优化一下时长计算问题

wechat_ipad/client/message.py

@@ -241,7 +241,7 @@ class MessageMixin(WechatAPIClientBase):
         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
+                duration = int(track.duration / 1000)  # 将毫秒转换为秒
                 break
         if duration is None:
             duration = 1