Fix: Use correct attribute name for video-to-video detection

videogen.py

@@ -7948,7 +7948,7 @@ def main(args):
     model_id = m_info["id"]
     is_i2v_mode = args.image_to_video or args.image
     is_i2i_mode = args.image_to_image
-    is_v2v_mode = args.input_video is not None
+    is_v2v_mode = getattr(args, 'video_to_video', False) or getattr(args, 'input_video', None) is not None
     
     if is_i2v_mode:
         task_type = "i2v"