How to count cameras in OpenCV 2.3?

Question

I want to get the number of available cameras.

I tried to count cameras like this:

for(int device = 0; device<10; device++) 
{
    VideoCapture ca         


        

Answer 1

OpenCV still has no API to enumerate the cameras or get the number of available devices. See this ticket on OpenCV bug tracker for details.

Behavior of VideoCapture is undefined for device numbers greater then number of devices connected and depends from API used to communicate with your camera. See OpenCV 2.3 (C++,QtGui), Problem Initializing some specific USB Devices and Setups for the list of APIs used in OpenCV.