saving status before scene frame fix after rust change

cht/stream/manager.py

@@ -178,10 +178,16 @@ class StreamManager:
         self.processor.set_on_new_frames(on_new_frames)
         if self.recorder:
             self.recorder.capture_now(on_raw_frame=self.processor.on_captured_frame)
+        else:
+            # Rust mode: extract current frame directly from the growing fMP4.
+            self.processor.capture_now_from_file()
 
     def update_scene_threshold(self, new_threshold: float):
         if self.recorder:
             self.recorder.update_scene_threshold(new_threshold)
+        else:
+            # Rust mode: restart scene detector with new threshold.
+            self.processor.restart_scene_detector(threshold=new_threshold)
 
     # -- Processor delegation --