[mythtv-users] Fuzz in my video output

[mooshie]

On Mon, 2006-06-19 at 21:24 -0600, Brian Wood wrote:
> On Jun 19, 2006, at 4:18 PM, Daniel Kristjansson wrote:
> 
> > On Mon, 2006-06-19 at 16:02 -0600, Brian Wood wrote:
> >>>> It's probably being transmitted intentionally, it is data, in the
> >>>> digital equivalent of the vertical blanking interval.
> >>>> Usually most TVs overscan just a bit to prevent this showing up in
> >>>> the picture.
> >>> I'm viewing this on my monitor (Dell 24 inch 2405FPW LCD).. have
> >>> you heard of it happening on monitors as well?
> >> Especially on monitors, because they normally do not overscan at all.
> >> I think Myth has some overscan settings in it, I'm not by my machine
> >> at the moment and so can't check.
> >> But I want to be sure this is what the problem is, I've never watched
> >> QAM channels enough to notice if there is usually a bunch of data at
> >> the top.
> >> Can anybody else confirm this ? The description certainly sounds like
> >> what data would look like in that position.
> >
> > I can confirm this is VBI data. This happens when the broadcaster or
> > cable operator captures the entire frame of a NTSC stream. If you use
> > either of the computer inputs on the monitor it won't do any overscan
> > so you will see this data. MythTV can scale the video up a bit to hide
> > this data. This one of the playback options and is called "overscan"
> > in 0.19 and 0.19-fixes.
> 
> 
> Thanks, I just wanted to confirm that, because I went and checked a  
> recording I'd made of a couple of QAM channels and I saw only about 1  
> or 2 lines of what looked like data, not "half an inch".

Actually now that I look at the noise more closely, it really is only a
couple lines (I wrote the email at work when I wasn't looking at my
screen). Have you found any way to get rid of it?