[mythtv-users] Not your everyday newbie questions
phil.strong.sds at gmail.com
Wed Oct 12 02:31:33 UTC 2005
Can we please expand on this firewire use for a comcast box?
I was under the impression this was used as a comm channel for the mythbox
to send signals to change channels and such much like a similar usb
connection. Am I wrong?
On 10/11/05, Robert Denier <denier at umr.edu> wrote:
> On Tue, 2005-10-11 at 13:56 -0400, R. Stavros Bezas wrote:
> > Robert,
> > In regards to the "1:1 pixel mapping" idea you suggested: Do you have
> > any more information regarding this so I can look further into it, I
> > am curious to find out more about it.
> 1:1 mapping only applies to discrete devices like lcd's and dmd (digital
> micromirror device). Thanks to google I now know that is what DLP uses.
> (This is difference between a technical article read years ago and
> something useful.)
> At any rate those devices have some real physical resolution since there
> is a discrete number of elements. Perhaps it is 1920x1080. I don't
> know. What you want to do is set your graphics card to that physical
> resolution and use a dvi/hdmi cable to send it to your tv.
> Now the key to 1:1 pixel mapping is your sending digital data for say
> coordinate 100,500 over that dvi cable. That data should only be used
> to change the intensities associated with the 100,500th element. That
> is all there is to it. One would think it would be obvious and work
> everywhere there is a digital connection, but it doesn't.
> The vizio I have, for one, I couldn't get it to work with the hdmi
> connection, but apparently many tv's take that digital signal and
> rescale it and make it fit the available pixels, hence even if you input
> the exact size for your xorg.conf file, you get something that is
> slightly smeared on your screen.
> How do you determine if this is happening? Well create a png file that
> is composed of a black and white lines arranged vertically. Black lines
> for the even numbered lines, and white for the odd or visa versa. Show
> that on your tv and if it looks even and uniform then you have 1:1
> mapping, if not, then not.
> Again, if its mostly video your showing, I doubt you can really tell
> from a few feet away. You might tell with text, and well it will be
> obvious with that kind of prepared image. In general though a 1:1
> mapping should make things a little sharper than it otherwise be when
> sent from a computer.
> Note that you may not be able to manage your full resolution as a 1:1
> mapping. The panel I'm getting is 1366x768 and I've read reports that
> you can do 1360x768 and throwing away 6 lines.
> At any rate good luck..
> mythtv-users mailing list
> mythtv-users at mythtv.org
Synergetic Data Systems
(w) 240 793 6565
pstrong at synergetic.us
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the mythtv-users