Random IVTC?

[Golem]

I just got finished ripping a few scenes from DVD. Overall it seemed, as most do, to be a perfect candidate for IVTC (3 clean / 2 combed etc.). After encoding to DivX 640x480 using VDubs internal IVTC filter it seems to have a very random single frame comb. It will be seen at intervals such as 32-12-78-40-102 etc from comb to comb effect.

Could this be one of those requiring a manual value adjust to the field reconstruction or should I be looking at something else altogether? I have applied no other filters to this clip.

Regards,
Golem

[menace]

anything I have read seems to indicate that you are stuck with that irregularity as the IVTC algorithm made poor selections during the process. Apparently Tmpgenc's version does about the same job but it has a whole bunch of other features that I am trying to find out about to alleviate that. Avisynth also has one by the name of decomb that is supposed to be more intuitive but I have yet to try it. This seems to be the holy grail of IVTC--find a program that doesn't muck it up!

[SLK001]

But why are you trying to IVTC a DVD anyway? Most likely, all you need to do is use FORCE FILM in DVD2AVI to get back to 24fps. Or, rip your section off the DVD, then use PULLDOWN and REMOVE all the RFF flags (check the options - it's there).

[Golem]

LOL, yeah menace, but there seems to be no real Holy Grail when it comes to anything PC video related...even though we rack our brains endlessly!

SLK001, since I tend to rip quite a few of my favorite scenes I have leaned towards editing VOBs directly in VDub. This allows me to bypass both DVD2AVI and VFAPI. Seems to work fine on all of the ripped clips so far but this one was being a bit difficult. Guess I'll reinstall both these apps (formatted and did a clean reinstall recently) and give it a try. VDub's internal IVTC filter works so well on captured video that it's hard for me to believe that herein lies the problem. I'm probably missing the reasoning somewhere though...I've been known to overlook!

Thanks for both of your replies!
Golem

[vhelp]

hi Golem.. and others,

If you're that adimate about vdub, instead of using dvd2avi for it's built-in
IVTC job.. then perhaps all is not lost after all..

You CAN STILL use the docomb.dll IVTC filter (used in AVIsynth) .. ..here
is how..

* load your VOBs into your vdub
* don't do anything editing (unless you really need to)
* save as a *.vdr file (think you have to rename as .AVI for AVIsynth)
* then load that into AVIsynth script
.. and use the IVTC filter there, then you..
* NOW, take that script, and re-dump it back into vdub he he...
.. no need to use vdub's IVTC filter.

And continue on doing your edits and things in vdub. Enjoy.
You can now make the determination of which is the best IVTC filter for
your encodes.

Have a good evening.
-vhelp

[Golem]

Hmmm...I've tended to shy away from AVIsynth up to now, I'm a GUI kinda guy! I'll fire it up though and give it a try.

Many thanks for the step-by-step walk-through.

Regards,
Golem