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As the opencv library does not provide function to open the specified camera,so i use the
CCameraDS class implements with DirectShow. Unfortunately, when i open more than 3 cameras
in the same time, the program dead!!!what i do? Is that anyone like me?
With multiple USB cameras you need to be aware of limited USB bandwidth – this is the most likely reason of unexpected video capture behavior. Make sure to search, this is a duplicate of over a dozen of similar questions.
Solution might be to reduce video resolution, frame rate, to use compressed capture formats, to attempt to use different hubs or just switch to non-USB hardware.