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View Full Version : What Does Overlay Mode Do?


Vamp
07-11-2004, 08:47 PM
On my TV Tuner (Which I run my my Dreamcast through and use to capture footage from my Camcorder) there is an option called Overlay Mode... What does this do?
peat moss
07-11-2004, 09:56 PM
What you hav'nt tryed it ? :lol: I would think its to do with full screen mode if you have the card and drivers that support it. Try it, and come back and post. :)


Edit: Its for watching tv on your monitor . Hence the full screen mode .
Vamp
07-11-2004, 10:38 PM
Huh?

How can Overlay mode be used for watching TV? All it seems to do is saturate the image more.
peat moss
07-11-2004, 10:46 PM
Not a lot of info. Sorry.
http://www.google.com/search?hl=en&lr=&ie=...rd+&btnG=Search (http://www.google.com/search?hl=en&lr=&ie=UTF-8&q=++++++How+to+use+Overlay+Mode+tv+card+&btnG=Search)
Vamp
07-12-2004, 12:02 AM
None of those links help <_<
tesco
07-12-2004, 12:04 AM
This is software related...i think. :unsure:
SingaBoiy
07-12-2004, 04:05 AM
Check your manufacturer or your manul for info.
Vamp
07-12-2004, 11:36 AM
Done it, just says, to increase performance disable overlaymode.
Snee
07-12-2004, 01:03 PM
Video overlay


One screen running on top of another.

So if it&#39;s settings for your tv, disable video overlay.
In addition video adapters can be digital whereas regular monitors are often analog, making it have to filter more of the signal when displaying two stacked screens or something.

If it screws up the picture, you ought to turn it on again.

Sometimes, when the picture is bad, on certain adapters it doesn&#39;t matter whether you shut it off, or turn it on, just altering it can improve your picture quality if it suddenly goes bad.
Vamp
07-12-2004, 02:17 PM
But what does running two images on each other achieve?
Snee
07-12-2004, 02:21 PM
Originally posted by Vamp@12 July 2004 - 15:25
But what does running two images on each other achieve?
One guess is that it&#39;s like this:

When you have several windows open on your desktop the information for each still goes out to the monitor or somesuch, only you can only see the topmost one, &#39;cos that information is noted as visible or such. Possibly this makes for smoother transits or something since it&#39;s already loaded in you ram or so.

Whereas when turning it off, the only info that goes out is the visible one.
lynx
07-12-2004, 06:26 PM
Overlay mode: The graphics card sets aside an offscreen buffer in its own memory, the image source card (tv card) transfers the picture in there by doing PCI bus master cycles. The graphics card scales, sizes and gamma corrects that, and fits it into the main picture.Source (http://www.stud.fernuni-hagen.de/q3998142/ubb/Forum4/HTML/000813.html)

In other words it gives the graphics card the opportunity to modify the image according to your preferences, rather than simply take the image as presented. But obviously this takes processing time so you may not get the full frame rate.
Snee
07-12-2004, 07:57 PM
Originally posted by lynx@12 July 2004 - 19:34

Overlay mode: The graphics card sets aside an offscreen buffer in its own memory, the image source card (tv card) transfers the picture in there by doing PCI bus master cycles. The graphics card scales, sizes and gamma corrects that, and fits it into the main picture.Source (http://www.stud.fernuni-hagen.de/q3998142/ubb/Forum4/HTML/000813.html)

In other words it gives the graphics card the opportunity to modify the image according to your preferences, rather than simply take the image as presented. But obviously this takes processing time so you may not get the full frame rate.
yep by buffering the information, saving all the screen info or something.

Keeping everything available so it can be manipulated on the fly.

Not just the visible, or so I understood it.