fix fps

Extract_HaMeR_Single.py

@@ -96,6 +96,7 @@ def main(args, model, renderer, device):
             print(f"Total Time for Video to Image: {(time.time()-start_time)} Seconds")
         else:
             image_folder = Path(args.img_folder)
+            fps = None
         # Get all demo images ends with .jpg or .png
         img_paths = [img for end in args.file_type for img in image_folder.glob(end)]