Video compression is the core technology for video conference, and its quality depends on the compression technology. The H.264 is a high-performance en/decoding algorithm, which has higher compression ratio and better network suitability. This paper introduces the key technology of the H.264 coding algorithm and the framework of Directshow technology. Besides, through embedding the FFmpeg, the open-source library of H.264, into the Directshow Filter Graph, researchers can encode and decode the video data of users.%视频压缩是视频会议中的核心技术，压缩技术的好坏决定着视频会议质量的高低. H.264是一种高性能的编解码算法，具有较高的压缩比和较好的网络适配性.对 H.264编解码算法中的关键技术进行了介绍，同时介绍了Directshow技术框架.并且，通过将开源的H.264编解码库FFmpeg嵌入到Directshow 链路中，实现对用户视频数据的编码压缩及解码播放.
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