only keep sync pipeline

src/orisys/sensor.py

@@ -514,7 +514,20 @@ class Sensor:
 
     def _open_video_source(self, override, box):
         """Initialize video capture and calibration."""
-        self.cap = cv2.VideoCapture(self.vid_src)
+        # Use DirectShow backend on Windows for cameras (more stable than MSMF)
+        if isinstance(self.vid_src, int):
+            # For camera indices, try DirectShow first (avoids MSMF errors)
+            try:
+                self.cap = cv2.VideoCapture(self.vid_src, cv2.CAP_DSHOW)
+            except:
+                # Fallback to default backend
+                self.cap = cv2.VideoCapture(self.vid_src)
+        else:
+            # For file paths, use default backend
+            self.cap = cv2.VideoCapture(self.vid_src)
+        
+        # Set buffer size to 1 to reduce latency and avoid frame accumulation
+        self.cap.set(cv2.CAP_PROP_BUFFERSIZE, 1)
         self.cap.set(cv2.CAP_PROP_FOURCC, cv2.VideoWriter.fourcc('M', 'J', 'P', 'G'))
         self.cap.set(cv2.CAP_PROP_FPS, self._config_fps)
         self.cap.set(cv2.CAP_PROP_FRAME_WIDTH, self._config_resolution_raw[0])