[AG-TECH] more on multi-input capture.

Derek Piper dcpiper at indiana.edu
Wed Jul 13 09:46:40 CDT 2005

	To clarify this, you can still use all four inputs for an AG session - 
you just need to have 4 instances of VIC


Thomas D. Uram wrote:
> There is a vfw/wdm mapper, but it can only map a single wdm device to vfw, so vic only has
> access to one of the four.
> On 07/13/05 08:20, Derek Piper wrote:
>>    I believe there is a 'wrapper' in 2000/XP for WDM drivers to the VfW
>>interface that VIC uses.
>>    Derek
>>Fred Dech wrote:
>>>thanks, Derek.
>>>but what i don't understand is this.
>>>if the Spectra8 currently uses WDM drivers in Windows...
>>>VIC relies on VFW type drivers.  that's what the problem is/was with the
>>>newer WDM driver Winnov Videum cards and VIC.
>>>i'm missing something.
>>>On Tue, Jul 12, 2005 at 04:38PM, Derek Piper said:
>>>>    Hi,
>>>>    Having installed a Spectra8 after using a WinTV 150PVR, I can
>>>>tell     you it's *very easy* to get going. Yes, each input installs
>>>>a driver individually (4 goes round the 'found new hardware' wizard -
>>>>yawn, but once it's done it's done). After that it just works like 4
>>>>individual capture cards. As mentioned before, the inherent problem
>>>>with VIC not being able to differentiate between the sources and
>>>>'colliding' over what input to use still remains, but that's Windows
>>>>thing and happens any time there is more than one capture device. You
>>>>just have to select the 'other' source(s), whatever they may be, when
>>>>the window prompts you and all sources will come up nicely.
>>>>    Spectra8 cards, being 4 BT878 chips, would work nicely under
>>>>Linux     and not suffer from that problem (they'd just be
>>>>/dev/video0, /dev/video1 etc.), although I have not personally tested
>>>>    Derek
>>>>Fred Dech wrote:
>>>>>this has been covered in various ways at various times.  but i've got
>>>>>a new question on this subject.
>>>>>we had a problem with the last Winnov Videum card we spec'd for another
>>>>>institution because before they purchased the card the Videum been
>>>>>to WDM drivers.  while the VFW drivers would make it work right for
>>>>>AG, this
>>>>>other institution needed to use the software that came with the
>>>>>capture card.
>>>>>i've noticed quite a few posts by people successfully using the
>>>>>4 input card.  so i've now come to the point of replacing that Winnov
>>>>>Videum with something that will cover all the needs of our
>>>>>proprietary capture software and AG.
>>>>>i'm looking at a web page with Spectra8 specifications.  i'm very, very
>>>>>surprised to see, "... each frame grabber channel has it's own WDM
>>>>>allowing you to capture from 4 individual video channels."
>>>>>now i'm really confused.  is the WDM driver relatively recent for the
>>>>>Spectra8?  it must be... or how have people made it work well with
>>>>>any insights would be greatly appreciated.
>>>>Derek Piper - dcpiper at indiana.edu - (812) 856 0111
>>>>IRI 323, School of Informatics
>>>>Indiana University, Bloomington, Indiana

Derek Piper - dcpiper at indiana.edu - (812) 856 0111
IRI 323, School of Informatics
Indiana University, Bloomington, Indiana

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