diff --git a/python_core/services/media_manager.py b/python_core/services/media_manager.py
index d90d588..d32627b 100644
--- a/python_core/services/media_manager.py
+++ b/python_core/services/media_manager.py
@@ -292,11 +292,31 @@ class PySceneDetectSceneDetector(SceneDetector):
 
             # 如果没有检测到场景变化，添加视频结束时间
             if len(scene_changes) == 1:  # 只有开始时间0.0
-                # 获取视频时长
-                video_duration = video_manager.get_duration().get_seconds()
-                if video_duration > 0:
-                    scene_changes.append(video_duration)
-                    logger.info(f"No scenes detected, using full video duration: {video_duration:.2f}s")
+                # 获取视频时长 - 处理不同的返回类型
+                try:
+                    duration_obj = video_manager.get_duration()
+                    if hasattr(duration_obj, 'get_seconds'):
+                        video_duration = duration_obj.get_seconds()
+                    elif isinstance(duration_obj, (tuple, list)) and len(duration_obj) >= 2:
+                        # 如果是tuple，通常格式是 (frames, fps)
+                        frames, fps = duration_obj[0], duration_obj[1]
+                        video_duration = frames / fps if fps > 0 else 0
+                    elif isinstance(duration_obj, (int, float)):
+                        video_duration = float(duration_obj)
+                    else:
+                        # 回退方案：从文件路径获取时长
+                        video_duration = self._get_video_duration_fallback(file_path)
+
+                    if video_duration > 0:
+                        scene_changes.append(video_duration)
+                        logger.info(f"No scenes detected, using full video duration: {video_duration:.2f}s")
+                except Exception as e:
+                    logger.warning(f"Failed to get video duration from PySceneDetect: {e}")
+                    # 回退方案：从文件路径获取时长
+                    video_duration = self._get_video_duration_fallback(file_path)
+                    if video_duration > 0:
+                        scene_changes.append(video_duration)
+                        logger.info(f"Using fallback video duration: {video_duration:.2f}s")
 
             scene_changes = sorted(list(set(scene_changes)))
             video_manager.release()
@@ -310,6 +330,16 @@ class PySceneDetectSceneDetector(SceneDetector):
             logger.error(f"PySceneDetect failed: {e}")
             raise
 
+    def _get_video_duration_fallback(self, file_path: str) -> float:
+        """获取视频时长的回退方案"""
+        try:
+            # 使用视频信息提取器获取时长
+            video_info = self.video_info_extractor.extract_video_info(file_path)
+            return video_info.get('duration', 0.0)
+        except Exception as e:
+            logger.warning(f"Fallback duration extraction failed: {e}")
+            return 0.0
+
 class OpenCVSceneDetector(SceneDetector):
     """使用OpenCV进行场景检测"""