 deletions
diff --git a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
index 09080e7b2..92b9a8c7e 100644
--- a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
+++ b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
@@ -313,6 +313,12 @@ namespace MediaBrowser.Controller.MediaEncoding
                 return null;
             }
 
+            // ISO files don't have an ffmpeg format
+            if (string.Equals(container, "iso", StringComparison.OrdinalIgnoreCase))
+            {
+                return null;
+            }
+
             return container;
         }