Ivtc Question

[David Kimble]

Hi! I'm encoding a season of the famous Series Bewitched for my DivX Player and I just realized after checking with FairUse Wizard that the video is TELECINED. I did not know this and did them all at 29 when it probably should've been 23 or other. According to FU Wizard it says it's telecined. Now I personally don't care about FU Wizard - i just use it for tests. How exactly do I deal with this if I'm doing it the manual way with DGIndex and VDub Mod/???
Should I check "force film" or honor the flags?
Also What should my Avisynth Script be?
Currently it's this:
LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\decomb.dll")
LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\UnDot.dll")
LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\DGDecode.dll")
LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\TDeint.dll")

Mpeg2Source("C:\ENCODES\S03E02 The Moment of Truth.d2v",cpu=6)

Tdeint()

BicubicResize(512,368,0,0.75)

Undot()

What's the Syntax or command for doing IVTC here???
Just curious...If you could post a sample portion of the required script I would be eternally grateful.
THANKS:) :p:script:

[Blue_MiSfit]

SEARCH! :) This has been answered thousands of times, but I'm in a talkative mood.

Ok.. Some basics:

1) Your content could be hard telecine, or just have pulldown flags. To check, load up the VOBs in DGIndex, and select "honor pulldown flags" mode. Then preview the video [f5], and let it run for a couple minutes. If the FILM percentage is high (over 90% or so) then it's "soft pulldown", which can be removed by selecting force film mode, and doing nothing special in AviSynth (force film returns 23.976fps progressive). This is very common on NTSC Hollywood movies / higher budget TV shows.

If on the other hand the FILM percentage is low, or it just says NTSC video, then you have so called hard pulldown, or perhaps true 29.97fps interlaced. Select 'honor pulldown flags', and then make a simple avisynth script like the following:

MPEG2Source("foo.d2v")


Open this up in Virtualdub, and step through the video frame by frame, preferably in a higher motion scene to make things obvious.

If you see a pattern of 3 progressive frames, and two interlaced frames, then you have hard pulldown telecined material, and you need to perform inverse telecine. If it's all interlaced, then you have true interlaced material, and you need to deinterlace.

Your script is fine for handling true interlaced material, but is not correct for performing IVTC. TDeint is a deinterlacer, and decomb.dll's telecide / decimate functions are for removing telecine. TIVTC.dll is also a good one, with TFM and TDecimate performing equivalent functions.

Hopefully your source will be soft pulldown, and will be force film friendly, as this is the fastest and easiest way to recover the true 23.976 progressive video!

~MiSfit

[setarip_old]

Hi!I did not know this and did them all at 29Have you played these, to see if you actually have a problem?

[David Kimble]

Thank You Blue MISfit
You've helped a lot- and I appreciate the advice.:thanks: :p

[foxyshadis]

It seems quite odd that a 60's television show would be telecined rather than pure interlaced. It's sure possible, and the quickest way to tell (besides the handy separate-fields method) is to attempt to Telecide/TFM and check whether one frame of every five is a duplicate. If not, it's probably pure interlaced, if so it's almost certainly telecined.

This might have changed during the switch from black and white to color in the 3rd season, too, concievably.

[ib84]

is there a way to detect hard telecine with *nix OSes? I am sitting on a ppc-mac / linux box and i would like to confirm that the input file (canon HV20 24p footage) is really hard telecined. no way in mencoder? i found some old post suggesting it is really hard to detect...

thankx for a hint

[Blue_MiSfit]

Just open up the file in any media player, and step through it one frame at a time.

If you see a pattern of interlaced / progressive frames - typically 3p/2i (3:2), then you know it's hard pulldown.

That's all there is to it :)

[chipzoller]

I've played around with the first couple seasons of this show, and if I remember correctly, some of them are soft-telecined (pulldown flags added) and some are hard-telecined. When running the episode in question through DGIndex, try to force film and see if it comes out right.

[Mug Funky]

@ foxy: US tv shows are almost all shot on film even now. at least those with a higher budget (this means no reality TV, or live broadcast obviously). if they went back to the negs that show should look pretty damn good...

and back in the 60's there wasn't much in the way of video tape storage... most of that stuff was "kinescope" recorded by pointing a 16mm camera at a CRT monitor... interlace and all.