Xref: utzoo comp.sys.mac.hardware:2503 comp.sys.mac:51399 rec.video:11365
Path: utzoo!attcan!uunet!cs.utexas.edu!yale!think!snorkelwacker!apple!jrg
From: jrg@Apple.COM (John R. Galloway Jr.)
Newsgroups: comp.sys.mac.hardware,comp.sys.mac,rec.video
Subject: MacII and video editors and compressors, is 48 to 1 possible?
Keywords: video compression macII
Message-ID: <39830@apple.Apple.COM>
Date: 26 Mar 90 14:33:26 GMT
Organization: Galloway Research
Lines: 25


	Recently I saw on some PBS computer show (The Computer Cronicles I
think) an issue on desktop video.  They had a piece on a very high end
MacII based video editor (about $80K) though no mention of what extra hw
it was using (and I do not remember the manufacturer).  You read in your
tape (looked like std VHS) did all the editing from disk, then made a new
tape.  The claim was that it took 600MB of disk to store 20 mins of video.
At 30 512 by 512 by 24 (full) frames per second thats only 16KB per (full)
frame or a compression ratio of about 48 to 1.  Just for the editing process
you could drop every other line, and then known 20-25 to 1 compression parts
would make it, but to produce the final tape you would want full info, which
also would have to come from disk I would think.  Is 48 to 1 possible?  Is this
likely just false information?  Does anywone know the name of the manufacturer
of this beast?
	On the same show (FYI) another company displayed a MicroChanel board
that did real time full color video (with sound) display in a MSWindows window,
including real time scaling/interpolation to ANY size.  All with no host cpu
interaction, other than window/mouse actions.  Very impressive.  So when is a
MacII version comming?
-- 
internet   jrg@apple.com      John R. Galloway, Jr.
applelink  d3413              CEO..receptionist
human     (408) 259-2490      Galloway Research

These are my views, NOT Apple's, I am a GUEST here, not an employee!!