视频聊天系统作为一种新型的通信和交流工具，突破了地域的限制，可以提供更为便捷、灵活、全面的音、视频信息的传递和服务，具有极其广泛的发展前景。
本文介绍了采用Microsoft Visual C++ 6.0编程开发视频聊天系统的一套比较常用的解决方案。文字聊天和语音视频聊天采用UDP模式，在客户端之间点对点的进行。在该方案中，通过函数库VFW来实现视频捕获、影像压缩以及影像播放。微软公司提供的专门用于视频捕获开发的工具包VFW，为在Windows操作系统中实现视频捕获提供了标准的接口，从而大大降低了程序的开发难度。在视频传输方面，我们选用的是较快速的H.263编码器库，该库具有相当好的压缩比率，从而有效地克服了我们在图像传输中的速度矛盾。同时，在本方案中，采用了线程来实现语音录制和语音回放，最终实现了文字聊天、点对点的语音视频聊天。
关键词：文字聊天,VFW,视频捕获,视频传输,语音录制, 语音播放
ABSTRACT
As a new tool about communication, video chatting system has broken through geographical restrictions, has provides more convenient, flexible and complete transmission and service. Furthermore, it has a very bright future.
The common solution about how to develop a video chatting system is introduced by the Microsoft Visual C + + 6.0 programming. UDP model is used in the text chatting and the point-to-point video chats between the Clients. In this plan, Video Capture, Video Compression Manager and DrawDib are realized by the functions of VFW Library. The special kit VFW (Video for Windows) in video capture offered by Microsoft Corporation, has provided a standard interface for video capture in Windows Operating System and thus greatly reduced the hardship of programming. In video transmission aspect, we select the H.263 encoder storehouse, this storehouse has the quite good compression ratio, so overcame the contradiction of the image transmission speed effectively. Meanwhile, the thread is used to achieve audio recording and replaying. Finally, it has realized the text chatting to transit, the point-to-point audio and video chats.
Keywords: Text Chat, VFW, Video Capture, Video Transit, Audio Record, Audio Play
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