Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!wuarchive!sdd.hp.com!caen!hellgate.utah.edu!csn!ub!dsinc!bagate!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.multimedia
Subject: Re: CDTV Motion Video
Message-ID: <22384@cbmvax.commodore.com>
Date: 13 Jun 91 02:30:37 GMT
References: <30764@hydra.gatech.EDU> <1991Jun7.025704.21505@watserv1.waterloo.edu> <13967@goofy.Apple.COM>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 31

In article <13967@goofy.Apple.COM> lsr@Apple.COM (Larry Rosenstein) writes:
>In article <1991Jun7.025704.21505@watserv1.waterloo.edu> tcapener@watserv1.waterloo.edu (CAPENER TD - ENGLISH ) writes:

>>Actually, to be fair (fair?  who said we had to be fair?)  Apple's 24 minutes
>>of video is full screen and at 30 frames per second.  

What's more important to the question is, from where does the image originate?

>This sounds like a demo of Apple's 8*24GC graphics accelerator board, which
>is expensive but provides significant graphics performance.

Yeah, that puppy's driven by an AMD 29K at 40MHz or some-such.  Not too shabby
at all.  You need something like that to get any kind of motion video on a
large 24 bit display.

>What's more interesting is the recently-announced QuickTime, which provides
>something more like what you described for the CDTV.  (Small-size display,
>full-motion, 15 frames per second, more compression.)

Normal Amigas can handle 30FPS no problem from memory.  A3000s can do a pretty
decent animation from hard disk.  The CDTV problem is that CDs have a terrible
bandwidth, like maybe 1/30th that of SCSI.  So you figure, all things being
equal, 30FPS from hard disk equates to 1FPS from CD.  That's not moving.  So 
good compression is absolutely necessary to get anything moving from CD, even
in a window.


-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: hazy     BIX: hazy
	"This is my mistake.  Let me make it good." -R.E.M.