DVD to VCD Conversion w/Different Frame Rates

[RevyJay]

I'm wondering if anyone else has ran into this DVD to VCD conversion problem. I've ripped the movie with SmartRipper, and converted the movie to VCD. About 30 minutes into the movie, it changes from 23.976fps to 29.976fps. After another 30 minutes, it changes back to 23.976fps. I've posted this same question about 3 months ago, but no one had seemed to have seen this before. Has anyone seen this yet, and how did you overcome the rate changing?

[stanwebber]

your question is vague. how did you determine the framerate changed & where? on the dvd? vcd?

[RevyJay]

I first noted it on the VCD. The movie played fine, then got choppy (like it was missing frames), and then went back to normal. So then I looked at the frame type (usually Progressive frames are 23.976 and Interlaced are 29.976), and sure enough, where the movie starts jumping, that's where the Interlaced frames kick in. When the Interlaced portion of the movie stops, that's where the movie becomes normal again. I also noticed that the total number of frames did not equal what they should. Figuring at 23.976fps, I should have 129470 TOTAL frames. SmartRipper says I have 140269 TOTAL frames. Basically, I have 10800 frames that are extra. Well, when you figure that 30 minute segment at 29.976fps, and the remaining 60 minutes of movie at 23.976fps, you get 140270 frames, just like SmartRipper said.
All in all, I'm trying to figure out if there is a way that when the movie is being converted from DVD to VCD, is there a program out there that will automatically change frame rates with the DVD? I know I can make the entire movie at 29.976fps, but the picture quality is lost becuase of the ghost frames that the program has to fill in.
Does this help a littler more?

[poopyhead]

well..technically, w/ 3:2 pulldown those 23.976 fps frames still plays back as 29.97 fps...

with dvd rips, you can only encode 1 type of fps on your dvd rip...thus, if ANY part of the movie is NTSC, interlaced...you have to treat the entire movie as NTSC, interlaced.....turn off force film in dvd2avi and use the NTSC template (not NTSC FILM template) in tmpgenc

for example, when i ripped man in the iron mask, the entire movie was very close to 99% FILM...however, for like 5-10 min of the movie, it went down to 95% FILM and acted like it was nearly NTSC, interlaced.....when i encoded the movie as FILM, that part of the dvd rip was really jumpy and had interlaced lines everywhere...thus, i had to treat the entire movie was NTSC, interlaced

[RevyJay]

Thanks. I'll have to try that.

[adam]

If you don't mind the extra encoding time you should enable the inverse telecine filter in TMPGenc and encode at 23.976fps with the 3:2 puldown rather than encode at 29.97fps interlaced. This will prevent possible interlacing problems as well as gain you that extra %20 bitrate that you save encoding at ntscfilm.

[stanwebber]

your source is either partially hard-telecined or hybrid(film+ntsc). forced film will not work here. as suggested you need to inverse telecine to reap the additional 20% bitrate benefit. in the case of hybrid sources you will need to frame-decimate the 29.97/30/60(progressive blend)fps portions. if this tradeoff is acceptible to you i suggest using decomb without pattern guidance to achieve the smoothest transitions during frame-decimated scenes