实现多点到多点的视频和语音通信，一个客户端可以同时请求其他三个人进行视频语音通信。是陆其明老师《Directshow实务精选》中的实例程序的扩展。-Multi-multipoint video and voice communications, a client can request the other three individuals at the same time video and voice communications. Lu Qiming is an extension of