优化历史录像下载，目前已测试大华国标级联下载

wangyimeng

2023-03-09 14c4a3c7e81e9a3898a3f301b9303c381a806932

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package com.genersoft.iot.vmp.service.bean;
 
public interface PlayBackCallback<T> {
 
    void call(PlayBackResult<T> msg);
 
}