Re: movie playback on Onyx2

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Brian Furtaw (brian++at++dingbat.clubfed.sgi.com)
Wed, 14 Apr 1999 21:44:43 -0400

On Apr 14, 2:58pm, Mike Krus wrote:
> Subject: Re: movie playback on Onyx2
> 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?

I believe the cosmo compression card can in real-time encode or decode two
streams of NTSC/PAL video. I am trying to find the product literature to
confirm this, it doesn't use my words exactly but as long as it is coming from
memory or video card it can compress in realtime. So with those two streams you
could come close to your goal of 1024x768. The card has the ability to compress
imagery of sizes up to 4Kx4K in non real-time.

>
> Right now, it looks like you need either expensive disks or expensive
> VCR+video card...

1024x768 x 3 channels RGB x 30Hz = 70,778,880 bytes/sec thats a lot of data.
But SGI systems have superior IO bandwidth capabilities so its possible. You
could also consider a lower resolution say 512x512 then specify the video data
as a texture and play it on a 1024x768 polygon. Let the texture engine create
the extra data for you in real-time.

Brian

>
> Mike
>
> --
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>-- End of excerpt from Mike Krus

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