diff --git a/FFMpegCore/FFMpeg/FFMpeg.cs b/FFMpegCore/FFMpeg/FFMpeg.cs
index ed3d390..13563ce 100644
--- a/FFMpegCore/FFMpeg/FFMpeg.cs
+++ b/FFMpegCore/FFMpeg/FFMpeg.cs
@@ -116,12 +116,9 @@ private static (FFMpegArguments, Action<FFMpegArgumentOptions> outputOptions) Bu
         {
             captureTime ??= TimeSpan.FromSeconds(source.Duration.TotalSeconds / 3);
             size = PrepareSnapshotSize(source, size);
-            if (streamIndex == null)
-            {
-                streamIndex = source.PrimaryVideoStream?.Index
-                    ?? source.VideoStreams.First()?.Index
-                    ?? 0;
-            }
+            streamIndex ??= source.PrimaryVideoStream?.Index
+                            ?? source.VideoStreams.FirstOrDefault()?.Index
+                            ?? 0;
 
             return (FFMpegArguments
                 .FromFileInput(input, false, options => options