Update app.py

app.py

@@ -134,23 +134,24 @@ def _launch_demo(args):
         messages = []
         content = []
         for q, a in history_cp:
-            if isinstance(q, (tuple, list)):
-                if is_video_file(q[0]):
-                    content.append({'video': f'file://{q[0]}'})
-                else:
-                    content.append({
-                        "type": "image_url",
-                        "image_url": {
-                            "url": f"data:image/jpeg;base64,{encode_image(q[0])}"
-                        }
-                    })        
-            elif q and q.strip(): 
-                content.append({"type": "text", 'text': q})
-                messages.append({'role': 'user', 'content': content})
-                messages.append({'role': 'assistant', 'content': [{"type": "text", 'text': a}]})
-                content = []
-            else:
+            # ---------- 组装 user content ----------
+            if isinstance(q, (tuple, list)):                 
+                user_content = [{"type": "video_url" if is_video_file(q[0]) else "image_url",
+                                 "video_url" if is_video_file(q[0]) else "image_url":
+                                     {"url": f"file://{q[0]}"} if is_video_file(q[0])
+                                     else {"url": f"data:image/jpeg;base64,{encode_image(q[0])}"}}]
+            elif q and q.strip():                                # 非空文本
+                user_content = [{"type": "text", "text": q}]
+            else:                                                # 空串 → 跳过
                 continue
+        
+            messages.append({"role": "user", "content": user_content})
+        
+            if a:                                               # 只有当 a 不为 None / 空串 时才加入
+                messages.append(
+                    {"role": "assistant",
+                     "content": [{"type": "text", "text": a}]}
+                )
                 
         messages.pop()
         responses = client.chat.completions.create(