[mythtv-users] Refresh line being seen

[Robert McNamara]

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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>

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