refactor: only publish if frame changed + allow path to change show_stats

app.py

@@ -84,7 +84,9 @@ def stream_mjpeg(session_id: str):
 
     if session is not None:
         while True:
-            if session.published_frame is not session.latest_frame:
+            if session.published_frame is session.latest_frame:
+                time.sleep(0.001)
+            else:
                 if session.latest_frame is None:
                     continue
                 encode_param = [int(cv2.IMWRITE_JPEG_QUALITY), 50]