[mythtv-users] XVMC Support for Intel 810

[Jeff Clemens]

It does appear that the ATRPMS myth package has XvMC support (per a posting
on the ATRPMS list that I found.  In any case, it doesn't seem to work with
the Intel 810 as far as I can tell.  I just need a little acceleration, as
most of the time, playback works perfectly, it's only after I've hit rewind
or fast forward that the video starts to lag... It never catches back up,
unless I slow playback down to 50% speed for 30 seconds... I can then switch
it back to 100% (or faster) and have it run perfectly indefinitely (unless I
rewind or fast forward again).  So just a little bit of acceleration would
have things working perfectly.

I'm considering turning off the onboard vga and picking up an nVidia card
unless I can get acceleration working on the 810.  It would be nice to not
have to use my one remaining PCI slot for vga, but if it works, that could
be the solution.


On 12/5/05, Todd Ignasiak <ignasiak at gmail.com> wrote:
>
> If I remember correctly,   the Intel 810/815 chips don't support the full
> MPEG2 acceleration capabilities.
>
> XvMC supports offload of MPEG2 Motion Compensation (which is the "MC" in
> XvMC) and iDCT (inverse Discrete Cosine Transform).   iDCT is the more CPU
> intensive component of the two.   But, I think the i810 only offloads the
> MC.   So, you probably won't get much boost out of XvMC on that platform.
>
> A Google search turn up this page, which talks about the capapilities of
> various cards with DxVA, the Windows equivalent to XvMC:
> http://www.elecard.com/technology/dxva.shtml    (Note that it doesn't
> include the newer NVidia GeForce 4MX or GeForce FX cards, which support full
> iDCT offload in Linux.)
>
>
>  On 12/4/05, Jeff Clemens <teedub303 at gmail.com> wrote:
>
> >  So from what i've read, XVMC was originally developed for the Intel 810
> > chipset, but I can't seem to find any information on how to get it working
> > with anything but nVidia video cards.
> >
> > I'm running FC4 on a fairly underpowered (700Mhz) box.  I actually have
> > 2 of the same boxes, but one uses a PVR350 and therefore uses the
> > accelerated output, but my other box uses VGA for display, and I get really
> > choppy video without XVMC.  If I enable XVMC in the setup screen, I get
> > "Can't initialize Video" messages when trying to playback a recording.
> >
> > Any tips/tricks that anyone on here knows about?
> >
> > Thanks,
> >
> > Jeff
> >
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