fix batch processing error

backend/engine.py

@@ -123,7 +123,17 @@ def run(model, video_path, line, config, on_frame, save_annotated=False, annotat
     a = line[0]
     b = line[1]
 
-    for frame_idx, r in enumerate(results):
+    iterator = iter(enumerate(results))
+    while True:
+        try:
+            frame_idx, r = next(iterator)
+        except StopIteration:
+            break
+        except RuntimeError as e:
+            if "incompatible" in str(e) and "shape=" in str(e):
+                print(f"[BACKEND] Ignored OpenVINO shape mismatch on final trailing batch.")
+                break
+            raise e
         active = 0
         cur_boxes = None
         cur_ids = None