On Sun, 16 Jan 2011 10:46:27 -0800
VDR User <user....@gmail.com> wrote:

> On Sun, Jan 16, 2011 at 10:22 AM, Tony Houghton <h...@realh.co.uk> wrote:
> >> Maybe a better idea is to not assume anything at all, but rather
> >> actually look up real life data or just buy one and see for yourself
> >> (as I did).  There's no reason to take guesses about any of this
> >> stuff, plenty of users have posts their results and specs at various
> >> forums.  A good place to start would be nvnews.net and read the thread
> >> "VDPAU testing tool".
> >
> > The results don't give the right information to determine how well a
> > card can handle 1080i.
> You apparently don't know the results come from analyzing actual
> playback of actual samples of actual content.  Yes, the data tells you
> exactly what kind of performance you can expect since it's generated
> from actual use cases.  Again, stop assuming everything and turning
> your nose up at first-hand experience.  I've ran those tests myself,
> obviously know what deinterlacers I'm using, and have watched plenty
> of content seeing the result with my own eyes from the hardware we're
> talking about.  Additionally I've done the same with various hardware
> configurations..  What you're telling people simply doesn't agree with
> reality.

I've attached the results of qvdpautest on my desktop PC. Some of the
examples appeared to have no more than 2 or 3 frames. Does the test
generate a 'realistic' stream using the same few source frames over and
over again? Even if it does, it seems a rather narrow sample.

The MIXER results show unrealistically high fps. Evidently the
deinterlacing is not being performed at the same time as decoding in
these tests. I suppose it's easy enough to caclulate the frame rate of
both operations combined for a worst case, but how do you know to what
extent they can be performed in parallel?

qvdpautest 0.5.1
AMD Athlon(tm) II X4 620 Processor
NVIDIA GPU GeForce 9800 GTX+ (G92) at PCI:1:0:0 (GPU-0)

VDPAU API version : 1
VDPAU implementation : NVIDIA VDPAU Driver Shared Library  260.19.21  Thu Nov  
4 21:46:12 PDT 2010


MPEG DECODING (1920x1080): 77 frames/s
MPEG DECODING (1280x720): 154 frames/s
H264 DECODING (1920x1080): 45 frames/s
H264 DECODING (1280x720): 99 frames/s
VC1 DECODING (1440x1080): 122 frames/s

MIXER WEAVE (1920x1080): 2785 frames/s
MIXER BOB (1920x1080): 4807 fields/s
MIXER TEMPORAL (1920x1080): 1235 fields/s
MIXER TEMPORAL + IVTC (1920x1080): 756 fields/s
MIXER TEMPORAL + SKIP_CHROMA (1920x1080): 1629 fields/s
MIXER TEMPORAL_SPATIAL (1920x1080): 485 fields/s
MIXER TEMPORAL_SPATIAL + IVTC (1920x1080): 387 fields/s
MIXER TEMPORAL_SPATIAL + SKIP_CHROMA (1920x1080): 538 fields/s
MIXER TEMPORAL_SPATIAL (720x576 video to 1920x1080 display): 1682 fields/s

MULTITHREADED MPEG DECODING (1920x1080): 75 frames/s
MULTITHREADED MIXER TEMPORAL (1920x1080): 1032 fields/s
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