Re: Quad video cards and VMR9
- From: "Martin Hinchy" <MartinHinchy@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 9 May 2005 15:33:01 -0700
"Iain" wrote:
> This is perhaps a little high, but around what I would expect.
>
> If you run just one graph, then what do you see as the performance hit? If
> processor is around 20% or higher then you can understand the results.
>
With just one graph running the CPU usage fluctuated anywhere from 35 - 55%
but seemed to average around 40%. I also ran the same file through Windows
Media Player 10 and it ran slightly better, averaging around 33%.
We're just doing proof of concept at the moment and the computer we're
testing on is a Dell Precision 360 with a 3.2 GHz processor and 1GB of RAM.
The video cards are nVidia Quadro FX 1000s. The final computers will likely
be industrial rack mount computers with newer video cards.
> If it is less than 20% then I would look to the bus speed to the display
> card. How many MB/sec will it support?
>
Windows Media Player reports that the WMV files that we are using for
testing have a bit rate of 9820 KBits/sec. In the final product we will have
some control over the bitrate.
> What is the hardware spec - bigger processor (or dual) faster FSB and
> memory speed and faster graphics bus speed will perform better. And what is
> the bit rate of the WMV file. It *may* be a decoder bottleneck rather than
> a memory transfer bottleneck - oh, you could also try reducing the frame
> rate. That will help everything!
>
> Finally, you may find the 'classic' renderer performs better. IIRC my
> results found that the classic renderer was more likely to connect with a
> YUV type which significantly reduces the bytes per frame. If you can force
> a YUV connection you wil see better performance.
>
> YOu might also wish to check for dropped frames - at 90% it is quite likely
> that the system is actually dropping frames to keep up.
>
>
Interestingly I've put some questions to nVidia regarding VMR9 and quad
video cards and their response is below:
"Video playback is only supported un VMR mode since video overlay spec is
not designed for multi-monitor use. Depending on what type of PC you will be
installing this in. If you will be building a new system, we suggest
purchasing a system with dual PCI Express 16x slots such as a system based on
our nForce4 SLI motherboards. These feature two PCI Express 16x slots to
support two PCI Express 16x graphics cards. As for the graphics cards that
would work best in this configuration, we recommend two Geforce 6600GT PCI
Express w/ Dual DVI (not all include dual DVI ports)."
.
- References:
- Quad video cards and VMR9
- From: Martin Hinchy
- Re: Quad video cards and VMR9
- From: Iain
- Quad video cards and VMR9
- Prev by Date: Stopping capture graphs - errors
- Next by Date: Re: Quad video cards and VMR9
- Previous by thread: Re: Quad video cards and VMR9
- Next by thread: Two monitors and VMR-7
- Index(es):
Relevant Pages
|
