Inverse Telecine?

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Inverse Telecine?

Postby Yogurtron » Fri Sep 27, 2002 12:32 pm

When I used inverse telecine on my video, as the video progressed, the audio would get farther and farther from the video it should be synced with. I understand that inverse telecine drops frames to make things look de-interlaced and whatnot, but then why is it suggested in Ermac's guide to use it? I've set settings identical to those in the guide, and I had the video problem I just spoke of (I did make sure that all of the timebase things were set to 24fps for that (and then to 23.976 after i had finished teh telecine). So, why did inverse teleceine screw up my video when I rendered it with that? (the video was normal without it (but with a lot more interlacing))
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Postby RadicalEd0 » Fri Sep 27, 2002 3:37 pm

what did you use for ivtc?

btw, your idea of ivtc is pretty off. Inverse telecine dosent really drop any frames, when anime is drawn its always scanned in as 24 frames per second film material (drawing in interlaced is really hard.. if not impossible). So, to be viewable on interlaced televisions, the frames are copied and meshed together and whatnot to generate pseudo-29.97 interlaced material. IVTC un-meshes and fixes this so that the video is returned to its original, full resolution, progressive, 24 fps state.
That has nothing to do with deinterlacing, deinterlacing just blends together interlace lines, causing ghosting, bad motion (depending on how you deinterlace) and low resolution.
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Postby Yogurtron » Fri Sep 27, 2002 5:02 pm

i just used TMPEG, and ran the inverse telecine filter dealy that's in the advanced settings. I first had it auto check it, then i went through it myself and manually trying to make sure all of the scenes didn't have interlacing. I did not used the dinterlace filter when i was doing the inverse telecine, just messing around with the frames.

If that's what inverse telecine does, then I'm really wondering, what am I doing on TMPEG when I click out a scene (chagne it from the red outline dealy, to not outlined). It sure looks like all I'm doing is dropping frames. But nonetheless though, how do I get the nice ability to get rid of ghosting and at least making the video look a lot less interlaced, with the inverse telecine?

(Btw, i'm Inverse telecining a 24fps file, trying to get it to be a nice 23.976 fps video).
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Postby klinky » Fri Sep 27, 2002 5:09 pm

IVTC is really meant for 29.97 > 24fps.

You're not going to have good results trying to do what you're doing.

If you video looks interlaced, which it really shouldn't if it's @ 24fps, then run it through area based de-interlacer(virtualdub plugin).

Hopefully you didn't start with a 29.97 footage, but setup Premiere to export @ 24fps :\


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Postby RadicalEd0 » Fri Sep 27, 2002 5:27 pm

ivtcing a 24fps file...
that would explain any sort of problem ur having :?
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Postby Yogurtron » Fri Sep 27, 2002 7:32 pm

...urg.... the way ermac's guide was set up, i thought i was supposed to export 24fps, and then change that from 24 to 23.976 fps. I guess I read it wrong.... shouldn't there be some manual to say what all these things do? i thought inverse telecine was for 24 to 23.976.... urg...

and I started out with 24fps footage from the Eva DVDs, at least as far as i know it's 24 fps (well.. 23.976, but whatever). It's for the most part not interlaced, but some parts it gets pretty bad.

So, for future reference, i should take dvd footage, export it as 29.97 footage from premiere, and do the IVTC then?

and for this version, i guess just use that area based de-interlacer for Virtual Dub, on the parts that i have a problem, i guess?
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Postby RadicalEd0 » Fri Sep 27, 2002 7:42 pm

whoa.. eva @ 24 fps? how did u get that?
eva is uberscrewed up when it comes to telecine. Gainax did such a crack job on this piece that u cant even come close to recovering the progressive frames. In this case, all you can do is deinterlace. Try something other than eva, itll be less confusing.

as for ivtcing your amv u have 3 choices
1. if you've got a large hard drive, encode all your source clips to a huffy avi and do the ivtc with decomb (find it on doom9.org) before encoding, so you'll have totally clean source clips to make your amv out of
2. if your editing through avisynth in premiere you can insert the ivtc right into the script and have it done on the fly as you edit, but that for me tends to feel like wading through molasses.
3. you can theoretically do your entire amv at 29.97 fps and then ivtc the master, although if you're using effects and such, I'd imagine it could screw up their motion and stuff. If you arent using any transitions or effects though, you should be okay.

I prefer 1 the best, because it isnt slow in premiere, and its the only other safe way to ivtc imo. But, whatever works for you.
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