diff --git a/AiServer.ServiceInterface/Generation/ComfyProvider.cs b/AiServer.ServiceInterface/Generation/ComfyProvider.cs
index 057c00e..c24d9f4 100644
--- a/AiServer.ServiceInterface/Generation/ComfyProvider.cs
+++ b/AiServer.ServiceInterface/Generation/ComfyProvider.cs
@@ -232,7 +232,7 @@ public async Task<TransformResult> TransformMediaAsync(MediaProvider provider, M
         // Handle cropping
         if (args is { CropX: not null, CropY: not null, CropWidth: not null, CropHeight: not null })
         {
-            filterComplex.Add($"crop={args.CropWidth}:{args.CropHeight}:{args.CropX}:{args.CropY}");
+            filterComplex.Add($"[0:v]crop={args.CropWidth}:{args.CropHeight}:{args.CropX}:{args.CropY}");
         }
 
         if (args is { WatermarkInput: not null, WatermarkPosition: not null })