diff --git a/tools/screencast/recorder.py b/tools/screencast/recorder.py
index cfd213c..331049c 100644
--- a/tools/screencast/recorder.py
+++ b/tools/screencast/recorder.py
@@ -4,15 +4,27 @@ from __future__ import annotations
 import threading
 import time
 from pathlib import Path
+from typing import Optional
 
 import mss
 import mss.tools
 
 
 class ScreenRecorder:
-    def __init__(self, frames_dir: str, fps: int = 10):
+    def __init__(
+        self,
+        frames_dir: str,
+        fps: int = 10,
+        monitor_index: Optional[int] = None,
+    ):
+        """
+        Args:
+            monitor_index: mss 显示器索引；None=monitors[0]（所有屏合并区域，
+                          旧行为），1=主屏，2+=第 N 屏。多显示器场景推荐显式传 1。
+        """
         self._frames_dir = Path(frames_dir)
         self._fps = fps
+        self._monitor_index = monitor_index
         self._stop_event = threading.Event()
         self._thread: threading.Thread | None = None
         self._frame_count = 0
@@ -36,7 +48,10 @@ class ScreenRecorder:
     def _capture_loop(self) -> None:
         interval = 1.0 / self._fps
         with mss.mss() as sct:
-            monitor = sct.monitors[0]  # 全屏（monitor[0] 是所有显示器合并区域）
+            idx = self._monitor_index if self._monitor_index is not None else 0
+            if idx < 0 or idx >= len(sct.monitors):
+                idx = 0  # 越界兜底
+            monitor = sct.monitors[idx]
             while not self._stop_event.is_set():
                 t0 = time.perf_counter()
                 img = sct.grab(monitor)
diff --git a/tools/screencast/runner.py b/tools/screencast/runner.py
index 13ef29f..e9aa61e 100644
--- a/tools/screencast/runner.py
+++ b/tools/screencast/runner.py
@@ -10,6 +10,24 @@ from datetime import datetime
 from pathlib import Path
 from typing import List, Optional, Tuple
 
+
+def _ensure_sdk_on_path() -> None:
+    """record_screencast.py 直接 python 跑时不走 conftest，SDK 可能不在 sys.path。
+    自带兜底：从 tools/screencast/runner.py 上溯到 platform-kit/src。"""
+    import importlib.util
+    if importlib.util.find_spec("jiangchang_desktop_sdk") is not None:
+        return
+    # tools/screencast/runner.py → tools/screencast → tools → platform-kit
+    here = Path(__file__).resolve()
+    src = here.parent.parent.parent / "src"
+    if (src / "jiangchang_desktop_sdk").is_dir():
+        import sys as _sys
+        _sys.path.insert(0, str(src))
+
+
+_ensure_sdk_on_path()
+from jiangchang_desktop_sdk.window_win32 import activate_and_maximize_jiangchang_window  # noqa: E402
+
 from .composer import compose_video
 from .recorder import ScreenRecorder
 from .subtitle import SubtitleEngine
@@ -23,6 +41,8 @@ def run_screencast(
     media_assets_root: Optional[str] = None,
     music_subdir: str = "music",
     fps: int = 10,
+    activate_window: bool = True,
+    monitor_index: Optional[int] = None,
 ) -> str:
     """
     录制一次技能桌面 E2E 演示视频。
@@ -36,7 +56,11 @@ def run_screencast(
                            不传时读 MEDIA_ASSETS_ROOT 环境变量，
                            再不存在则用默认值 D:\\OpenClaw\\client-commons\\media-assets
         music_subdir:     music_assets_root 下音乐子目录，默认 "music"
-        fps:              截帧帧率，默认 10
+        fps:               截帧帧率，默认 10
+        activate_window:   录屏开始前是否自动激活+最大化匠厂窗口（默认 True；
+                          Windows 走 ctypes，非 Windows 走 jiangchang:// 协议）
+        monitor_index:     指定录哪个显示器；None=所有显示器合并（旧行为），
+                          1=主屏，2+=第 N 屏（推荐多显示器场景显式传 1）
 
     Returns:
         输出 MP4 的绝对路径
@@ -59,7 +83,15 @@ def run_screencast(
     engine = SubtitleEngine(subtitle_script)
 
     with tempfile.TemporaryDirectory(prefix="screencast_frames_") as frames_dir:
-        recorder = ScreenRecorder(frames_dir, fps=fps)
+        recorder = ScreenRecorder(frames_dir, fps=fps, monitor_index=monitor_index)
+
+        if activate_window:
+            ok = activate_and_maximize_jiangchang_window()
+            if ok:
+                print("[screencast] 已激活+最大化匠厂窗口")
+                time.sleep(2)  # 等窗口浮起稳定
+            else:
+                print("[screencast] 未能激活匠厂窗口，继续录制（可能录到桌面边角）")
 
         print(f"[screencast] 启动录制 → {output_mp4.name}")
         recorder.start()
diff --git a/tools/screencast/subtitle.py b/tools/screencast/subtitle.py
index a8b7ae8..e52c5ff 100644
--- a/tools/screencast/subtitle.py
+++ b/tools/screencast/subtitle.py
@@ -15,9 +15,15 @@ class _Entry:
 
 
 class SubtitleEngine:
-    def __init__(self, script: List[Tuple[str, str]], default_duration: float = 5.0):
+    def __init__(
+        self,
+        script: List[Tuple],
+        default_duration: float = 5.0,
+    ):
         """
-        script: [(关键词, 字幕文案), ...]
+        script: [(关键词, 字幕文案) | (关键词, 字幕文案, 显示时长秒), ...]
+                - 二元组：用 default_duration（向后兼容）
+                - 三元组：本条字幕独立指定显示秒数（用于长等待场景延长字幕停留）
         关键词大小写不敏感，每个关键词只触发一次。
         """
         self._script = script
@@ -31,12 +37,19 @@ class SubtitleEngine:
 
     def process_line(self, line: str) -> None:
         lower = line.lower()
-        for keyword, text in self._script:
+        for entry_tuple in self._script:
+            if len(entry_tuple) == 2:
+                keyword, text = entry_tuple
+                duration = self._default_duration
+            elif len(entry_tuple) == 3:
+                keyword, text, duration = entry_tuple
+            else:
+                continue
             if keyword in self._matched:
                 continue
             if keyword.lower() in lower:
                 elapsed = time.time() - self._t0
-                self._entries.append(_Entry(start=elapsed, text=text, duration=self._default_duration))
+                self._entries.append(_Entry(start=elapsed, text=text, duration=float(duration)))
                 self._matched.add(keyword)
 
     def generate_srt(self, output_path: str) -> None: