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

Nate Crosno ncrosno at ipass.com
Thu Jan 4 15:53:52 UTC 2007

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
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.


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


     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

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

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


Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mythtv.org/pipermail/mythtv-users/attachments/20070104/fb65aa9e/attachment.htm 

More information about the mythtv-users mailing list