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

Thomas D. Uram turam at mcs.anl.gov
Wed Jul 13 09:38:26 CDT 2005

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.
>> --fred
>> 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
>>> it.
>>>     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
>>>> upgraded
>>>> 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
>>>> Spectra8
>>>> 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
>>>> collaborators;
>>>> 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
>>>> driver,
>>>> 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
>>>> AG...
>>>> any insights would be greatly appreciated.
>>>> --fred
>>> -- 
>>> Derek Piper - dcpiper at indiana.edu - (812) 856 0111
>>> IRI 323, School of Informatics
>>> Indiana University, Bloomington, Indiana

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