[mythtv-users] Refresh line being seen

[Paulin]

On Sat, Feb 14, 2009 at 9:54 PM, Robert McNamara
<robert.mcnamara at gmail.com>wrote:

> On Sat, Feb 14, 2009 at 6:50 PM, Paulin <paulin at spextreme.com> wrote:
> > On Sat, Feb 14, 2009 at 9:32 PM, Brian Wood <beww at beww.org> wrote:
> >>
> >> On Saturday 14 February 2009 19:25:57 David Brodbeck wrote:
> >> > Paulin wrote:
> >> > > Another question based on this information.  Is this line problem in
> >> > > the
> >> > > recording or in the playback.  If I pause the picture when it
> happens,
> >> > > the line goes away and shows up as soon as playing.  So that leads
> me
> >> > > to
> >> > > think playback
> >> > >
> >> > > Also I've noticed that it seems to happen when the picture is very
> >> > > busy
> >> > > (fringe cop lights flashing on the background with a few actors in
> the
> >> > > foreground).  With this does it still seem like a grounding issue.
> >> >
> >> > If it doesn't show up in still images, it's not a ground loop.  A
> ground
> >> > loop between the computer and the display would show up all the time,
> >> > even in menus.
> >>
> >> Right.
> >>
> >> And it would not freeze if you freeze video. If it seems locked to the
> >> video
> >> rate somehow it's definitely not a ground loop.
> >>
> >> Actually, if the hum bar were recorded, it would freeze, but that's not
> >> the
> >> type of problem he seems to have. This happens with a ground
> differential
> >> between the computer and the cable system, if you are using an internal
> >> card
> >> fed by RF to record, and could also be called a "ground loop".
> >>
> >> With a ground problem between the computer and the monitor the bar(s)
> will
> >> move as long as the monitor's vertical rate stays the same, no matter
> what
> >> the displayed video is doing.
> >
> > And I believe on some of my lower analog channels I have the grounding
> issue
> > (Ch 3, 6).  Those make the entire picture flicker with bars and are
> present
> > when paused.  However that isn't the issue I'm worried about as it is
> only
> > on the analog.  The other issue is on all things being played back.
> >
> > So I'm guessing its deinterlace or VDPAU playback related.
> >
> > steve
> >
> > _______________________________________________
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> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> >
>
> You are seeing lack of vsync.  VDPAU has no vsync when the composite
> extension is enabled.  You need to disable composite in your
> xorg.conf.
>
> Robert
>
>
Thanks...Can you hint to me how to do that?

steve
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