Encoding with wrong fps

[tominator]

Hi
I usually encode from PAL to 25fps wmv. I just got an NTSC-DVD and without thinking I encoded this in 25fps also.

I can't really see anything wrong with the encode. What actually happens when I encode with incorrect fps?

I read that I have to perform ivtc in order to make my encode as good as possible. Does anyone have any input regarding if this is actually worth the extra effort?
This is what I read: http://www.pocketmatrix.com/guides/dvd2divx/ivtc.htm

[CWR03]

I can't really see anything wrong with the encode. What actually happens when I encode with incorrect fps?
It just plays at a slightly increased speed.
I read that I have to perform ivtc in order to make my encode as good as possible.
You only need to perform IVTC if it's needed. Pretty much all movies in NTSC can be encoded straight to 23.976 FPS. A lot of TV series that were originally filmed are telecined on disk and need IVTC. There are plenty of ways to determine if it's needed which have been mentioned here before.

[tominator]

You only need to perform IVTC if it's needed. Pretty much all movies in NTSC can be encoded straight to 23.976 FPS. A lot of TV series that were originally filmed are telecined on disk and need IVTC. There are plenty of ways to determine if it's needed which have been mentioned here before.

I've tried to find info on how to see if ivtc is needed but can't seem to find it on the forum.

I found this:
http://www.doom9.org/index.html?/mpg/tmpg-ivtc.htm

But I can't see that it says how to determine whether or not ivtc is needed. A link to such information would be much appreciated.

[Guest]

Use SeparateFields() to step through the fields in a high motion sequence (use Honor Pulldown Flags if serving via DGMPGDec). If you see a pattern of 3 duplicate fields followed by 2 followed by 3 followed by 2 ..., then you have 3:2 pulldown and can apply IVTC.

[tominator]

Use SeparateFields() to step through the fields in a high motion sequence (use Honor Pulldown Flags if serving via DGMPGDec). If you see a pattern of 3 duplicate fields followed by 2 followed by 3 followed by 2 ..., then you have 3:2 pulldown and can apply IVTC.

Thanks but Im afraid but Im not sure what program youre talking about. Do you mean TMPG?

[Guest]

Thanks but Im afraid but Im not sure what program youre talking about. Do you mean TMPG? Nope. I meant what I said. You use the SeparateFields() filter in Avisynth. If your source is MPEG and you are opening it with DGMPGDec, then use the "Honor Pulldown Flags" option when testing for telecining.