Encoding Source With both 5frame and 6frame pattern

[rcjc]

I have a ntsc dvd source where the first half has the regular 30fps telecine and the second half has a 000111 or 000011 interlace pattern (6 frame pattern where the 1 = interlaced).

if I ivtc to 24, the second half looks jerky.
would ivtc to 25 work? what kinds of options do I have if I want to use an avi container?

thx

[manono]

Hi-

With .avi you have to choose 1 framerate and stick with it, and you generally choose the higher of the 2. So, if it were I, I'd encode it at 25fps. There'll be a duplicate frame every second in the originally 24fps parts, but to my mind that's no big deal. I've seen similar things before.

From your description, the 25fps parts may be field blended which might create additional problems, but you didn't ask for help with that.

[rcjc]

thx for the reply

would a simple
telecide()
Decimate(cycle=6)
work?

or would something else need to be done to get to 25fps?

[manono]

Hi-

Well, that'll get it to 25fps (24.975fps), and also add Guide=3 to Telecide. But if there are blended fields, it may not be the right choice. Of the hundred or so PAL to NTSC DVDs I've seen, where there's 25fps inside of the NTSC 30fps DVD, exactly 2 have been "telecined" properly. That is, only 2 had 4 progressive and 2 interlaced frames in a cycle of 6 frames. Every single other one has been field blended. You say that some of it has 3 interlaced frames in a cycle of 6, so, naturally I'm a bit suspicious.

First I would try and determine if there are blended fields. I'd do that with either Leak's KernelDeint:

KernelBob(Order=1)

or with tritical's new TDeint (http://forum.doom9.org/showthread.php?s=&threadid=82264):

TDeint(Order=1,Mode=1)

If you don't see blends/ghosts when stepping through it, then Decomb or SmartDecimate should work fine. If you see blends, then you might be better off with RePAL or Restore24. Just my opinion though, not having seen the source material.

[rcjc]

thanks :)

seems like decomb is working out fine.