avoid repetitive log placeholder

app.py

@@ -32,6 +32,7 @@ if run_btn and video_file:
     st.info("Processing started. This may take several minutes depending on video length …")
     # container for live log streaming
     log_container = st.container()
+    log_placeholder = log_container.empty()
 
     # Run pipeline via subprocess to avoid blocking UI; capture logs
     with st.spinner("Running Lec2Note2 pipeline …"):
@@ -58,6 +59,7 @@ if run_btn and video_file:
         threading.Thread(target=_enqueue_output, args=(proc.stdout, log_queue), daemon=True).start()
 
         logs = ""
+        line_count = 0
         while True:
             try:
                 line = log_queue.get(timeout=0.1)
@@ -67,7 +69,12 @@ if run_btn and video_file:
                     break
                 continue
             logs += line
-            log_container.code(logs, language="bash")
+            line_count += 1
+            if line_count % 5 == 0:  # update UI every 5 lines to reduce overhead
+                log_placeholder.code(logs, language="bash", height=300)
+
+        # final flush
+        log_placeholder.code(logs, language="bash", height=300)
 
         result_code = proc.wait()
     if result_code != 0: