That's not really a matter of this topic, I believe ... VirtualDub2 just provides basic access to them. But what they are, what they do, how they work, how you can configure them ... that's documented elsewhere. Primarily in their own documentation, some of that in general Media and Codec Wikis (even the Wikipedia, regarding their underlying standards), or in the documentation of ffmpeg. Writing a new guide just for you would be a full-time job (and I already have a different one).
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