[mythtv-users] Toggling compositing

[Chris]

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
>
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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


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