[mythtv-users] Toggling compositing

Chris gcsa60 at gmail.com
Mon Mar 25 15:22:15 UTC 2013 

On 13-03-24 07:58 PM, Igor Cicimov wrote:
>
>
> On 25/03/2013 8:19 AM, "Chris" <gcsa60 at gmail.com 
> <mailto:gcsa60 at gmail.com>> wrote:
> >
> > On 13-03-24 01:40 PM, Igor Cicimov wrote:
> >>
> >>
> >> On 25/03/2013 7:02 AM, "Chris" <gcsa60 at gmail.com 
> <mailto:gcsa60 at gmail.com>> wrote:
> >> >
> >> > On 13-03-24 12:07 PM, HP-mini wrote:
> >> >>
> >> >> On Sun, 2013-03-24 at 11:00 -0700, Chris wrote:
> >> >>>
> >> >>> Hello Everyone,
> >> >>>
> >> >>> I have very naive newby question.
> >> >>>
> >> >>> When I setup my MythTV frontend I was having some trouble with 
> tearing.
> >> >>> I originally had the video playback profile set at Normal and I 
> read
> >> >>> somewhere that what I really wanted was VDPAU so I started messing
> >> >>> around with the settings but couldn't get it to work at first. 
> (For the
> >> >>> record the GPU is GeForce 8200/integrated/SSE2 and the CPU is AMD
> >> >>> Athlon(tm) Dual Core Processor 4850e × 2). The MythTV Official 
> Wiki had
> >> >>> a few suggestions one being to place the following in my 
> /etc/X11/xorg.conf:
> >> >>>
> >> >>>    Section "Extensions"
> >> >>>         Option "Composite" "Disable"
> >> >>>     EndSection
> >> >>>
> >> >>> I think this was already in my xorg.conf because it's there now 
> and I
> >> >>> don't remember putting it in (but that's another story).
> >> >>>
> >> >>> The problem is, I have recently downloaded the Netflix app onto my
> >> >>> computer and it wants compositing enabled.  So I looked for 
> solutions
> >> >>> and I found that I have a package on my computer called
> >> >>> plasma-widget-toggle-compositing which looks like it might do the
> >> >>> trick.  My question is:
> >> >>>
> >> >>> If I enable this widget is it going to screw-up Mythtv somehow 
> (Synaptic
> >> >>> Package Manager suggests it is linked to file associated with 
> Mythtv)?
> >> >>>
> >> >>> My guess is no; but, I have had so much trouble getting this 
> thing to
> >> >>> work and wasted so much time fixing mistakes that I really want 
> to avoid
> >> >>> them.
> >> >>>
> >> >>> Other possibly relevant information is that I'm using Mythtv 
> 0.26 run on
> >> >>> Ubuntu 12.04.
> >> >>>
> >> >>> Thank you once again for your help and guidance.
> >> >>> Chris
> >> >>>
> >> >> Lots of people have problems with tearing so I don't think the 
> solutions
> >> >> are so obvious..
> >> >> I assume you are using unity desktop (compiz plugin).
> >> >> I have never had to disable composite (disables effects 
> managers) on old
> >> >> lucid gnome 2 or 12.04 with unity/fallback/consort/kde/etc..
> >> >>
> >> >> To get the best performance (mythtv & vdpau) you need vdapau to use
> >> >> video overlay (guarantees no tearing) & that requires
> >> >> composite/re-direction to be blocked.
> >> >> You can use "ccsm" to tweak a couple of compiz/unity settings:
> >> >> - enable un-redirect full screen
> >> >> - enable legacy full screen support
> >> >> Be very cautious with this tweak tool, unity seems not completely
> >> >> compatible with compiz setting tool.
> >> >> Of course this only works with mythtv in full screen mode.
> >> >>
> >> >> Another possible problem is the incorrect refresh rate reported by
> >> >> nVidia driver (when using twinview metamodes).
> >> >> If using twinview you may need to manually set the composite refresh
> >> >> rate (no auto detect).
> >> >> AFAIK Later nVidia drivers have solved the incorrect refresh 
> reporting.
> >> >>
> >> >> I don't know about the plasma-widget-toggle...
> >> >>
> >> >> Brett
> >> >>
> >> >> _______________________________________________
> >> >> mythtv-users mailing list
> >> >> mythtv-users at mythtv.org <mailto:mythtv-users at mythtv.org>
> >> >> http://www.mythtv.org/mailman/listinfo/mythtv-users
> >> >
> >> > Thanks Brett,
> >> >
> >> > When I first read your e-mail I thought you had misunderstood the 
> issue but on reading it again I get the impression that your telling 
> me that I can take take the "Option "Composite" "Disable"" command out 
> of my /etc/x11/Xorg.conf.   Is that correct?
> >> >
> >> > If you are suggesting I take it out, do I just change it to the 
> below or just delete all three lines from the file?
> >> >
> >> >    Section "Extensions"
> >> >         Option "Composite" "Enable"
> >> >     EndSection
> >> >
> >> > Currently I have Mythtv running under VDPAU slim (still stutters 
> horribly under VDPAU normal or high quality) and I am very happy with 
> the picture quality .  I was trying everything under the Myth Official 
> Wiki but the last thing I did was add the line below to my 
> /etc/X11/Xorg.conf  and it seemed to do the trick.
> >> >
> >> >    Option         "TripleBuffer" "True"
> >> >
> >> > I actually considered taking the Composite Disable command out of 
> my Xorg.conf file but because I didn't remember adding it in the first 
> place (and I might have because I have been tweaking like a madman 
> since boxing day (the day I entered the world of linux and mythtv)), I 
> was worried that it was necessary for the operating system (of course 
> I don't really understand what compositing is).
> >> >
> >> > Thanks again
> >> > Chris
> >> >
> >> There is a setting, tick box, somewhere in the frontend to separate 
> mythtv screen from the desktop. Do you have it ticked?
> >>
> >>
> >>
> >> _______________________________________________
> >> mythtv-users mailing list
> >> mythtv-users at mythtv.org <mailto:mythtv-users at mythtv.org>
> >> http://www.mythtv.org/mailman/listinfo/mythtv-users
> >
> > Do you mean under Setup>Appearance>Video Mode Settings> Separate 
> Video Modes for GUI and TV Playback?
> >
> > If so the answer is I don't have that checked because it creates 
> terrible overscan or underscan which persists even when I shutdown  
> Mythtv Frontend. I have to reboot to make it right again.
> >
> > Two observations of probable significance.
> > 1) I removed the composite disable line from my Xorg.conf, rebooted 
> and now VDPAU Slim does not work (stutters).
> > 2) I checked the Separate Video Modes for GUI and TV Playback box 
> (still compositing enabled)  and VDPAU Slim still doesn't work. Have 
> to reboot now because of overscan.
> >
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org <mailto:mythtv-users at mythtv.org>
> > http://www.mythtv.org/mailman/listinfo/mythtv-users
> >
> You need to fix the overscan inside nvidia control panel.
>

Overscan has already been taken care of in the Xorg.conf file with the 
following addition to the script.

Option      "metamodes" "DFP-0: 1280x720 { ViewPortIn=1280x720, 
ViewPortOut=1216x686+35+15 }"

For some reason Mythtv overrides and resets to whatever parameters you 
enter into Myth. These persist even after you shut down Myth.

I tried checking the 'Separate Video Modes for GUI and TV Playback" (as 
I think you were suggesting) and it did nothing to mitigate the issues I 
was having with VDPAU.  Disabling compositing is the only thing I've 
found that allows me to get VDPAU to work on my system.

It would appear that nobody here knows the answer to my original 
question about plasma-widget-toggle-compositing. I guess I'll just have 
to install it and see what happens.

Cheers
Chris


>
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