I've started to "bookmark" interesting Avisynth threads. I see a lot of stuff that I don't (yet) need, or haven't (yet) tried. Too many posts get lost without being curated. This thread was original in the hidden Site Staff area, but I think it'll help others, so sharing here.
Feel free to add your own (mostly for yourself, but shared with others) below. I'll merge all of your posts, so one bookmark post per person.
color correction, sanlyn:
Avisynth help: Transparent lines in the video?
dropouts, sanlyn:
Identifying artifacts, fixed with video filters?
more color correction, sanlyn and others:
Pack/zip file of VHS restore filters? + mega/multi script?
ColorBalance():
How to colour grade VHS captures in Avisynth?