AVisynth Theory

mckeed · Post by **mckeed** » Thu Dec 18, 2003 12:35 pm

Ok, as ppl can tell know i've been fiddling with AVIsynth alot recently. I have been trying to think alot of this through in my head so that I can make intuitve sense of what is going here and learn how to make the filters do a better job.

So i've come up with a set of steps i think is the correct order in doing things. This assumes that we are doing all preprocessing.
Here is goes:

1) Load the file.....duh
2) do an deinterlacing, if any, that needs to be done
3) clean the footage entirely in one colorspace if possible
a)adjust necessary color levels or remove the wierder artifacts
b)smooth
c)clean
d)sharpen
e)Dup is source is older like the Oh! My goddess DVD's
4) If you need to get rid of black bars on footage do that now
5) LancozResize since if we cropped since we are enlarging the footage from the croped size
6) prepare footage for premire
a) AssumeFPS
b) ConvertToRGB32 (AD says that it isn't wise to trust premire)

Obviosuly while editing, the only parts of the script that isn't commented out is the colorspace conversion, assumefps and the interlacing stuff.

I guess I would like to start a discussion on what other people have found works well for them. Not specific filters, but order of steps. Maybe even possible explanation of why that order is best. Maybe its better to split certain operations into pre and post?

AbsoluteDestiny · Post by **AbsoluteDestiny** » Thu Dec 18, 2003 12:42 pm

I wouldnt use Dup anymore, to be honest - it's too fiddly... best off just sticking with some good temporal cleaners.

Otherwise I think this is a pretty good list.

ErMaC · Post by **ErMaC** » Thu Dec 18, 2003 1:44 pm

You first want to crop any black bras otherwise they'll interfere with smoothing, sharpening, and other image-sensitive filters. The only filter you want to do before cropping is BlindPP() if you're using it.

AbsoluteDestiny · Post by **AbsoluteDestiny** » Thu Dec 18, 2003 2:05 pm

ErMaC wrote:crop any black bras

It's like the digital video version of the sixties!

godix · Post by **godix** » Thu Dec 18, 2003 2:20 pm

ErMaC wrote:You first want to crop any black bras

I realize that censorship in some anime brought to America is pretty bad but does is it bad enough to require a seperate step for all your footage?

trythil · Post by **trythil** » Thu Dec 18, 2003 2:54 pm

ErMaC wrote:You first want to crop any black bras otherwise they'll interfere with smoothing, sharpening, and other image-sensitive filters.

Yeah, black bras tend to interfere with what I'm focusing on, too.

Er.

mckeed · Post by **mckeed** » Thu Dec 18, 2003 3:05 pm

ErMaC wrote:You first want to crop any black bras otherwise they'll interfere with smoothing, sharpening, and other image-sensitive filters. The only filter you want to do before cropping is BlindPP() if you're using it.

what is blindPP()?

AbsoluteDestiny · Post by **AbsoluteDestiny** » Thu Dec 18, 2003 3:22 pm

mckeed wrote:what is blindPP()?

It's like the post-processing options of mpeg2dec3 but applied to footage that it doesnt actually know the original quantisers (like regular AVISource footage)

mckeed · Post by **mckeed** » Thu Dec 18, 2003 3:40 pm

there a AVIsynth 2.5 plugin for that? I didn't see it listed om warpenterprises avisynth filter collection page?

AbsoluteDestiny · Post by **AbsoluteDestiny** » Thu Dec 18, 2003 3:42 pm

mckeed wrote:there a AVIsynth 2.5 plugin for that? I didn't see it listed om warpenterprises avisynth filter collection page?

It's contained within MarcFD's mepg2dec3.dll (I think) - I dont know if it was also included in Donald Graft's mpeg2dec3dg.dll or not.