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- From: grege@chopin.asd.sgi.com (Greg Estes)
- Newsgroups: comp.multimedia
- Subject: Re: Video (from hard disk) to screen
- Date: 18 Dec 1992 00:27:22 GMT
- Organization: Silicon Graphics, Inc.
- Lines: 35
- Distribution: comp
- Message-ID: <1gr5taINNrr4@fido.asd.sgi.com>
- References: <SUHONEN.92Dec7104750@jalka.jyu.fi> <1338@taniwha.UUCP>
- NNTP-Posting-Host: chopin.asd.sgi.com
-
- In article <1338@taniwha.UUCP>, paul@taniwha.UUCP (Paul Campbell) writes:
- |> In article <SUHONEN.92Dec7104750@jalka.jyu.fi> suhonen@jalka.jyu.fi (Timo Suhonen) writes:
- |> >
- |> >Hi!
- |> >
- |> >I'm looking for a way to pack digitized video frames to hard disk and
- |> >further to show those packed files on screen (several pictures in second).
- |>
- |> >I have hardware to digitize video (a SGI 4D/310GTX with VideoLab) and I can
- |> >digitize video frame by frame. What is the best way to pack this information
- |> >to disk? The things we really need are:
- |>
- |> >Time for digitizing is irrelevant (less than 3 days would be nice). Number
- |> >of video frames to be digitized at time is something like 750 - 1000.
- |>
- |> >First I thought about Mpeg, but then I heard, that it only supports 320 x 240
- |> >pixels. We can't go to so low resolution ('cause we need those pictures for
- |> >an analyse, too).
- |>
- |> Buy a SuperMac 'Digital Film' board for a Macintosh (and get a fast CPU and
-
- (etc., etc.)
-
- As an aside, an SGI Crimson (not a 310) VGX can run ~30FPS full resolution
- uncompressed video from memory. So, if you can store the images in memory
- instead of a disk, upgrading from a 310GTX to a Crimson/VGX may be a better
- use of your money than starting all over on the Mac and going the JPEG path.
- This would also allow you to take better advantage of your VideoLab board,
- since the VGX graphics would get you all sorts of fun things, like writing
- moving video into texture memory to map on objects, etc.
-
- The disk performance is mainly gated by the speed of the SCSI bus.
-
- Greg Estes
- Silicon Graphics
-