On Wed, 28 Jan 2004, E.Chalaron wrote:
> Regarding frame rates for DVD, do I have to comply with NTSC or PAL frame
> rate.... or is it possible to use 20,18, 16 fps without the standalone DVD
> player going mad ? or mplex refusing mplexing
MPEG-2 allows from 23.976 (24000/1001), 24, 25, 29.97 (30000/1001),
and 30 (plus the couple other field rates of course). No others
need apply.
"Coded frame rates of 24 fps progressive from film, 25 fps interlaced from
PAL video, and 29.97 fps interlaced from NTSC ..."
DVD Demystified. The FAQ is online at
http://www.dvddemystified.com/dvdfaq.html
The book is very useful - I'm hoping the author comes out with an
updated 3rd edition.
#3.4 is where the video details are spelled out.
Actually I think the frame rates allowed for a DVD are a subset of
the MPEG-2 defined ones - and those are implemented in mpeg2enc.
mpeg2enc supports the MPEG-2 standards with:
(and you can see this with mpeg2enc -F 0)
0 - UNDEFINED: illegal/reserved frame-rate ratio code
1 - 24000.0/1001.0 (NTSC 3:2 pulldown converted FILM)
2 - 24.0 (NATIVE FILM)
3 - 25.0 (PAL/SECAM VIDEO / converted FILM)
4 - 30000.0/1001.0 (NTSC VIDEO)
5 - 30.0
6 - 50.0 (PAL FIELD RATE)
7 - 60000.0/1001.0 (NTSC FIELD RATE)
8 - 60.0
So things like 20 or 18 are NOT legal MPEG-2 (besides which they
can't be produced by mpeg2enc ;)).
Cheers,
Steven Schultz
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