[mythtv-users] Refresh line being seen

[Robert McNamara]

On Sat, Feb 14, 2009 at 6:57 PM, Paulin <paulin at spextreme.com> wrote:
> 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
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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
>>
>
> Thanks...Can you hint to me how to do that?
>
> steve
>
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>

Section "Extensions"
    Option         "Composite" "Disable"
EndSection


Note that lots of other stuff (Compiz, etc.) relies on Compositing
enabled, and that you may find that alt-tabbing out of myth (or having
another window pop up, like the screensaver) during VDPAU video
playback will render video playback black until you stop it.  In
short, it can be pretty and inconvenient, or function solid and
not-so-pretty.

Guess this is what they mean by "alpha features."

Robert