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From: kenb@amc-gw.amc.com (Ken Birdwell)
Newsgroups: comp.graphics,comp.sys.next
Subject: Re: Next machine as animation platform
Keywords: NeXTdimension, JPEG
Message-ID: <4072@amc-gw.amc.com>
Date: 14 Nov 90 19:01:56 GMT
References: <85866@tut.cis.ohio-state.edu> <JIM.90Nov13163758@baroque.Stanford.EDU> <2463@dover.sps.mot.com>
Reply-To: kenb@d9.amc.com (Ken Birdwell)
Distribution: usa
Organization: Applied Microsystems, Redmond, WA
Lines: 21


>talent@spanky.sps.mot.com (Steve Talent)

>The brochure states that you can do real-time video compression and
>decompression and store up to 60 minutes of live video on a high
>capacity hard disk (probably 1.4GB drive).  The compression factor
>is user selectable.  The brochure doesn't state any details about
>how these numbers were calculated.

I too was confused by these numbers.  But if you figure the a 24 bit 
image (640*480*3) takes a little under a meg (921600 bytes) then youre 
talking about (1400000000/921600) 1500 frames or about 50 seconds at 
uncompressed rates.  Since the compression rate in configurable, 
(but I heard that you have to go to 30:1 if you want to do realtime, 
something about bandwidth), you should be able to get about 25 minutes
of fairly good quality images (synthetic images will show a greater 
degradation than captured video)  and about 60 minutes at 72:1 , which 
I assume to be fairly low quality.


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