[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: A SCENARIA FOR VIDEO



I am delighted that the folks at the Sarnoff Research Center are working
on a 
"video super computer" capable of supporting "25 simultaneous D1's in
and about 
50 D1's out."  The folks at Sarnoff are, obviously, a very smart bunch
and I 
applaud their design goals.  However, when last I talked to them this
machine 
was still in the development stage and they could not actually
demonstrate this 
capability.  If their machine is now capable of actually doing this I'd
love to 
take a look at it.

My comments were based on my real world experience with Silicon Graphics

computers.  We currently have a tricked out Onyx - 8 200 MHz processors,
500 
Megabytes of RAM, RM-5 graphics pipelines, a high speed disk array and a
SIRUS 
video I/O system - which SGI claims is capable of multiple streams of 
simultaneous CCIR-601 ("D-1") I/O.  My experience with this machine is
that 
simply getting one stream of real time CCIR-601 video in or out of it
taxes the 
machine to its limit.  

As for posting "unsubstantiated statements on the forum," perhaps I
should have 
qualified my statement as being based on real world, practical machines
that are 
capable of reliably functioning in a professional post production
environment. 
(Substitute the words "actually deliverable" for "currently exists" in
the 
paragraph in question).  In any case, I wrote the article as a reaction
to what 
I perceived as the incredible sales hype being spewed by manufactures at
the NAB 
convention.  I would ask you to look at the entire article - not just
that one 
paragraph - when framing your response.

Dean Winkler
E-mail:  Dean358 at aol.com
vox:   (212) 972-3400

 
________________________________________________________________________
_______
Subject: Reply Needed!
From:    BASIL
Date:    6/8/95  1:53 PM

Here's another one:
________________________________________________________
From: orton at earthlink.net (Mike Orton)
Subject: Re: A SCENARIA FOR VIDEO

At 10:24 AM 6/5/95, Herb Taylor wrote:
>On Jun 3,  7:15pm, Mike Orton wrote:
>> Subject: Re: A SCENARIA FOR VIDEO
>> At 1:57 PM 6/2/95, Basil_Pappas at avid.com wrote (for Dean Winkler):
>
>> First, the bandwidth required to simultaneously play back several
>> sources of uncompressed, real time component digital video and audio
is
>> too large for any single computer/disk system that currently exists.

The reply from Sarnoff Corp just goes to show that you cant get
 away with unsubstantiated statements on the forum! This one was
 easy to debunk!!!
Below..............



>  Sarnoff Real Time Corporation is a new 30 person commercial spin-off
from the
>David Sarnoff Research Center. We are commercializing a "Video
Supercomputer"
>we have developed here since 1983. - that
>is sufficient for 25 simultaneous D1's in and about 50 D1's out. All
I/O
>operates SIMULTANEOUSLY.


Thanks to Herb Taylor  at  Sarnoff for providing this information,
 I for one had not heard of this development.

MIke O.


> At 1:57 PM 6/2/95, Basil_Pappas at avid.com wrote:
> >                                               A SCENARIA FOR VIDEO
> >
> >                                                             by
> >
> >                                                    DEAN WINKLER
> >                                             President, Post Perfect
NY
> >
> First, the bandwidth required to simultaneously play back several
> sources of uncompressed, real time component digital video and audio
is
> too large for any single computer/disk system that currently exists.
> Second, the computing power required to execute all of the real time
> functions of an on line editing system in software is far beyond the
> capabilities of even the fastest existing supercomputer. 
> And third, pull down menus or similar CRT based controls will never 
> be ergonomically fast enough. Some type of physical controls 
> (e.g., switches, shaft encoders, lever arms,  etc.) will continue to
be
> required.
> 
> Sorry to disappoint you, Basil and Dean, but the SGI Challenge 
> server fulfils at least one of these criteria by having a backplane 
> bus bandwidth of around 2.2 Gbit/s. This is enough internal bandwidth
(assuming 
> you can get it out of the machine) for almost 10 
> simultaneous D-1 channels. I suspect that this would be more 
> than enough for the most hairy component edit session.
>    The answer to your second problem will undoubtedly be solved 
> by multiple processor arrays of the "Transputer" variety. Something 
> along these lines already exists in the Quantel Henry/Hippo package, 
> which makes a valiant attempt at executing those very functions 
> you mention in something nearing real-time, right now. The 
> third criterion is a given, especially to the readers of 
> this forum, who are used to having color correction controls 
> which can manipulate 6 different things at once (if you use both 
> hands). This kind of interface will be a requirement for any 
> workstation based color corrector, until the direct cranial interface 
> is designed! 
> To conclude, I beg to differ on your first two pessimistic points. 
> This technology clearly already exists in many fragmentary areas. 
> All that is needed is the vision to produce a whole which is 
> greater than the sum of the parts.
> 
> 
>