添加心跳到期时验证zlm是否真的离线。

src/main/java/com/genersoft/iot/vmp/service/impl/PlayServiceImpl.java

@@ -145,6 +145,7 @@ public class PlayServiceImpl implements IPlayService {
                         MediaServerItem mediaInfo = mediaServerService.getOne(streamInfoForSuccess.getMediaServerId());
                         String streamUrl = streamInfoForSuccess.getFmp4();
                         // 请求截图
+                        logger.info("[请求截图]: " + fileName);
                         zlmresTfulUtils.getSnap(mediaInfo, streamUrl, 15, 1, path, fileName);
                     }
                 }