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Path: utzoo!mnetor!seismo!uwvax!astroatc!philm
From: philm@astroatc.UUCP (Phil Mason)
Newsgroups: rec.video,comp.graphics
Subject: Re: Consumer-Grade Single-Frame VTR's
Message-ID: <339@astroatc.UUCP>
Date: Thu, 25-Jun-87 19:33:37 EDT
Article-I.D.: astroatc.339
Posted: Thu Jun 25 19:33:37 1987
Date-Received: Sat, 27-Jun-87 05:34:35 EDT
References: <846@ssc-bee.ssc-vax.UUCP> <180@cerebus.UUCP>
Reply-To: philm@astroatc.UUCP (Phil Mason)
Organization: Astronautics Technology Cntr, Madison, WI
Lines: 33
Xref: mnetor rec.video:1297 comp.graphics:850

In article <180@cerebus.UUCP> ronc@cerebus.UUCP (sysadm) writes:
>It occurs to me that an eight frame burst is actually a better idea
>than single frame recording as it provides much more redundancy per
>"frame", and probably averages the noise caused by starting and stopping
>the tape over several frames.

If eight identical frames is the smallest unit you can write on the
tape, you get an effective 7.5 frames per second - not very impressive
unless you can run the tape at somewhere between 4 and 8 times the
recording burst speed.

If the deck will record a burst of eight non-identical frames and you are 
trying to use the deck as output for normal speed computer animation, 
even if your computer can sequence the desired images at the video output 
fast enough, you will run into the severe sychronization problem of 
getting your computer to run eight frames of pictures AT SPEED into the 
recorder in SYNC. 

I am not saying that it can't be done, but the 30 second wait is the 
real killer if you want to make sequences of any length quickly.  I guess
if you lick the synchronization problem, the speed of any graphics 
software running out there is slower than 3 and 3/4 seconds a frame 
(taking into account the speed of recording and the 30 second wait).

The deck must have some kind of 'burst record sync' output in order
to be useful at all.


-- 
Kirk  : Bones ?                |  Phil Mason, Astronautics Technology Center
Bones : He's dead Jim.         |  Madison, Wisconsin - "Eat Cheese or Die!"
...seismo-uwvax-astroatc!philm |  I would really like to believe that my
...ihnp4-nicmad/               |  employer shares all my opinions, but . . .