What is Donald Grafts new Decomb method?

[GtMustangJim]

What is Donald Grafts new Decomb method? What does it do? will it help me encode interlaced anime with DVD2SVCD ver 1.0.6 build 1.

[neuron2]

Please read the Decomb help file. It will tell you everything you need to know. It is JUST WHAT THE DOCTOR ORDERED for difficult anime.

[Kedirekin]

Actually it's just what the doctor ordered for all anime. I'm even re-doing many titles I've already done.

Thank you greatly for this new filter. It is a god send.

[wfiguero]

What I need to do to use Decomb Plugin with DVD2SVCD?

Thanks,
Wilfredo

[DDogg]

Laterest versions o dvd2svcd have this filter in the installation bundle. Also, if everything works right you should not have to do much of anything :) as it will automatically be called when needed.

[wfiguero]

DDogg,

Thanks for the information.

Wilfredo

[isolationism]

Hi folks,

Was thrilled about the new beta coming out, particularly the addition of this much revered new IVTC plugin. I immediately gave it a shot to see if I could pull out some good results. My DVD of choice was the intro sequence to Patlabor 2.

I'm having a bit of trouble. I read through the manual (got to love software that includes one) but most of the settings don't relate to DVD2SVCD as you have little to no manual control over some of the things mentioned (or they're already taken care of in the background).

My settings are pretty straightforward.
Field Operation: IVTC (Slow as hell)
Frameserver: decomb.dll
Video Encoding Mode: CBR w/ vaf (just for testing purposes)
Conversion: Telecide (to clean up any strays).

Normal animation works fine and looks great. The problem? Pan shots. I read elsewhere in the forums that the studios 'cleverly' use 30fps pan shots whereas most of the animation is done at different framerates that are usually somewhat cleanly divisible into 24. The problem I'm experiencing is a jerky movement during these pans.

When I've played back the encodes around these scenes frame-by-frame, I'm seeing a somewhat irregular pattern of motion -- 2-4 frames of smooth motion, a couple adjoining frames where there's no motion at all, then continuing motion -- and in some cases, the frames will actually skip a frame and/or go back a couple frames. When played back at normal speed you don't actually see the back/forward motion, but you do notice that the pan is very stuttered/jerky. Is there any setting(s) that might resolve this?

TIA for your time!

[neuron2]

@isolationism

Can you make available a VOB fragment or AVI that contains such a pan for me to assess? If you can make an AVI, I need the raw, unprocessed material, not your processed output. Thank you.

[isolationism]

Hi neuron2,

I'm pleasantly surprised by your speedy reply! I'd be happy to do it. I'd love to just hand you the VOB file itself, but unfortunately the chapter it's from is a hefty 277MB which I'm sure you don't want to download. I'll see if I can't arrange something for you of a smaller nature in the next hour or two.

Thanks again!

[isolationism]

neuron2,

I have ripped a short clip (~5 sec.) and encoded it to AVI using the DIVX 4.12 codec. There is no audio in the clip. It was encoded with a single-pass in high quality mode (with no resizing or filtering done, obviously); I hope the quality is sufficient for your needs.

You can get the file here (http://www.isolationism.com/trouble01.avi). It is ~1.7MB.

The shot in question is the pan across the battlefield, about 2/3 of the way through the clip -- some padding was left on each side for comparison's sake.

Let me know if you need anything else! I'm happy to help (or to be a pain in the ass, which is what I must be doing now, hmmm ... Sorry about that :| )

[neuron2]

@isolationism

I downloaded your clip. The clip appears to be 30fps material throughout, certainly the pan scene is. So I made a simple Avisynth script:

LoadPlugin("decomb.dll")
Telecide

The result is fine. The pan steps a little on each frame and never goes backwards. When rendered and viewed at normal speed the result is also fine; things look quite smooth.

If you add Decimate to the script then you get the expected slight jerkiness due to erroneously decimating a 30fps stream, but there is certainly no backward motion.

You can easily duplicate these results. Conclusion: If you are getting different behavior with DVD2SVCD, please consult its author for an explanation.

[isolationism]

Neuron2,

You were dead on the money. I used DVD2SVCD with ITVC Off (Force Film set to Automatic) and manually added Decomb.dll and telecide into the AVIsynth script and got great results. The rest of this message is mostly for the benefit of other DVD2SVCD users, so don't feel obliged to read it as I don't want to waste any more of your time.

The reason for my problem was that in order to 'automatically use decomb.dll in DVD2SVCD, ITVC must be activated -- and when ITVC is selected, it adds Decimate to the script file.

When I removed Decimate manually white still using ITVC mode, I ran into audio synchronisation problems -- the video played too slowly for the audio. As I said above, ITVC OFF is the way to go here.

For those who need everything spelled out for them (like me), here's what I did:

- DVD2AVI Tab, select 'Automatic' (or 'Off')
- Frameserver Tab, under "Edit the Avisynth Script File" select "Edit when dvd2avi processing is done"
- Allow the movie to start ripping.
- When the script window comes up, add:

LoadPlugin("%pathtoplugin%\Decomb.dll")

- Then, under "mpeg2source(...)", add:

telecide

And that should do it.

Thanks again for your help, neuron2. The plugin works great! Sorry for bothering you regarding its use in DVD2SVCD.