[mythtv-users] vdpau worth it for hdtv?

Brad Templeton brad+myth at templetons.com
Mon Nov 16 01:47:44 UTC 2009

On Sat, Nov 14, 2009 at 04:57:49PM -0500, Pete Ratzlaff wrote:
> > On Fri, Nov 13, 2009 at 11:35:11AM -0800, Yeechang Lee wrote:
> > > Andre Newman <mythtv-list at dinkum.org.uk> says:
> > > > IMHO the ION is not doing VDPAU & MythTV any favours as it's not
> > > > powerful enough to make MythTV HDTV look as it should
> > > 
> > > I keep hearing that Advanced 2x (which the Ion isn't capable of
> > > handling) is better than Temporal 2x (which the Ion can handle, and
> > > which I use with my 8400GS), but yours is the strongest such statement
> > > so far!
> > 
> > I haven't found the difference to be as large as some people said.
> > The main benefit is the reduced CPU load.   Right now there are downsides
> > to VDPAU on an underpowered system -- the OSD will cause stutter in the
> > video if you use any of the advanced deinterlacers even on 480i, at
> > least as of 3 weeks ago.
> > 
> > It also is less tolerant of errors in your recording which is an issue
> > with stuff recorded off the air, and even some firewire recordings which
> > do drop packets from time to time.
> I'm running an IONITX-A combined front/backend, which I keep hearing is
> "underpowered" but I don't see any stutter with Temporal 2x
> deinterlacing of 1080i when the OSD is active. Granted, it took some
> tweaking to get things just right, but just about the only thing this
> setup isn't doing to my satisfaction is PiP.

I discovered the 8400gs was not able to do Temporal 2x on 1080i at all.
This is probably due to the PCI bus, rather than the chip which other
people report it able to do.   What I don't know is whether switching
to a 9400 or 9500 over PCI bus (it's an AGP computer) will change that.

I presume your ION at least has a fast bus to the video chip.

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