RE: CCTV camera on TV

["Paul Gale" <groups@xxxxxxxxxxxxxxxx>]

That's correct Gordon,

You may be able to get what you want though by disabling the overlay
surface and forcing the graphics card display drivers to render the video
surface in software. Matrox cards have this facility in the Powerdesk app
(use video overlay - disabled). I've used this to capture video windows
where they would normally be a black (or purple) screens.

There may be a slight degradation in performance and/or video window
quality by disabling the video overlay although I can't say as I notice it.

Other cards/drivers may or may not allow you to do the same.

Paul.

> -----Original Message-----
> From: Paul Gordon [mailto:paul@xxxxxxx]
> Sent: 31 December 2004 10:17
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] CCTV camera on TV
>
>
> I have seen something like this before, and IIRC it was something to
do
> with the "video overlay" mode... If I have understood the
concept of
> what was going on correctly, (and it's *extremely* likely that I
> haven't!), I think the problem was something along the lines of the PC
> graphics card is not responsible for rendering the video part of the
> display, but instead just leaves a blank "hole" in the
screen where
> another bit of hardware or software then "fills in" the gap
with the
> video...
>
> I saw this result in an annoying feature of my Matrox G400 dual-head
> graphics card that only (as I now know) supports video overlay on one
of
> the two displays. This meant that when I tried to play DVD's, media
> player would come up; I'd get the sound, but no video... It took me
ages
> to figure out what was going on, since I thought I had the wrong
codec's
> installed or something, and since the two displays were in different
> locations (and couldn't both be seen at once), it took me a while to
> realise that the video displayed OK on the other monitor.... swapped
the
> VGA plugs around, and viola, I had the DVD video on the display where
I
> wanted it...
>
> This sounds like it could be your problem, and since the graphics card
> isn't rendering the video part of the display, I guess there's no way
> you'll ever capture it by doing a screen grab, which I guess just
grabs
> the data stream from the graphics card...
>
> Sound plausible? - If not, I'm sure someone far more knowledgeable on
> this subject will be along shortly to correct me...
>
> Paul G.
>
>
>
> -----Original Message-----
> From: Stephen Jones [mailto:ukha@xxxxxxx]
> Sent: 30 December 2004 18:51
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] CCTV camera on TV
>
>
> Mark
>
> Recently I tried to modulate the "TV Out" of the graphics
cards but for
> some
> reason couldn't get the GV images to be displayed on the TV.
>
> I could get the PC video to be displayed on the TV but the GV images
> would
> not. IIRC everything was being displayed on the TV apart from the GV
> images.
> Even if I took a screenshot using "PrintScreen" and then
tried viewing
> the
> jpeg using an app like Paint it still wouldn't display the camera
image.
>
> Have anyone ever heard of that happening before? Maybe it was just
that
> particular video card.
>
> Steve
>
> -----Original Message-----
> From: Mark McCall [mailto:lists@xxxxxxx]
> Sent: 30 December 2004 17:56
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] CCTV camera on TV
>
> > like to be able to display the output on the TVs. To do this I
think I
> > need the Real Time Display card - correct?.
>
> I modulate mine round all the TVs in the house (without the relatime
> card) -
> look here...
> http://www.automatedhome.co.uk/contentid-7.html
>
> I just use the composite "TV Out" from my graphics card and
feed it into
> a
> modulator.  I think the difference the realtime card gives you is max
> framerate on each camera, rather than the restricted frame rate of
your
> card.
>
> > some way to chose which one or select which one I want to view??
>
> You can display multiple cams at once like this...
> http://www.biometria.com.pe/geovision19.jpg
> http://mipagina.cantv.net/redondo/gv_principal.jpg
> or you can have them on a timer showing in sequence etc.
>
> M.
>
>
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