NTSC 29,970 -> 23,976 fps, or PAL???

[kru]

I'm going to Encode a snowboard film, and I need some help to get the best quality:

Source settings:
-DVD
-4:3
-High motion
-NTSC Video (29.9 fps)
-33 min long
-Interlaced

Encoder settings:
-TMPGEnc (SKVCD settings)
-CVD resolution
-CQ

I very new at converting NTSC, I have always done NTSC -> PAL before.

To save bits to make the quality better I want to change framerate from 29.9 -> 23.9.
When I set DVD2Avi's NTSC field operation to automatic, the movie will be converted with 29,9 fps. If I set it to IVTC, the framerate is 23 fps.


My questions is:
-Is it right to set DVD2Avi's NTSC field operation to IVTC withthis source (Interlaced)???
-If this is wrong, how can I convert 29 fps -> 23 fps?
-If I use NTSC -> PAL, will the quality be worse/better than I use NTSC?
-Are there other important settings I got to know when i convert 4:3, Interlaced video?

[Wilbert]

-Is it right to set DVD2Avi's NTSC field operation to IVTC withthis source (Interlaced)???
Nope. You said it yourself. Your video is interlaced, and not telecined.

-If this is wrong, how can I convert 29 fps -> 23 fps?
You can't do that without introducing jerkyness, or messing up your video.

-If I use NTSC -> PAL, will the quality be worse/better than I use NTSC?
Worse, for the same reason above.

-Are there other important settings I got to know when i convert 4:3, Interlaced video?
I guess the most important issue is when using spatio-temporal / temporal filters. You have to separate both fields when applying such filters. See for example (last post of Kempfand):

http://forum.doom9.org/showthread.php?s=&threadid=63421