diff --git a/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs b/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs
index 4c804371ed..fbd08a97c7 100644
--- a/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs
+++ b/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs
@@ -605,9 +605,9 @@ namespace MediaBrowser.MediaEncoding.Encoder
             // Use ffmpeg to sample 100 (we can drop this if required using thumbnail=50 for 50 frames) frames and pick the best thumbnail. Have a fall back just in case.
             // mpegts need larger batch size otherwise the corrupted thumbnail will be created. Larger batch size will lower the processing speed.
             var enableThumbnail = useIFrame && !string.Equals("wtv", container, StringComparison.OrdinalIgnoreCase);
-            var useLargerBatchSize = string.Equals("mpegts", container, StringComparison.OrdinalIgnoreCase);
             if (enableThumbnail)
             {
+                var useLargerBatchSize = string.Equals("mpegts", container, StringComparison.OrdinalIgnoreCase);
                 var batchSize = useLargerBatchSize ? "50" : "24";
                 if (string.IsNullOrEmpty(vf))
                 {