在windows提供的directshow平台上开发的一个底层filter，实现了在实时播放的mpeg2媒体中插播mpeg2媒体的功能，即所谓的拼接功能。-Directshow in windows platform provided by the development of a low-level filter, realized in real-time broadcast media spots mpeg2 mpeg2 media functions, the so-called sti