Resizing Interlaced material with AviSynth

[gastorgrab]

What is the proper way?

If i change the vertical height of interlaced material the interlace lines will be the wrong size for the new scale. Come to think of it, the number of interlace lines would be different depending on the scale.

Shoud i separate the fields, resize, and then re-weave?

[phelix]

That exactly what you do. Lately I've been playing around with the following avisynth snippet:

# for 16:9
crop(0,60,544,360)
SeparateFields().LanczosResize(720,240).Weave()

That is for stretching letterboxed material to make it anamorphic. It works good for live action, but small text like subtitles doesn't come out very good. Haven't tried animated meterial yet.

[gastorgrab]

Thanks, i'll try that.

Since my post i found a couple of interesting filters:

In the package SimpleResize there's a filter included called "InterlacedResize".
http://mywebpages.comcast.net/trbarry/SimpleResize.zip

And another designed specifically for interlaced material.
http://mywebpages.comcast.net/trbarry/YV12InterlacedReduceBy2.zip

There's also a few other interesting filters at http://mywebpages.comcast.net/trbarry/home.htm, but i havn't had a chance to try them yet.

Are you familiar with these, or are you aware of anymore?

[FulciLives]

I use a different method that I discovered on the doom9 forums that works really well.

Here is a link to a thread HERE on VIDEOHELP.COM where I talk about that method and where to get the AviSynth "plug-in" you need.

https://www.videohelp.com/forum/viewtopic.php?t=221132

Works for me

This is not only great for resizing but also for applying "noise" filters such as Convolution3D

- John "FulciLives" Coleman

[gastorgrab]

So this is basically the same idea but only automated?

Wait.......it does a whole lot more than that.

Looks like i've got some reading to do.

Thanks.

[FulciLives]

So this is basically the same idea but only automated?

Wait.......it does a whole lot more than that.

Looks like i've got some reading to do.

Thanks.

Well YES and NO

It does automate the process but I guess the "big deal" is that it does it better than what you can do by simply using SeparateFields() and Weave()

Take a look at this here thread on the doom9 forums:

http://forum.doom9.org/showthread.php?s=&threadid=75734

Look for the posts by user "stickboy" in this thread.

- John "FulciLives" Coleman

[gastorgrab]

Looks like i've got some reading to do.

What he said.