概述：
把大华VMS上的视频用DirectShow转换成能够实现在基于ActiveX播放器中播放，例如能够在浏览器（IE）中播放。
可以提供大华VMS接口SDK文档。

具体需求：
需要在大华VMS端做两个部分的开发：
1. 实现满足下列要求DirectShow Filter
- Must be opened by URL (EG Open URL in Windows Media Player)
- Must convert video to raw images in RGB24 format
- Must be able to pass all information to authenticate and specify camera ID in URL
- Must be able to provide images to analytics in 4CIF or VGA resolution (this can be done by downsampling by Filter or configuration on VMS).
2. 实现基于ActiveX播放器，用于在浏览器（IE）中播放视频
- Must provide Live Video with selectable Camera
- Must provide Recorded Video accessible by TimeStamp