[mythtv-users] video distortion

[Will Constable]

It might be the cabling-the TV off In a room downstairs and I ran cat-5 to
it, then put s-video and analog audio connectors onto the twisted pairs.
Its about 45 feet of cable, and I was afraid when I ran it that some
distortion would occur. but the fact that my laptop drives perfect video and
sound encouraged me.  I wonder if there is poor enough shielding near the
connecter itself where the twisted pairs had to be un-twisted that the vga
cable is polluting it.  I'll play around with all sorts of these things when
I get home-I really appreciate the input.  

 

-Will

 

  _____  

From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Brian Wood
Sent: Wednesday, June 07, 2006 11:10 AM
To: Discussion about mythtv
Subject: Re: [mythtv-users] video distortion

 

 

On Jun 7, 2006, at 9:00 AM, Will Constable wrote:





I'm running two different resolutions, spanning desktops on vga and s-video.
This could be the problem I suppose - would unplugging the vga monitor do
the trick or do I have to boot with the output disabled?

 

 

It's basically a try-and-see situation.

What you are seeing is the horizontal sync bar from your vga video floating
through your S-Video signal. It all makes sense once you mentioned that
you're using two monitors.

 

The cross-coupling can happen in different ways. One is simply magnetic
coupling between the two monitors, see what happens if you simply power down
the VGA monitor.

 

The only way to fix that type of problem is to move the monitors further
away from each other, or use some type of magnetic shielding such as
"mu-metal". Using better shielded monitor(s) would help as well.

 

You could also be getting cross-talk between the cables, using better
shielded cables might help this sort of problem.

 

The cross-talk could also be happening in the video card itself, but a newer
"better" card might or might not be better shielded.

 

Like I said, you will just have to experiment and see what helps.

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