[mythtv-users] Inexpensive, preassembled, VDPAU-friendly frontends

Gordon McCrae gordon.mccrae at googlemail.com
Mon Dec 1 18:36:35 UTC 2008

Nick Rout wrote:
> On Tue, Dec 2, 2008 at 4:30 AM, Scott D. Davilla <davilla at 4pi.com> wrote:
>>> I'd love to see some testing with PCI boards.  I had a system with a
>>> couple of PCI boards (nVidia Quadro NVS55); the most I could get was
>>> 1280x1024 before losing acceleration - or at least before the framerate
>>> got really, really bad.  Since the performance would fall off a cliff
>>> very suddently, I suspect it was due to PCI bandwidth limitations. The
>>> system would do HD source but I'd have to show it at a reduced resolution.
>> PCI bandwidth does not come into play with VDPAU, the h.264 bitstream
>> is being moved over PCI, not the decoded video content. The GPU
>> handles the video decode.
>> Works like a champ using an atom 330 and PCI 8400 nvidia card.
> decoding what source material?
You also might want to check the specifications for your specific card.
I know I've tables showing support for XVMC only up to certain
resolutions (1024x1024 on my chipset). Above that, it just stops working
and X crashes. So your issue might be similar (although not XVMC) and
simply be that your card can only support 1280x1024, and after that the
driver or card starts to drop back.


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