Conversion from avi to wmv

I would like to make an avi to wmv convertor on my own. For this, my understanding is I'd study the internal structure of an开发者_开发问答 avi file and extract frame by frame and put in the way wmv encodes the frames. I would like to draw suggestions for learning the pattern of wmv. Is there any online documentation for a layman.

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Hi Windows SDK is your best friend:

• Learn Windows: Audio and Video Development
• Microsoft Windows Software Development Kit

Edit:

find more info about WMV here: http://en.wikipedia.org/wiki/Windows_Media_Video

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Here you can find the WMV/ASF specifications:

Advanced Systems Format (ASF) Specification