MPEG1 @ 23.976fps to DVD

[AlanHK]

I've taken MPEG1s from many VCDs and used them to author DVDs; (demux, resample audio to 48k).

However, they were all either NTSC 29.997 fps or PAL 25 fps.

I just ran into a problem with one that's 23.976 fps. I didn't know that was possible, but the VCD played without a problem.

I thought that to make it DVD compatible I'd just run the video through DGPulldown. However after authoring with GuiforDVDAuthor the video was sped up (about 29.997/23.976).
Perhaps DGPulldown doesn't work on MPEG1 correctly, though it gave no error messages.

How should I handle the video, (without reencoding)?

[jman98]

According to the DVD specs here at this very website, 23.976 with pulldown is only supported for MPEG-2 video. Mabye that's the problem.

Would you mind telling me what VCD you have that has 23.976 fps? Although I know that VCD supposedly supports this, I've never seen that and I would be interested in buying a copy if it is a commercial VCD.

[AlanHK]

According to the DVD specs here at this very website, 23.976 with pulldown is only supported for MPEG-2 video. Mabye that's the problem.

Yes. Since I posted I've found a few posts around, but the only "solution" found was reencoding, which I'm loathe to do. It seems like there should be a way to fake some headers to make it an ersatz MPEG2.

Would you mind telling me what VCD you have that has 23.976 fps? Although I know that VCD supposedly supports this, I've never seen that and I would be interested in buying a copy if it is a commercial VCD.

"Harry Potter and the Sorceror's Stone", HK edition with Chinese subtitles. A few years old, probably not on sale any more. It's 3 VCDs, so I wanted to make it a single DVD.
I've never noticed one at film fps either.

[AlanHK]

I fed the file to SVCD2DVDMPG to see how it handled it.
It simply demuxed the video and converted the audio sampling, and made no change to the fps.

So despite being out of spec, I just tried authoring the 23.976 m1v file.
GuiforDVDAuthor accepted it and went ahead, but generated many warnings when compiling the VOBS.

When burned the DVD was playable, with sound in sync; but time display was way off, showing e.g. only 1h12m at the end instead of 2h24m. But I can live with that; seems preferable to reducing quality by reencoding.

So unless anyone has a better idea, I'll just go with this.