On Wed, 13 Sep 2006 08:36:04 -0700, Phil Ehrens wrote: >> not a valid DVD frame rate: 24000.0/1001.0 (NTSC 3:2 pulldown converted >> FILM) > > Same problem here, I could never figure out how to get 24fps to work on an > NTSC dvd either, though it would be great to be able to. ...
Found a good reference at http://www.allformp3.com/dvd-faqs/34.htm Seems quite complicated. Here is the extract: ,----- | ... MPEG-1 CBR and VBR video is also allowed. [...] NTSC, 29.97 interlaced | frames/sec and PAL/SECAM, 25 interlaced frames/sec video display systems are | expressly supported. Coded frame rates of 24 fps progressive from film, 25 | fps interlaced from PAL video, and 29.97 fps interlaced from NTSC video are | typical. MPEG-2 progressive_sequence is not allowed, but interlaced | sequences can contain progressive pictures and progressive macroblocks. In | the case of 24 fps source, the encoder embeds MPEG-2 repeat_first_field | flags into the video stream to make the decoder either perform 2-3 pulldown | for 60Hz NTSC displays (actually 59.94Hz) or 2-2 pulldown (with resulting 4% | speedup) for 50Hz PAL/SECAM displays. In other words, the player doesn't | "know" what the encoded rate is, it simply follows the MPEG-2 encoder's | instructions to produce the predetermined display rate of 25 fps or 29.97 | fps. This is one of the main reasons there are two kinds of discs, one for | NTSC and one for PAL. `----- T
