On Wed, 29 May 2002, leung wai wrote:
> 6. The reason I want to have Overlay enabled is that... it is too bloody
> slow to even watch a 320x240 mpeg since the video is not on Overlay! I can
> tell there is no overlay because of the colour (gamma doesn't apply to
> overlay). But even I have Option "Overlay", the KDE video players doesn't
> seem to pick it up. It is not like MS Windows where every video played would
> automatically put on overlay. What did I do wrong? Is there certain
> procedure I have to follow?
Option "Overlay" doesn't enable video overlays, it enables an 8bit
pseudocolor visual overlaid on the 24bit visuals.
You probably want the XVideo extension to enable video overlays.
If "xvinfo" doesn't say "no adaptors present" you have done this
correctly.
> 1. Is it possible have both Overlay and DRI enabled? I tried but it said no
> overlay screen found. However, it is okay if I don't load DRI module.
Last time I looked you couldn't have both overlay and DRI, but I'm
still running Linux 2.2, so I can't test recent DRI at the moment.
> 2. When I get Overlay enabled, it showed only 256 colours. Why? I have
> DefaultDepth 24 and DefaultFbBPP 32. If I don't enable Overlay it shows true
> colour.
This is becasue the 8bit visual is the default (use "X -cc 4" to change
this, if you still want Overlay).
> 3. How do I tell if X is running at 24bit or 32bit colour? (on G400 32bit is
> faster than 24bit, isn't it?)
In overlay mode you must have a 32bit framebuffer.
On my machine
grep "pixmap format" /var/log/XFree86.0.log
gives
(--) Depth 24 pixmap format is 32 bpp
which tells me I'm using a 32bit framebuffer.
> 4. What is this PseudoColor thing and how does it affect my Overlay?
It is the overlay visual
> 5. Is there a way to change colour depth on the fly? Like Ctrl-Alt-+ to
> change resolution. I have looked at the man pages but couldn't find a
> command for this purpose.
The RandR extension should allow this, but the matrox driver doesn't
have that extension. You may be able to use it with one of the kdrive
servers, but they don't accelerate the matrox cards.
--
Dr. Andrew C. Aitchison Computer Officer, DPMMS, Cambridge
[EMAIL PROTECTED] http://www.dpmms.cam.ac.uk/~werdna
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