Interlaced Movies

[mrbungle]

Hi, if i have a PAL movie (25fps) with frame type 'Interlaced' do i have to use deinterlace filter in nandub in every case ? For the last movie i checked the 'interlaced' box which is an option in the resize filter config and i added an 'deinterlace filter' with 'blend' mode. But that made the divx quality worst. Without using that (also no 'checked' interlace box in resizing filter)i got good quality.

[manono]

Hi-When DVD2AVI claims a PAL movie is interlaced, it is frequently wrong. So, you have to scroll the movie carefully looking for interlacing. If you don't see any, then don't deinterlace.

In cases where you must deinterlace, there are better deinterlacers. Maybe try Decomb.

[molmik]

I've really got confused about this interlaceing problem. Hypothetically, every movies played on TV's should be interlaced because the system of used and all DVD's so. By waching the movie using DVD2avi and serching for vertical lines I do not think this is the best way to judge interlaceing problem. It looks like Decomb3 Telecide() can take care about this problem. May be I'm wrong this is just my feeling. I've tried several PAL movies and it worked for me.
By the way, telecise originaly used to convert movies (24 fps) to NTSC (29.97fps), based on my reading.
One problem however occures when we set up avi file for Nandub using DVD2avi and Decomb3: Decomb3 needs YUY2 format so you have to convert the input to YUY2 befor processing and that is time consuming, the author says.
Is there any other easy way to get inmediatelly YUY2 format avi?
Other problem: It looks like AviSynth is a good way to prepare avi file for NanDub. You can use VirtualDub filters before NunDab processing. This makes everything faster, however you nedd to have an avi in RGB32 format. So you can not win this game. YUY2 or RGB or both converting back and forth?
I know this shoud go to Avisynth forum however the common part is NanDub!! and newbies!!:rolleyes: :confused:
Thanksfor any comment!

[manono]

Hi again-

By waching the movie using DVD2avi and serching for vertical lines

You mean horizontal lines, right? It will show most easily in motion scenes as fine parallel horizontal lines. It's pretty easy to spot. If you find any at all, then there are usually more you didn't see, and you have to deinterlace. I usually scroll or play the .d2v in GKnot.

One problem however occures when we set up avi file for Nandub using DVD2avi and Decomb3

I hope you mean the .avs file. If you are using the VFAPI method, then you're right, as Decomb is an AviSynth plug in. But if you're creating your .avs in GKnot, then it's already in YUV (you should enable it in DVD2AVI-Video-Colorspace-YUV 4:2:2).

If you wish to use the Nandub filters, then yes, it will be converted to RGB automatically, and you must use Full Processing, and encoding slows down. If you do it right, you never have to have the Convert To RGB command in your .avs.

I hope I've answered the questions, but you've gotten me a bit confused too. :confused:

[molmik]

1.Yes I meant horizontal lines.
So I see no horizontal lines no deinterlace needed. Basically I do not need Decomb Telicide() command. If there are some horizontal lines I shoud use it.
But there is no problem if if do it only unnecessary time consuming. Right?

2. Yes I meant .avs file and I used VFAPI method. So using GKnot the file is YUY2 automatically. Thanks I'll try it.

3. I meant, using VD filtering in AviSynth not in NanDub. So the avs (film.avs that loaded into NanDub) file shoud be as the folloing one:
AVISource("e:\Rips\film_d2v-vfapi.avi")
Import("d:\Avisynth\vdfilters.avs")

and the activated and requested VD filters

for example
VD_WarpSharp(100)
etc.
For this I need RGB format because the error message says so.

[manono]

Hey-
1. Well-if you don't need it, don't use it. Not only will it slow things down, but it could conceivably degrade quality. If you're worried about a few interlaced frames showing up, then load the Decomb plug in and use FieldDeinterlace() by itself (explanation in the help file).

2. I think you'll find that frameserving with an .avs file will make your encodes much faster, even if you have to switch into RGB to apply the filters you're interested in.

3. I can't help you there as I use those filters in Nandub. I'm too lazy to learn how to write the AviSynth script. I see you got a reply about it in the AviSynth Forum, although I'm not sure it's exactly what you had in mind. There's more information in this thread (http://forum.doom9.org/showthread.php?s=&threadid=15777&pagenumber=1)

[molmik]

Thanks for the answer. Finaly, I've made a pretty good DiVix rip of "The Peacemaker" (119 min)on 2 CD's.
I think I started to undertand and use NanDub as a beginner.:rolleyes:
However it took me 38 hours to acomplish, the first and the second run together on a Toshiba Satelite laptop (P3, 850 MHz, 128 Mb RAM.:(

[Dave]

I tried using Decomb on a few interlaced PAL movies I have. While it deinterlaced properly, I had real problems with jerkiness; something I also experienced using GreedyHMA. :/

[manono]

Dave-If you have a true video sourced interlaced movie, then Telecide() will make it jerky. You might try just FieldDeinterlace()

And of course you didn't do anything silly like use Force Film in DVD2AVI (resulting in a 20fps .d2v), right?

If that doesn't solve it, you might report it to the author in the AviSynth forum for further advice.

[molmik]

@manono, Dave

Well, I think my PAL movie was not interlaced based on what Manono said about waching DVD2avi screen. I've still used Telecide() and Decimate(25) in Decomb3. However I did not see any strips, or jerkiness. Only I had this problem with GreedyHMA, specially at the right side of the screen. If you look up the AviSynth forum or the info of GreedyHMA you can find this error as a limitation. They suggest to crop that side. Decomb3 neved did so far with PAL movies but I did not test to many of them.