Multiple cameras

cameras

asked 2012-07-04 04:56:34 -0600

AlexanderShishkov

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How to use 2 cameras (multiple cameras) with OpenCV library?

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answered 2012-07-04 06:52:36 -0600

Daniil Osokin

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updated 2012-07-04 08:47:59 -0600

Kirill Kornyakov

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Hi!

VideoCapture(int device)

parameter allows to specify the camera index. Here is documentation.

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But how can you enumerate the devices? How can you know the existing device number and which camera is which?

Adi ( 2012-07-05 01:11:18 -0600 )edit

@Adi usually the first camera that you plug in gets assigned as 0 and every camera you add is ennumerated+1 from there in ;inux

benzun ( 2012-11-20 11:38:43 -0600 )edit

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answered 2014-01-19 09:39:57 -0600

SpiderGears
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Additionally you might encounter problems when using two cameras simultaneously specially on a USB 2.0 interface. The first camera connected to USB host tries to reserve all the available bandwidth leaving nothing for the second cam. Error Message: VIDIOC_STREAMON: No space left on device

Solution:

Calculate bandwidth required manually and make appropriate configurations.
Put cameras on different USB hosts.

Ref thread http://answers.opencv.org/question/4909/using-2-webcams-simultaneously/

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