HD-DVD Gets Major Backing By 3 Studios.

[BJ_M]

yes there is ... it can be 30 or 24 fps

[Cornucopia]

Actually, according to SMPTE and ATSC, the following HDTV values are allowed:

1920x1080, 23.976p, 24p, 29.97p, 29.97i, 30p, 30i
1280x720, 23.976p, 24p, 29.97p, 30p, 59.94p, 60p

what you can't have currently (but may be allowed in the not-too-distant future) would be 1920x1080, 59.94p or 60p

(this doesn't include the 480p "EDTV" values)

They ought to know as they wrote the spec. Go to http://atsc.org for a look if you want.

Scott

[BJ_M]

with HD also -- you can go "outside" the ATSC specs .. which is done for many special use HD servers ..

i know -- since i use them ...

[edDV]

There is not 1080P in the DTV broadcasting spec (not enough bandwidth) but it will be part of the HDTV DVD spec and may show up in future cable standards. In fact 1080P already exists in the form of the WMV-HD 8Mbps High Def disks already in production (720P and 1080P versions on the same DVD).

http://www.wmvhd.com/

Microsoft's VC1 technology (as well as MPeg4 and H.264) is part of both the Blu-Ray and HD-DVD specs. Due to its higher compression, VC1 will help add hours to single layer discs and allow full 1080P DVD players.

http://www.linuxworld.com.au/index.php/id;477439239;fp;512;fpid;406

[Cornucopia]

There is no 1080P in the DTV broadcasting spec (no enough bandwidth) but it will be part of the HDTV DVD spec in fact it already exists in the form of the WMV-HD 8Mbps High Def disks already in production (720P and 1080P versions on the same DVD).

http://www.wmvhd.com/

There's not enough BW for 1080/60p, but there is for 1080/30p or 1080/30i. And they are being used.

re: WMV-HD discs,
They can put whatever they want on those discs, as there is yet no standard and it all has to be played through PC's, not CE equipment. HD-DVD and BLU-RAY seem to be putting some constraints on content already.

Scott

[edDV]

I edited my hasty post above but Microsoft VC1 is part of the Blu-Ray and HD-DVD standards. It is also being incorporated into uplink satellite tech. Dish, DirectTV, Voom and others are planning to switch to either VC1 or something similar to get more HDTV and SDTV channels in the same sat bandwidth. Likewise cable will be using VC1 or something similar to add more HDTV channels to cable.

[Cornucopia]

Forgive me if I was misunderstood. I wasn't saying WMV (VC1) wasn't going to be valid or part of a standard, what I was saying was that VC1 (or MPEG or H264, etc) will be muxed into the HD equivalent of a VOB file. And there will be certain constraints upon that HDVOB file, such as:

How many simultaneous streams?
Switchable FrameRates within a title?
Switchable Resolutions within a title?
Must simultaneous streams have same FR and Rez?
# of Audio, Subtitle/Graphic, or metadata streams?
# of "Video/Graphic Planes"?
What kind of Bit depth will Subpix graphics have this time?

HD files on disc currently don't have to worry about that stuff, but they will...

Scott

[edDV]

Yes, today it's about MPeg2 TS transit streams. It's about to get very complicated with VC1, H.264 and various metadata entering the mux.