Edit a video to embed a bitmap

I would like to edit a video so that i can embed a small bitmap image at any corner. The bitmap image has to be replaced with another image, for every two video frames.

If somehow it is possible to covert a group of pictures into slideshow video then i want that video to be embedded at the corner of the main video.

The size of the bitmap is about the size of a channel logo and that is exact space it will occupy in the video.

Please guide me in a开发者_Python百科ccomplishing. Is there any existing libraries available to do this.

I am working on .Net 4 platform but i do welcome support from other platforms

You can use Avisynth with the Overlay() function