[mythtv-users] XvMC does not work on 720p!?

R. G. Newbury newbury at mandamus.org
Tue Jun 10 04:09:45 UTC 2008

Comments wrote:
> Hi, I recently tried both an nvidia GeForce FX 5700LE and a Geforce 6200 
> and have been pretty much unable to get XvMC working at all.
> I'm using OpenSuse 10.3 i586 with mythtv 0.21-9 from Packman and I'm 
> using the 173.14.05 NVidia drivers from NVidia's site (I have also tried 
> the 169 ones from the opensuse nvidia repository with the same results). 
>   I have a projector that supports native 720p and it displays perfectly 
> using the DVI out on either card.  However, I have not been able to get 
> XvMC working with either card except for once (and it hasn't worked since).
> The one time it did work, I was using the 5700LE and I had the output 
> (1024x768) going to an LCD panel using the VGA out.  It worked using 
> mplayer for a couple tries.  Then once I got it working, I thought it 
> was all good, switched back to the projector in 720p, and have not been 
> able to get it working again since.
> I have the following in the Device section of the xorg.conf:
>      Option         "NvAGP" "1"
>      Option         "UseEvents" "true"
>      Option         "XvmcUsesTextures" "false"
> and I have libXvMCNVIDIA_dynamic.so.1 in  /etc/X11/XvMCConfig
> So, I'm really stuck on this whole thing and don't know what to do. 
> Apparently, XvMC *can* work. I'm wondering if it will work with 720p 
> native or if I have to use a "standard" computer resolution and if 
> there's anything else I am missing to get this working.

The nvidia driver can do xvmc (if your driver works with your kernel and 
distro...that appears to be the black art!)

2 things:
a)	You need a section in xorg.conf:

  Section "Extensions"
       Option "Composite" "Disabled"

b)	You don't say, but are you using the same output to the projector? If 
so, are the resolutions the same? X may be mixed up when you change. If 
not, is that output enabled? If it is a 'TV-OUT' output, it may need to 
be specifically enabled. Check the Mythtv wiki xvmc page, and the NVidia 
Readme, which explains the switches.

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