Geoff Levner (g.levner++at++acsys.it)
Wed, 14 Apr 1999 14:30:08 +0200
libmovie reads movies from a single file -- is is possible to spread movie
data across several disks? Or would we need to store the movie in single
image files, and write our own application to read them in and feed them
to the graphics pipeline?
> Do you have any fibre channel disk arrays?
No, this is for a commercial product and we do not want to require that
customers buy a disk array.
> 640x480x3_8_bit_channels_RGBx25FPS = 23,040,000 bytes per second
The quantity of data is reduced considerably by compression, though. I
figured that if we used compressed movie data, we would not be limited by
I/O bandwidth, but as I said, compressed does not work very well either
(a bit better than uncompressed, however).
> 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.
Is there any compression hardware available for an Onyx2?
Thanks for your help,
Geoff
-- Geoff Levner -- g.levner++at++acsys.it ACS Studio, via Aurelia 58, 00165 Roma, Italy tel. +39-063936331, fax +39-0639363317
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