feat(napcat_adapter): 增强视频处理配置，添加最大大小和超时设置，并更新消息处理器以支持新配置

src/plugins/built_in/napcat_adapter/plugin.py

@@ -414,7 +414,22 @@ class NapcatAdapterPlugin(BasePlugin):
             "enable_emoji_like": ConfigField(type=bool, default=True, description="是否启用群聊表情回复处理"),
             "enable_reply_at": ConfigField(type=bool, default=True, description="是否在回复时自动@原消息发送者"),
             "reply_at_rate": ConfigField(type=float, default=0.5, description="回复时@的概率（0.0-1.0）"),
-            "enable_video_processing": ConfigField(type=bool, default=True, description="是否启用视频消息处理（下载和解析）"),
+            # ========== 视频消息处理配置 ==========
+            "enable_video_processing": ConfigField(
+                type=bool, 
+                default=True, 
+                description="是否启用视频消息处理（下载和解析）。关闭后视频消息将显示为 [视频消息] 占位符，不会进行下载"
+            ),
+            "video_max_size_mb": ConfigField(
+                type=int, 
+                default=100, 
+                description="允许下载的视频文件最大大小（MB），超过此大小的视频将被跳过"
+            ),
+            "video_download_timeout": ConfigField(
+                type=int, 
+                default=60, 
+                description="视频下载超时时间（秒），若超时将中止下载"
+            ),
         },
     }
 

src/plugins/built_in/napcat_adapter/src/handlers/to_core/message_handler.py

@@ -37,10 +37,21 @@ class MessageHandler:
     def __init__(self, adapter: "NapcatAdapter"):
         self.adapter = adapter
         self.plugin_config: dict[str, Any] | None = None
+        self._video_downloader = None
 
     def set_plugin_config(self, config: dict[str, Any]) -> None:
-        """设置插件配置"""
+        """设置插件配置，并根据配置初始化视频下载器"""
         self.plugin_config = config
+        
+        # 如果启用了视频处理，根据配置初始化视频下载器
+        if config_api.get_plugin_config(config, "features.enable_video_processing", True):
+            from ..video_handler import VideoDownloader
+            
+            max_size = config_api.get_plugin_config(config, "features.video_max_size_mb", 100)
+            timeout = config_api.get_plugin_config(config, "features.video_download_timeout", 60)
+            
+            self._video_downloader = VideoDownloader(max_size_mb=max_size, download_timeout=timeout)
+            logger.debug(f"视频下载器已初始化: max_size={max_size}MB, timeout={timeout}s")
 
     async def handle_raw_message(self, raw: dict[str, Any]):
         """
@@ -325,10 +336,13 @@ class MessageHandler:
                     },
                 }
             elif video_url:
-                # URL下载处理
-                from ..video_handler import get_video_downloader
-                video_downloader = get_video_downloader()
-                download_result = await video_downloader.download_video(video_url)
+                # URL下载处理 - 使用配置中的下载器实例
+                downloader = self._video_downloader
+                if not downloader:
+                    from ..video_handler import get_video_downloader
+                    downloader = get_video_downloader()
+                
+                download_result = await downloader.download_video(video_url)
 
                 if not download_result["success"]:
                     logger.warning(f"视频下载失败: {download_result.get('error', '未知错误')}")