Question about Progressive video

[hizzy7]

Hi Video Kings!

I have a question for you that has me a bit puzzled. I have a dvd which i am fixing up, and mediainfo and DGindex tell me it is progressive, but when I play it in virtual dub, I see combing, and what looks like 3:2 pulldown (three nice frames, followed by two combed ones). Does this mean my video is not really progressive?

Thanks!!

[johns0]

Upload a small clip so we can see what it is.

[hizzy7]

Here you go!

http://files.videohelp.com/u/183506/furious.demuxed.m2v

Many thanks!!

[poisondeathray]

It is "soft pulldown"

This means file content is progressive, encoding is progressive, and pulldown flags cause field repeats to output the 29.97 signal for DVD, from 23.976 . This is "normal" for most modern theatrical DVD's shot on film (or digital film equivalents)

To get the original 23.976 "film" frames back, you just IVTC . Or you can use "force film" if you are using avisynth with DGIndex

[hizzy7]

Would I use "TIVTC" to perform the IVTC?

Thank you so much! This had me mystified!

[poisondeathray]

Yes , you can use TIVTC, or any method of IVTC.

[manono]

Would I use "TIVTC" to perform the IVTC?

You could. It's an AviSynth IVTC filter. tritical's IVTC.

Or, as pdr mentioned, if the whole thing is soft pulldown you could make your D2V project file made using 'Forced Film' and get a progressive 23.976fps video when the D2V project file is used in an AviSynth script. Then no further IVTC would be required.

Oops, too slow.

[hizzy7]

That is is a neat trick, manono!

If I wished to use TIVTC, would I first:

1) Figure out the field order, and then use AssumeTFF() or AssumeBFF()?
2) Then load TIVTC.
3) then use TFM & then Tdecimate?

Thanks again!

[Skiller]

1) Figure out the field order, and then use AssumeTFF() or AssumeBFF()?

DGDecode (MPEG2Source) passes the correct field order automatically.

[johnmeyer]

If the VOB is truly 23.976 progressive, with soft pulldown flags, I don't see any reason to use IVTC. You just need to rip it from the DVD correctly so that the flags are stripped out. If you do it right, there is no re-encoding required.

I have used TIVTC hundreds of times on film DVDs that were (unfortunately) encoded with hard telecine (actual 3:2 pulldown in the video, rather that with flags that cause the DVD player to add the pulldown). However, for film DVDs that are correctly encoded (without hard-coded fields), I just rip the VOBs, usually to a single VOB, and then use it directly.

[hizzy7]

Thank you all for your help!!!