[mythtv-users] refresh rates and hd

[Steven Adeff]

> On 11/1/06, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
> > On 10/31/06, Michael Wisniewski <wiz561 at gmail.com> wrote:
> > > On 10/30/06, Steven Adeff < adeffs.mythtv at gmail.com> wrote:
> > > > On 10/26/06, Michael Wisniewski < wiz561 at gmail.com> wrote:
> > > > > Hi!
> > > > >
> > > > >     I'm probably going to be getting a GeForce 7300 card to be able
> to do
> > > > > hi-def.  I'm planning on using the component out jacks on the 'pod'
> that
> > > > > comes with the pny version of this card.  I have a Sony XBR 32" tube
> tv.
> > > > >
> > > > >     I was wondering/hoping somebody could recommend some settings
> for me.
> > > > > I've heard some horror stories about how tv's start smoking if you
> don't get
> > > > > the information correct, and I would hate for this to happen.  I
> found the
> > > > > following table....
> > > > >
> > > > >
> > >
> http://www.timefordvd.com/tutorial/DigitalTVTutorial.shtml#RefreshRate
> > > > >
> > > > >    That seems like it has all the numbers I need for the xconfig.
> Do
> > > these
> > > > > numbers look good?  Should I use something else?
> > > >
> > > >
> http://www.mythtv.org/wiki/index.php/Modeline_Database
> > > >
> > > > as well, you can also use any of the following which will tell the
> > > > nvidia driver to use the HDTV modes built in to the drivers,
> > > > "1920x1080_30"
> > > > "1920x1080_60"
> > > > "1280x720_60"
> > > > "720x480_60"
> > > Thank you for the response!
> > >
> > > I am having problems with getting my card working though.  Here's the
> > > details...
> > >
> > > I have a Sony 32XBR450 (1080i/480i/480p) input via component out from
> the
> > > dongle on the video card (Nvidia GeForce 7300 card).
> > >
> > > When I try to configure the xorg.conf file for "hd1080i" and startx,
> > > everything looks good.  But then, if I go into some of the myth menus
> (IE:
> > > setup menus/appearance), the horizontal lines flash and show up as
> double.
> > > Then if I exit, the box pops up with myth regenerating the views.  The
> > > vertical lines flicker extremely fast...kind of annoying.
> > >
> > > Anyways, I have a strange feeling that this might be related to the
> > > horizontal / vertical refresh rates, but not totally sure.  I currently
> > > don't have any of this set in my xorg file.  I thought I read somewhere
> that
> > > the latest nvidia driver (which is what I'm using from the nvidia web
> site)
> > > automatically sets the refresh rates.
> > >
> > > Well, if there's any ideas out there, please let me know!!!!
> >
> > thats more or less normal with 1080i output over component video for
> > computers. I was getting the same interlace flickering using component
> > to my 1080i tube HDTV as well. It has to do with the progressive to
> > interlace conversion. You may want to run your GUI at 720p and then
> > have Myth switch the video output to match the source material, which
> > is what I did with mine.
> >
> > also, everytime you go into the Appearances menu mythfrontend will
> > reload the video output stuff like you saw.
On 11/1/06, Michael Wisniewski <wiz561 at gmail.com> wrote:
> Ah, again, thank you very much for the response.
>
> Unfortunately, my TV doesn't support 720p.  Just 480i/p or 1080i.  :-(

it should accept the 720p signal though (it may convert it to
1080i...), which should fix the interlace flickering.

> Besides going cross-eyed, can there be any damage that is done to the set
> when it does this?  That is really my main worry because everything I read
> about video out, it says that you should use caution.  I smoked (literally)
> a monitor once and would hate to do it again with my TV.

as long as your HorizSync and VertRefresh values are set to what your
TV will accept then you shouldn't have a problem, any modelines that
are outside this range won't be used.

> I know this may be a little OT, but how do you know if you're going to ruin
> your tv/monitor?  Does the picture look funny?  I always read the warnings,
> but they don't say what to look for.

basically the signal gets accepted by the TV(which is a fault of the
tv's electronics) and it then try's to display the signal, which looks
all messy, the TV emits a high pitch noise, and usually it will cause
the circuitry to over heat and "smoke". Most modern TV's wont' accept
a signal outside their range, older TV's weren't smart enough to.


please bottom post and trim your emails, see the mailinglist etiquette
in my sig...
-- 
Steve
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