[AG-TECH] Quad Capture card performance
Osland, CD (Chris)
C.D.Osland at rl.ac.uk
Mon Apr 25 09:51:22 CDT 2005
No - it provides you with 4 video streams into your AG software.
Just as 4 separate Hauppage cards would.
Cheers
Chris
____________________________________________________________________
Chris Osland Office tel: +44 (0) 1235 446565
Digital Media and Access Grid Medialab tel: +44 (0) 1235 446459
BIT Department Access Grid room tel: +44 (0) 1235 445666
e-mail: C.D.Osland at rl.ac.uk Fax: +44 (0) 1235 445597
CCLRC Rutherford Appleton Laboratory (Bldg. R18)
Chilton, DIDCOT, Oxon OX11 0QX, UK
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> -----Original Message-----
> From: Natalia Costas Lago [mailto:natalia at cesga.es]
> Sent: 25 April 2005 15:50
> To: Osland, CD (Chris)
> Subject: Re: [AG-TECH] Quad Capture card performance
>
>
>
> So... the 4 inputs... is just like a multiplexer?
>
> ----- Original Message -----
> From: "Osland, CD (Chris)" <C.D.Osland at rl.ac.uk>
> To: "Natalia Costas Lago" <natalia at cesga.es>
> Sent: Monday, April 25, 2005 4:44 PM
> Subject: RE: [AG-TECH] Quad Capture card performance
>
>
> The most obvious is that the Winnov card handles 4 inputs to
> the Hauppage's one! So 4 inputs take one PCI slot with a Winnov
> and 4 PCI slots with Haauppages.
>
> Cheers
>
> Chris
>
> ____________________________________________________________________
> Chris Osland
> Office tel: +44
> (0) 1235 446565
> Digital Media and Access Grid
> Medialab tel: +44 (0)
> 1235 446459
> BIT Department Access
> Grid room tel: +44
> (0) 1235 445666
> e-mail: C.D.Osland at rl.ac.uk
> Fax: +44
> (0) 1235 445597
> CCLRC Rutherford Appleton Laboratory (Bldg. R18)
> Chilton, DIDCOT, Oxon OX11 0QX, UK
> [The contents of this email are confidential and are for the
> use of the
> intended recipient only.
> If you are not the intended recipient do not take any action
> on it or show
> it to anyone else,
> but return this email to the sender and delete your copy of it.]
>
>
>
>
>
> > -----Original Message-----
> > From: owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov]On
> > Behalf Of Natalia Costas Lago
> > Sent: 25 April 2005 15:37
> > To: ag-tech
> > Subject: Re: [AG-TECH] Quad Capture card performance
> >
> >
> >
> > Hi everybody,
> >
> > Does anyone the advantages of the Spectra8/Winnov Videum 4400
> > over the
> > Hauppauge Impact VCB?
> >
> > The hauppauge card is almost 5 times cheaper than the others.
> > Maybe there is
> > something am I missing?
> >
> > Thanks in advance for ur help.
> >
> > Kind regards,
> > Natalia.
> >
> > ----- Original Message -----
> > From: "Natalia Costas Lago" <natalia at cesga.es>
> > To: "Derek Piper" <dcpiper at indiana.edu>
> > Cc: "ag-tech" <ag-tech at mcs.anl.gov>
> > Sent: Monday, April 25, 2005 4:05 PM
> > Subject: Re: [AG-TECH] Quad Capture card performance
> >
> >
> > >
> > > Thanx a lot Derek!!
> > >
> > > That was enlightening!!
> > >
> > > ----- Original Message -----
> > > From: "Derek Piper" <dcpiper at indiana.edu>
> > > To: "John Hodrien" <johnh at comp.leeds.ac.uk>
> > > Cc: "ag-tech" <ag-tech at mcs.anl.gov>; "Natalia Costas Lago"
> > > <natalia at cesga.es>
> > > Sent: Monday, April 25, 2005 3:29 PM
> > > Subject: Re: [AG-TECH] Quad Capture card performance
> > >
> > >
> > >>
> > >> Of course if the system you're installing on only supports
> > 32-bit x 33Mhz
> > >> slots (as many do) then you're not going to get a lot of benefit.
> > >> Natalia, what are the hardware specs on the capture
> machine you're
> > >> upgrading or rebuilding?
> > >> It's important to note too that however many PCI *slots*
> > you have, you
> > >> (normally) only have one PCI *bus*. And the TOTAL
> > bandwidth of that bus
> > >> is 32bit x 33Mhz = 132MBytes/sec. So however the cards are
> > arranged
> > >> (singly or quad) you're going to run into that same
> > bandwidth limitation.
> > >> Of course the quad capture card might be slightly more
> > efficient due to
> > >> it being the only card on the bus and thus eliminating bus
> > contention
> > >> between the capture cards.
> > >> To reiterate the math here?
> > >>
> > >> 33000000 x 32 = 1056000000 bits/sec PCI max
> > >>
> > >> = 132000000 bytes/sec PCI max
> > >>
> > >> 1 frame (24 bit color) = (768 x 576 x 24 / 8 ) = 1327104 bytes
> > >>
> > >> 25 fps = 33177600 bytes/sec
> > >>
> > >> x 2 captures = 66355200 bytes/sec
> > >>
> > >> x 3 captures = 99532800 bytes/sec
> > >>
> > >> x 4 captures = 132710400 bytes/sec
> > >>
> > >> Derek
> > >>
> > >> John Hodrien wrote:
> > >>> On Mon, 25 Apr 2005, Natalia Costas Lago wrote:
> > >>>
> > >>>>
> > >>>> We are about to purchase a Spectra8 capture card or
> > Winnov Videum 4400.
> > >>>> It's
> > >>>> a very good point not to have to use 4 PCI buses, that's
> > what I like
> > >>>> most of
> > >>>> both cards, however I am concerned to performance
> > issues, I mean, a PCI
> > >>>> bus
> > >>>> allows 132 Mbps more or less, and the Spectra8 delivers
> > 4 videostreams
> > >>>> at
> > >>>> 30fps 768x576 (it can be less, that's the worst case)
> > (similar values
> > >>>> for
> > >>>> the Videum 4400 card). So, it seems to me that the PCI
> > bus cannot
> > >>>> transmit
> > >>>> so much information, that means, does it drop frames?
> > Maybe I cant get
> > >>>> the
> > >>>> highest resolution at 30fps (25fps for the Winnov card)?.
> > >>>
> > >>>
> > >>> It won't be 30fps at 768x576 will it? That's PAL
> > resolution at NTSC
> > >>> frame
> > >>> rates. If you drop that to 25fps, the back of my
> > envelope looks like
> > >>> you'd
> > >>> indeed be rather close to 32 bit PCI limits. The 4400
> > supports 64bit
> > >>> PCI,
> > >>> thus solving that problem.
> > >>>
> > >>> jh
> > >>>
> > >>
> > >> --
> > >> Derek Piper - dcpiper at indiana.edu - (812) 856 0111
> > >> IRI 323, School of Informatics
> > >> Indiana University, Bloomington, Indiana
> > >>
> > >
> > >
> >
> >
>
>
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