I see only one WEB camera

[Iskander]

Hello all

I have LV 7.1

I installed the two same identical WEB camera.

But in the LV I can see only one WEB camera - the first . The second cemera I don't see in the LV

Why ?

Respect

Iskander

[Bob_Y.]

Iskander;

I assume that you are using this: http://sine.ni.com/devzone/cda/epd/p/id/5030

The first of the known issues is that it can only work with one webcam.  I am not sure if there is an updated version that will work with multiple cameras, but I do know that it is a very requested feature.  I would love to see it updated as well.

Hope that this helps,
Bob Young

[Iskander]

Hello Bob Young

Thanks for the answer.

I installed two the same identical web cameras

And I received the image from first web camera.

Then I switch from 1 to 2 camera. I want to receive the image from second camera, but I received  the image from first web camera. I can't receive the image from seconb web camera

When I have two different web cameras - I can received image from any camera.

Respect

Iskander

[Matthew_Kelton]

If you look at your code, you're passing the USB camera name into the VI to init.  Are the names of the camers coming back as being identical?  If so, then my guess is the driver does a 1D array search and always finds the first camera.  I don't have any of the supporting VIs installed on my system, but you may want to see if you can delve into the IMAQ USB Init.vi and IMAQ Enumerate USB Camers and see if you can generate unique names for identical cameras.

[Iskander]

Thanks for the answer

I added the Front Panel of the my VI with names of the WEB camers.

In the Window "My Computer" I can see image from two WEB camers.

In the LV I can see image from first  WEB camer.

Regards

Iskander

[DJ_L.]

Hey Iskander,

The problem lies with your specific USB camera's driver in that it is not giving the cameras a unique camera name. There are a couple of solutions in the KB.

Also, since you are using the NI-IMAQ for USB Cameras driver, you will also want to check out some of the Known Issues that are now documented on the download page for the driver. First, this driver only supports acquiring from one USB camera at a single time, so you might want to consider using Firewire or GigE cameras. Second if you are considering using 2 USB cameras, you might be thinking that you can just acquire from one, close its session, then acquire from the other, and then go back and forth by acquiring and closing the sessions each time. But then another issue you will run into, if you do this in your program, is the second known issue of the IMAQ for USB Cameras driver, - Opening and closing a camera session causes a small memory leak, so it is not recommended to do this repeatedly.

Regards,

DJ L.

[Iskander]

Hello

Thanks

I understanded

Regards

Iskander

[Iskander]

Hi

I have anoter problem

My PC has 2 Win XP (Russion) and 2 LV8.0

I connected Web camera to PC

But I received image from Web cemera only first Win XP . On the second Win XP I received the Error. 

here

http://forums.ni.com/ni/board/message?board.id=170&message.id=277467&view=by_date_ascending&page=1

Driver for WEB cameras I have changed on the every  Win XP 

What do I do

Regards

Iskander

Message Edited by Iskander on 10-17-2007 03:11 AM

[Iskander]

Excuse me

All are working

Regards