DVD Standard support 23 FPS?

[DJRumpy]

Does anyone know if the DVD standard supports 23 frames per second, or is it all 29.97 (ntsc, 25Pal)? I've got a few files to convert, that are in 23fps (film).

Another question, can I expect a drop in quality, or the jerks if I up their framerate to 29.97?

Does anyone have any suggestions for doing this outside of TMPGenc (too slow). Is there a filter in Virtual Dub for this?

[SLK001]

If you simply apply a "pulldown" on your 23.976fps films, you will arrive at 29.97fps - a DVD standard framerate.

[DJRumpy]

Sorry, but I'm still new to some of this. So the Pull DOWN Filter in Virtual Dub will UP the frame rate? (who makes this stuff up?)

When you do a pulldown, does it change the length of the video? Will it introduce sync problems with audio when I re-mux the video and audio?

Also, are the extra frames just clones of other frames, or extrapolated somehow?

[DJRumpy]

Nevermind the original question. I just answered my own post. 29.97 FPS only for NTSC.

What can I expect if I change the framerate from 23 to 29.97? I usually demux my files and work on each seperately. Will I have sync problems because of this? Logically I would think the audio still fits, since they are only cramming more frames into a second, but a second is always going to be so long. Can a pulldown be done with Virtual Dub?

[adam]

DJRumpy the "pulldown" is a flag. Its called a 3:2 pulldown flag or on dvds its called a RFF/TFF flag. The video is still 23.976fps but when the dvd player plays it it telecines it in real time to 29.97fps so that it will comply with the ntsc standard.

This is much higher quality than actually encoding in 29.97fps because at this framerate, you have %20 more frames and that takes up bitrate. By ecoding in ntscfilm (23.976fps) and using a pulldown flag you literally increase quality by %20.

So do what SLK001 suggested and run your video stream through pulldown.exe to add the 3:2 pulldown flag. Your video will not change at all but it will be properly played back on your dvd player, either hardware or software.

Svcds work the exact same way, with a flag. Vcds require no flag, the dvd player should auto telecine them.

[DJRumpy]

Thanks Adam. Where can I get the pulldown.exe executable, or is this something I can do with IFOEdit?

::Edit::
It looks like I would need the pulldown.exe, since I'm using CCE to encode. What package does it come in?
::Edit

[liquid217]

http://www.vcdhelp.com/tools.htm#other

[DJRumpy]

Thanks Liquid217. I didn't look hard enough.

If anyone else is interested, I found a very good guide describing 3:2 pulldown, interlacing, telecine, 2:2 pulldown, etc.

They are probably some of the best I've seen as far as getting the basic idea across. They even explain mpeg compression in laymen's terms.

http://www.divx.com/support/guides/index.php