DOUGLAS_MASHEK++at++udlp.com
Wed, 14 Apr 1999 10:17:19 -0500
I have been doing this pretty well on my Onyx2. If the movie is computer
generated, it should not be too hard because it is so compressable. I have been
shooting for 3840x1024 ++at++ 10fps.
I have been able to do 3840x1024 ++at++ 4.5fps with a single process. I have an
Onyx2 IR w/4x250MHz processors 2RM7s, and a dg5-8.
The first thing you must consider is compression. Because I am playing back
computer graphics, I have been able to realize 15:1 lossless compression of each
image. If your content is more "analog", you will not be able to do as well.
For a compression algorithm I compress using RLE encoding all 3 colors at a
time. That way the images take less time decompress.
I have been using just OpenGL calls, and some of my own routines, and some of
the rgb routines from Developers Toolbox.
I am by no means a programming wizard, and I don't really know performer or much
OpenGL, but I have been able to hack some things together.
I wouldn't mind collaborating with some other folks on this if my boss
doesn't mind. I will check with him about sharing information. Please get back
to me directly if you are interested.
Thanks,
Doug
____________________Reply Separator____________________
Subject: Re: movie playback on Onyx2
Author: Mike Krus <Michael.Krus++at++der.edfgdf.fr>
Date: 4/14/99 2:58 PM
Hi,
we are looking into doing that kind of thing also...
> Brian Furtaw wrote:
> > A SCSI disk controller can stream 20mBytes per second peak flow so we are
> > talking a minimum of two controllers. Better performance can be had by
> > stripping the data across several disk drives but you are still going to
need
> > two disk controllers. Do you have an MSCSI card or JPEG compression
hardware. A
> > cosmo compression card could get you down to one controller but it only runs
on
> > Octane.
using that card, do you think it would be possible to display a 1024x768
movie full screen?
Right now, it looks like you need either expensive disks or expensive
VCR+video card...
Mike
--
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From: Mike Krus <Michael.Krus++at++der.edfgdf.fr>
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Subject: Re: movie playback on Onyx2
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