Originally Posted by ehbowen
Where's the best documentation on learning to use Avisynth?
There is no complete, one-stop-shopping document that tells you how to use Avisynth. The main reasons are that there are dozens of Avisynth plugins and thousands of functions, all of which can be used in hundreds of ways on millions of different video problems. It would take quite a tome to cover that much territory.
However, there's a simplified how-to on the basics of writing Avisynth text scripts. It exists in the online help that is accessed in Windows by opening your program listings, finding the "Avisynth" program group and expanding it, then click on "Avisynth documentation". The online help itself is located in the Avisynth program folder.
Most people learn Avisynth by following forum posts. Usually you'll find the same methods used over and over, since so many problems are common to VHS. You also learn by doing what you've just done, which is submitting samples and questions. You don't always get a solution (obviously, playback problems aren't Avisynth's fault), but with video cleanup you usually get several answers.
[EDIT Sorry, I clicked"Submit" too soon, LOL!]
There is considerable documentation available with the more popular and well-developed Avisynth plugins, as well as hundreds of online articles in the Avisynth wiki (just enter something like "Avisynth Crop" in Google and see what you get). Some of the docs get fairly high-tech -- you don't have to understand all of it, just getting the general idea is usually enough. Often there are examples of how the filter is used in scripts.