video compression in vb 2005?

i wanted to ask is t开发者_开发知识库here any means i can compress a video file(.avi) to a small size than original.

If yes..how..?

A sample code/tutorial to do so would be of great help

Which API should i use(except the DirectX)..?

Is DirectX advisable?

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You could use ffmpeg.Net http://www.codeplex.com/ffmpegdotnet