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OpenCV 4.0 count cameras number

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Dear all, I would like to set a code to count the number of active cameras detected by OpenCV-4.0. To achieve my goal, I used a for loop, because I didn't found how to do it by another way. Apparently, it is no part of the API. Does it exist another way to detect all the active cameras ? Thank you for your help and support. Regards,

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