Hi!
> From: Matto Marjanovic <[EMAIL PROTECTED]>
>
> I'm curious about the "progressive forbidden in DVD" thing.
Me too ;)
Unfortunately the official DVD specs cost big money (and an NDA
I believe) so we're left using other resources. The
DVD Demystified FAQ (http://www.dvddemystified.com/dvdfaq.html)
seems to be the best and most complete.
> On the other hand, there are all those "progressive-scan DVD players" out
> on the market, which I take it are generating a progressive output signal
> to be fed to an HDTV monitor. How does that work?
They deinterlace and generate progressive frames with some really
spiffy hardware chips.
http://www.dvddemystified.com/dvdfaq.html#1.40
"Progressive-source video (such as from film) is usually encoded on DVD as interlaced
field pairs that can be re-interleaved by a progressive player to recreate the
original progressive video."
> Aren't most movies on (NTSC) DVD encoded/stored at ~24 fps, and then 3:2
> pulldown/up magic is applied to decide what data should be sent out as
> the next field? Isn't such an MPEG-2 stream basically progressive, but
> with markers to indicate which fields to duplicate for upconversion to
> ~30 fps interlaced output?
This is where it gets interesting. How does one interpret
http://www.dvddemystified.com/dvdfaq.html#3.4
and the paragraph which reads in part
"MPEG-2 progressive_sequence is not allowed, but interlaced sequences can contain
progressive pictures and progressive macroblocks."
It seems you can have progressive pictures and tell the encoder it's
dealing with progressive input and to use 3:2 pulldown so the decoder
knows which fields are from the same frame. Something like that.
Apparently there's a difference between a "progressive sequence" and
"progressive pictures". I get so confused sometimes ;)
Cheers,
Steven Schultz
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