🚀 go-pugleaf

In article <815765261snz@c4rv.demon.co.uk>
           raj@c4rv.demon.co.uk "Rajesh Varia" writes:

> In article <815753545snz@longley.demon.co.uk>
>            David@longley.demon.co.uk "David Longley" writes:
> 
> > I'm very grateful for the technical hints and explanations I have received
> > in the past on this matter (especially from JB). So I'm hoping that someone
> > will be able to explain what acounts for the following:
> > 
> > System: Pentium 120 CPU
> >         16MB EDO RAM
> >         Stealth 64 2MB VRAM PCI
> >         Miro DC1TV Video Capture/editing ISA Card
> >         Conner 1.2GB EIDE drive
> >         Premiere 4
> > 
> > The problem is that when capturing from VHS or live TV, I'm not getting a
> > realime 'speed' display in the 'full window' (about 1/3 screen). It jerks.
> > If I try and select 1/2 or 1/4 size screen, I get negative colours!
> > 
> > I thought a faster CPU/raphics card would make a difference to the 486-DX
> > basd system, but it doesn't seem to..
> > 
> > -- 
> > David Longley
> > 
> Hello David (again),
> 
> I've mention this before, if you still having trouble with your video
> capture I suggest that you ring Graphics Direct on 01635 873000.  They
> sell your video capture board and should be able to sort out your problem.
> 
> 
> --
> Rajesh Varia     raj@c4rv.demon.co.uk
> 
I appreciate the advice (and will follow it up tomorrow - do you also have
a number for Miro?) but I'd also be interested in a technical discussion
of these issues. For example, the Miro DC1TV does 320 x 240 as half PAL
(why)? If you use full colour, at 25 fps, that gives:

  320 x 240 x 15 x 24    =  27,648,000 bits per second
          or             =  3,456,000 bytes per second

Now that's a lot more than the speed which the data is going to disk,
which is less than 1MB a second.

Can a DS 64 2MB VRAM put that sort of data to a monitor at that speed?
Will a pentium 120 MHz be fast enough? Etc etc. What I would very much
like is some computational discussion..
-- 
David Longley