On Wed, 20 Feb 2002, Paul Schauble wrote:
Let’s see
640 X 480 X 4 bytes/pixel X 120 frames/second = ~400 MB/sec
O_O.
640 * 480 * 4 * 120 bytes/sec
640 * 480 * 4 * 120 / 1024 * 1024 Mibytes/sec
140 Mibytes/sec
Just beyond PCI32/33’s theoretical limit, but well within AGP 1x’s range.
Why do you need 120 frames/sec when the human eye can’t perceive much over
30 at best?
It depends entirely on what you’re looking at and in what conditions.
Around 25 motion-blurred frames per second is what you need to maintain
the illusion of movement. If you don’t have motion blur, you’ll tend to
need a higher framerate.
++PLS
-----Original Message-----
From: Max Paklin [mailto:xxxxx@yahoo.com]
Sent: Wednesday, February 20, 2002 7:16 PM
To: NT Developers Interest List
Subject: [ntdev] Re: How to achieve higher frame rate WDM Stream classs
mini driversI would guess that data rate is too high for whatever bus you push it
through. It could also be that video card performance is insufficient to
handle data rate in question.Just in case make sure that maximal data rate you specify in
VIDEOINFO/VIDEOINFO2 format structure for corresponding stream is
sufficient to cover worst case scenario. I don’t think it’ll help though.Max.
— “Srikanth.R.K.” wrote:
> > Hi,
> >
> > I have developed a stream class mini driver, which talks to bus drivers
> > for
> > getting video data. In this case, I have a specific need in which I need
> > to
> > achieve upto 120 frames/second in 640x480 display mode. Till now, I am
> > unable to do so. I am able to achieve around 120 frames/second ONLY in
> > 160x120 video mode. As the frame size increase, the frame rate decreases
> > drastically.
> >
> > Can anyone let me know how to achieve higher frame rate (120 frames/sec)
> > in
> > 640x480 video mode?
> >
> > Thanks
> > Srikanth.R.K.
> >
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–
Peter xxxxx@inkvine.fluff.org
http://www.inkvine.fluff.org/~peter/
logic kicks ass:
(1) Horses have an even number of legs.
(2) They have two legs in back and fore legs in front.
(3) This makes a total of six legs, which certainly is an odd number of
legs for a horse.
(4) But the only number that is both odd and even is infinity.
(5) Therefore, horses must have an infinite number of legs.
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