[mythtv-users] XvMC on NVidia with Myth .20 (Anyone getting good HD off a P4 3.2G or less without XVMC?)

Ali Asad Lotia ali.asad.lotia at gmail.com
Thu Jan 4 16:08:14 UTC 2007

I'm running on a p4 3.2 Ghz machine which is running Gentoo Linux and
I've installed Myth using the ebuilds. My machine specs are:

p4 3.2Ghz with hyperthreading enabled
Gigabyte P945 based motherboard
4 x SATA 300 HD.
Gigabyte GeForce 6600 PCI Express VGA
1 x PCHDTV 3000 PCI HD tuner card
1 x PVR-500 PCI SD tuner card

I have no problem playing back HD without XvMC enabled and this is a
combined frontend backend machine. I am currently not displaying at HD
resolutions since I don't (yet) have and HD display, but the machine
is decoding an HD stream.

Hope this helps.


On 1/4/07, Nate Crosno <ncrosno at ipass.com> wrote:
> I'm having the same issue -- xine works great with xvmc, but Myth does not.
> I've tried everything I can think of.  This is my last big hurdle.  It
> stinks that Myth is so finicky with xvmc while xine seems to work easily for
> most people.  I'm very interested to hear if you have any luck.
> On a slightly different topic, is anyone getting good quality HD playback
> *without* XVMC on a P4 3.2 Ghz or less?  If so, do you have HT enabled or
> disabled? (I've tried both). I thought this should have worked. I think my
> limiting factor is the PCI video card, but that's all my MB has.  I think
> the on-board video is AGP, but it's only VGA and I need DVI.  If I cannot
> get XVMC to work in Myth and others report that this processor is capable of
> HD, my other option is  a new MB and AGP video card and re-use the rest of
> my hardware. A quick search on newegg shows I can do that for about $90.
> Thanks,
> Nate
>  ________________________________
>  From: mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Billy Macdonald
> Sent: Wednesday, January 03, 2007 11:31 PM
> To: mythtv-users at mythtv.org
> Subject: [mythtv-users] XvMC on NVidia with Myth .20
> Hello,
>      For Christmas I bought myself my first HD tuner.  It's a USB tuner
> Hauppauge HVR 950.  I built a separate backend and have successfully
> configured it and have made a few test OTA recordings.
>      My frontend is a P4 1.6Ghz machine, so I definitely need XvMC for any
> hope.  I have the binary NVidia drivers, version 9631 installed and am
> currently running at a 1280x720 resolution.  I've had no luck trying to get
> XvMC to work in Myth.  I'm thinking next of trying the SVN versions,
> although I really don't want to mess with my backends.  Will I cause
> problems running the current SVN on the frontend but .20 stock on the
> backends?
>    I just noticed the release-20-fixes in SVN.  I think I'll give that a
> shot.
> As to what I've tried so far:
> XvMC works in Xine.  If I do an strace of Xine, I see it load the libXvMCW
> wrapper, read the /etc/X11/XvMCConfig file, and then load the
> libXvMCNVIDIA_dyanmic.so.1 file.  In Xine I can play my new HD recordings
> without studder or any other problems, both 1080i or 720p.  So I'm fairly
> confident that the NVidia stuff is setup right.
> ./configure --enable-xvmc
> Set the options to Standard XvMC, tried with various and no deinterlacing
> options.
> strace shows mythfrontend loading the XvMCW wrapper, but never even attempts
> to read the XvMCConfig file or load the Nvidia library.  The OSD display is
> gray so it's using some sort of XvMC, just not NVidia's I don't think.
> ./configure --enable-xvmc --disable-xvmcw
> It shows that it's linking to XvMCNVIDIA in the make output, but when all is
> said and done, ldd of mythfrontend does not show it linked to the library.
> strace fails to show any attempts to load the XvMCNVIDIA library.
> A bunch of other stuff has been tried too, but I had to stop messing around
> as my wife wanted to actually use the Myth box :)  But I was having fun
> tinkering.
>   I've tried various changes in nvidia-settings and xorg.conf, but since
> myth isn't even trying to use the driver, I don't think anything else really
> matters.
> And thanks for everything to all of you who do so much.  We love the MythTV.
> Billy
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