优化一下时长计算问题

wechat_ipad/client/message.py

@@ -237,7 +237,15 @@ class MessageMixin(WechatAPIClientBase):
             media_info = MediaInfo.parse(video_path)
         else:
             raise ValueError("video should be str, bytes, or path")
-        duration = media_info.tracks[0].duration
+            # 获取视频时长
+        duration = None
+        for track in media_info.tracks:
+            if track.track_type == "Video" and track.duration is not None:
+                duration = track.duration / 1000  # 将毫秒转换为秒
+                break
+        if duration is None:
+            duration = 1
+            self.logging.error(f"无法从视频文件获取时长: {video}")
 
         # get image base64
         if isinstance(image, str):