[mythtv] Quality of TV out and vga to tv converters?

[Chris Liscio]

Hi Rob,

Here is my settv script that I call just before starting up mythfrontend:

---
peanut:/home/mythtv# cat settv
#!/bin/sh

# Set the tv-out parameters.
sudo nvtv -t -S NTSC -r 640,480 -s Normal --set flicker:75 --set
sharpness:100 --set Brightness#:-20 --set Contrast#:-30 --set saturation#:30
--set chromabandwidth:100 --set lumabandwidth:100

# Set the v4l parameters
v4lctl color 75%

# Set the mixer to record the auxillary line
amixer set Aux mute record

# Turn off the annoying screen saver
xset -dpms s off
peanut:/home/mythtv#
---

The nvtv line does quite a bit to my display quality.  I like the flicker
filter to be lowered quite a bit more than what it is right now (usually 25
or 50%) because the "flicker" is unnoticeable with live tv (or any other
moving picture) but unbearable when using your desktop.  Because I do often
use the tv to hack around (the cvs version likes to go down a lot lately) I
have mine jacked up.

The v4lctl line is up to you to modify.  I no longer need it with CVS since
my picture quality settings have been applied, but it may buy you even more
customizability.

The amixer line does exactly what it needs to do so that I can ensure that
all is well with the Aux settings when I start mythtv.

Finally, xset prevents the screen from going purple or starting any
screensavers.

Hope this helps out,

Chris

> -----Original Message-----
> From: mythtv-dev-admin@snowman.net 
> [mailto:mythtv-dev-admin@snowman.net] On Behalf Of Rob Chambers
> Sent: Tuesday, December 17, 2002 11:52 PM
> To: mythtv-dev@snowman.net
> Subject: Re: [mythtv] Quality of TV out and vga to tv converters?
> 
> 
> I just switched from an ATI card using an external convertor 
> since the video out did not work to a geforce 2 with video 
> out. With very little tweaking this is a significant improvement.
> 
> Chris - would you be willing to send some of your settings to 
> use as a starting point in my own tweaking?
> 
> Thanks
> Rob
> ----- Original Message -----
> From: "Chris Liscio" <chris@supermegaultragroovy.com>
> To: <mythtv-dev@snowman.net>
> Sent: Tuesday, December 17, 2002 7:49 PM
> Subject: RE: [mythtv] Quality of TV out and vga to tv converters?
> 
> 
> > Have you tried nvtv yet?
> >
> > http://sourceforge.net/projects/nv-tv-out
> >
> > I am able to get some seriously fantastic results with some 
> patience 
> > and tweaking.
> >
> > Unfortunately, capturing a tv-out signal would be pretty 
> tough here, 
> > so I can't give a visual comparison.  You'll just have to take my 
> > word, I
> guess.
> >
> > Enjoy,
> > Chris
> >
> > > -----Original Message-----
> > > From: mythtv-dev-admin@snowman.net 
> > > [mailto:mythtv-dev-admin@snowman.net] On Behalf Of 
> Christopher Mind
> > > Sent: Tuesday, December 17, 2002 10:41 PM
> > > To: mythtv-dev@snowman.net
> > > Subject: [mythtv] Quality of TV out and vga to tv converters?
> > >
> > >
> > >
> > >
> > >
> > > I have an nvidia geforce 3 with s-video TV out and I have 
> to turn up 
> > > the contrast level on the TV to improve video quality.  This is
> > > in Windows and
> > > Linux.  Otherwise the colors would seem washed out or faded.
> > > Is this true
> > > for most S-video TV out cards ?  Is a VGA to tv converter (or
> > > whatever it is
> > > called) really so much better?  Can someone  post 
> comparative pics of
> > > S-video and vgatotv outputs?   Thanks
> > >
> > >
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