Unfortunately it appears that medical issues and site upgrades put the kabosh on big tutorial plans, and I can certainly emphathize. But IMO there's no such thing as a true all-encompassing tutorial. it's like promising to teach 100% of Java scripting in a single thread -- not really possible. And many have tried to devise a one-size-fits-all Avisynth script to fit all cases. That's like coming up with a one-size-fits-all routine for fixing cars: more fantasy than praqcicality.
Most people start with Avisynth's own Getting Started (
http://avisynth.nl/index.php/Getting_started). One caution: they recommend that you try the test scripts by playing them in Windows Media Player. Well, don't do that. Bill and his boys have turned WMP into pure junkware. You might as well riun Avisynth scripts the way most people do, with
Virtualdub. VDub sees qan Avisynth script as a video, so just open it using "Open video file...", look for your .avs script file, and open it.
Beyond simple test scripts, most people learn Avisynth by looking through forums to see how others use it. Actual working scripts are the way most users pick nup tips on scripting and on how to use the filters. Most of the popular filters themselves have extensive documentation -- just type "Avisynth" and the name of a plugin in google, and you'll get more than you bargained for. Avisynth's hundreds of built-in functions and utilities can be researched in the same way. And don';t forget that
Virtualdub's filters are also important.
You'll find dozens of threads in the forum that go into detail on Avisynth and Virtualdub usage, often with pictures and with samples of dreadfully awful video that needs serious work. In the thread at
http://www.digitalfaq.com/forum/vide...d-problem.html post #8 shows how to analyze a video problem, while post #9 discusses line-by-line details of an Avisynth script used to try to fix things. Another thread shows what illegal levels are, each step in YUV levels correction in Avisynth, and an mp4 of kids' picnic reworked from an original sample (post #6 in
http://www.digitalfaq.com/forum/vide...html#post50797).
http://www.digitalfaq.com/forum/vide...-avisynth.html is a thread with several posts of Avisynth/Virtualdub process details and download links.
Post #3 in the thread
http://www.digitalfaq.com/forum/vide...html#post57143 has Avisynth script details and a few download links, and post #2 in that same thread has a bunch of filter links. Unfortunately post#2 has bad link to the QTGMC package that lacks MaskTools, but it's corrected in
post #6. Entire thread is useful for script details, links, and notes about Avisynth 2.6.
In another thread there's a ton of video samples, images, scripts, details and links on
page 3 and
page 4.
Still another thread at
http://www.digitalfaq.com/forum/vide...restoring.html and lots of pictures and details in posts #2, #4, #6 and #8.
There are links to several filters in another thread in
post #15, with lots more detail for Avisynth controls and Avisynth filters in
Information Overload #1, followed by
Information Overload #2,
Information Overload #3,
Information Overload #4, and some of my own sister's dumb video mistakes in
Information Overload #5.
That might be enough to get you started. There are many, many more.