IVTC and CCE, anybody?

[roman_modin]

Most of DVD's nowadays are using 29.97 frames per second, which is film with pulldown used on it.

My question is this - Is there a way to frameserve CCE 2.5 by way of avisynth (or other) 23.976 frames per second? In other words, is there a script of some sort that can take a 29fps source (like a DVD movie ;-) ) and frameserve it to CCE at 23fps?

Any help is appreciated.

Thanks.

[Kb_cruncher]

use dvd2avi and check"field operation=>force film"then use either gordian knot or fitcd to create your avs script.

[Vapor]

I don't use Knot or FitCD and was wondering whether they are needed for IVTC or can avisynth do it?

Currently I auto IVTC in TMPGENC and vfapi the tpr file. This does slow the frameserving down a lot though :/

Looking for the fastest way of frameserving DVD vob files to CCE at 23.976 from a 29.97 source.

If this has been discussed please point us in the right direction :)

[wmansir]

Yes, Avisynth can do IVTC. In fact, there are several plugins available.

The original InverseTelecine plugin does IVTC only. GreedyHMA and Decomb do IVTC and/or deinterlacing. I think all three are more accurate than Tmpg's automatic IVTC (with the correct settings). However, if I recall Tmpg does it's autoIVTC as a pre-processing step that you only have to do once. With Avisynth the IVTC is done on the fly, so if your doing multiple passes you will in effect be performing IVTC on the video multiple times.

I would recommend Decomb since I believe it's most affective and is easier to use. The readme is very well done and it's author is the moderator of the Avisynth forum (neuron2).

You can use Gknot to create an avisynth script for CCE, you don't need to use it to encode. I use it for every encode to create the basic script as it makes cropping and resizing easy, then manually tweak the avisynth script if needed. The newest version of Gknot includes the ability to include IVTC in the script (using decomb).

As for it's use, I would recommend kb_cruncher's advise to use dvd2avi's ForceFilm option when creating the .d2v file, if possible. This will allow you to get 24fps without incuring the speed hit of IVTC. Howerver, if that doesn't work (look at the 'video type' when saving the .d2v, it will tell you how much of the video is progressive, FILM, or interlaced, NTSC) you will need IVTC.

Unfortunatly doom's guides are a bit behind on this, since the tools are still evolving, so your best source is to browse the avisynth forum to learn more about it.

ps. for CCE 2.5 be sure to check 'Fool CCE' when creating the avisynth script in Gnot.

[Vapor]

Right - ok.

So setting FORCEFILM in DVD2AVI will IVTC back to 24fps. Do I need to do anything with the avisynth script to keep it that way before dumping it into CCE 2.50SP? Kruncher mentioned using GKnot to create the avisynth script - can it not be done by hand?

The audio sync will still be ok encoding at 24fps rather than 23.976 yes?

I've read about and downloaded new avisynth 2.02, dvd2avi 1.86 and mpeg2dec2.dll in hope of simply using dvd2avi for cropping, resizing (if it can do bicubic?) and IVTC and just using avisynth to frameserve. I can always use avisynth 2.02's "included" version of Donald Craft's excellent decomb if the standard IVTC is insufficient.

I do vobs to SVCD using 3pass VBR - Does the above seem like a sensible combo speed wise?

My apologies for all the questions, each guide I read has different opinions :) I've only recently moved across from TMPGEnc in hope of better quality and faster encode times.

Any help is appreciated.

[wmansir]

when using ForceFilm the .d2v file is 24fps, you don't have to use IVTC or do anything special. However, it doesn't always work. It depends on the source. You can think of ForceFilm as a free (speed wise, it has no impact), but bad IVTC. Use it if you can, but it's really a matter of luck.

You can create avisynth script by hand. That's how I did it before, but Gnot makes it much easier. Instead of manually finding and entering the crop values, calculating the resize, and adding your various plugings and filters you just use a nice gui and select the options you want.

Audio will be in sync regardless of IVTC or ForceFilm.

I haven't tried the new Avisynth or d2v so I don't know much about them.

3-pass VBR seems to be the standard for CCE. Some people do five, and if you have the time and are using a very low bitrate, you might want to too. Personaly, I use CBR once I start getting around 2200kbps or above. Of course that's flexible, if I'm doing a lot of processing and getting a very low encode speed I might switch to CBR at a lower bitrate, or if I'm feeling like a perfectionist and it's a really good/difficult movie I might go higher with VBR.

[Guest]

>I can always use avisynth 2.02's built in decomb if the standard
>IVTC is insufficient.

Ooh. A mortal wound. You have killed me. :(

[Vapor]

> Ooh. A mortal wound. You have killed me. :(

My sincere apologies Donald, syntax now adjusted :)

[Guest]

@Vapor

I'm not sure what syntax you're talking about but my joke was directed at the fact that I wasn't too thrilled about Decomb being packaged into Avisynth. But that is water under the bridge.

Decomb 3.9 is imminent!