IVTC questions

[ErMaC]

First off, don't use the Force FILM option in DVD2AVI because on 95% of anime DVDs it will not produce a stream which is really progressive.

Instead what you want to do is in your AVS script, include the lines that I talk about in my DVDGuide to IVTC - the ones that use DeComb. DeComb will IVTC in realtime as you work.

And BTW - the reason why, when you're in DVD2AVI itself, it doesn't go 1 frame at a time is because the < and > arrows are moving between GOPs, not frames. Whenever you make a cut with the [ or ] buttons, it must be done on a GOP, and so the author just made the < and > buttons scan between the start of GOPs.


Now your other problem is editing with that 23.976fps footage in premiere. The biggest problem you will face is that Premiere does not support 23.976FPS! It will suppoer 23.98, or 24, but it cannot measure FPS into the thousandths place. What you should do is add the following line into your AVS script:

AssumeFPS(24)

This will basically set the framerate bit on the video to be 24fps, thus speeding it up by .1% but giving you an even framerate. Why 24 and not just 23.98? Well Premiere also has this thing called a timebase - and Premiere has timebases for 30fps, 24fps, and 29.97fps - but not 23.98 - but means that if you edit in 23.98fps and set your timebase to 24, your previews will look out of sync because your framerate is losing sync with the timebase (the timebase measures what frames go where on the timeline, or the distance on the timeline that each frame should take up). By working in 24 you maintain parity between the framerate and timebase.

However this leaves those of us with TV as our desired destination in a quandry. How will we get 24fps back into 29.97FPS? The best way I came up with was to shrink your audio ahead of time.

Open up your WAV file in SoundForge and do a TimeCompress/Expand and change the length of your WAV file to be exactly 99.9% of its original length. Or, if you do not have soundforge and want a free version, us BeSweet and its GUI which can adjust audio to compensate for framerate differences. I've never tried this but AbsoluteDestiny has said that it does work and he's the authority here on audio so I'd ask him to elaborate.

Anyways, once you've got this shrunken WAV file, you can edit with that in your 24FPS timebase. Then once you're done, export it without audio, merge your original audio in with virtualdub (by going WAV Audio) and then under VDub go "Change Framerate" and select 23.976. This will then have your audio and video back in sync, and tada! you can then Telecine it back into 29.97fps.

This is the exact process I used to do Evil Light version 2, which was edited all in progressive with the audio stretch method.

[klinky]

ahh yes..ermac the smarty smarty man..




~klinky