[mythtv-users] Intel and XvMC

Edward Hughes IV echughesiv at gmail.com
Thu Jan 17 17:49:26 UTC 2008

I just received a reply from the lead developer of the XvMC branch on the
Xorg list.  He said:

"915/945 are both supported in current xvmc branch. They have similar
MC feature, and 945's VLD feature is not supported now."

So, I think that this confirms that while most Intel hardware supports MC,
the driver doesn't, yet.

> I don't know *anything* about this stuff, but have been trying to
> understand it some over the last couple of days. All I do know is
> that my HD recordings (from DVB-T cards in Australia) seem to consume
> quite a lot of CPU when played back (almost 90% of one core). This is
> a Pentium D 3.0GHz machine with onboard Intel graphics. I assumed
> that XvMC isn't working for my card since so much CPU is being used.
> I am using the standard Intel driver that comes with Ubuntu Fiesty.
> This is my xorg.conf for the adaptor.
> Section "Device"
> Identifier "Intel Corporation 82865G Integrated Graphics Controller"
 > Driver "intel"
> BusID "PCI:0:2:0"
 > Option "UseFBDev" "true"
> EndSection

You could try adding the line:

     Option     "XvMCSurfaces" "7"

to your device section to see if XvMC is supported for your chipset.  I
doubt it is, as the man page still states that it only works for the i810
and i815 chipsets.  By checking your Xorg log, you'll be able to see.  You
can run:

     cat /var/log/Xorg.0.log | grep XvMC

It will either return a statement that it was enabled, or that the
"XvMCSurfaces" option is not used, which means that the driver doesn't
support your chipset.  For more information on the driver, check the manpage

     man intel

Anyway, it sounds like if we are just patient, accelerated video decoding
for Intel adapters is on the way!

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