| The on-line remote teaching system breakthroughs the space and time limit, provides enormous convenience for the general learners. The courseware making platform is an important component of a remote teaching system. It mainly realizes synthesis of audio, video of the teacher and the courseware content, prepares for releasing the teacher's real-time explanation content on the network in the later period. This article designs a courseware making platform based on a technology of the DirectShow, has made the thorough discussion on the basic technology which involved, and has implemented the software of the courseware editor subsystem.This article first discusses the technology of COM module and the work principle of DirectShow technology, emphasizes on how to use above technology to develop the captions superposed filter used in the courseware making platform, then introduces the technology of ASF the media stream technology, discusses the ASF file format and the ASF media coding technology with emphasis, proposes an applied scheme of ASF in the courseware making platform. Finally, uses the paradigm of DirectShow technology, produces the realizing scheme of the courseware making platform, carries out the system design in courseware collection, coding, the edition synthesis and courseware release, has specially in detail discussed the design and implementation of the courseware editor platform. This article also has great reference to other professional applications of audio and video non-linear edition. |
