本文详细阐述了基于DirectShow核心框架的非线性编辑的基本原理，并提供了一个编辑的源代码，演示如何拼接两个音视频文件，实现视频过渡效果，并预览。-The principle of non-linear edit based on DirectShow core fr a me is explained detailedly in the paper, and the source code for edit is provided