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[NSRunLoop currentRunLoop] is not the same as in the main thread. see https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/F oundation/Classes/nsrunloop_Class/Reference/Reference.html "If no input sources or timers are attached to the run loop, this method exits immediately" The old code caused grabFrame() to return immediately if the capture was not done in the main thread. This code works correctly, even in secondary threads, provided that all capture functions are called in the *same* thread
OpenCV: open source computer vision library Homepage: http://opencv.org Online docs: http://docs.opencv.org Q&A forum: http://answers.opencv.org Dev zone: http://code.opencv.org Please read before starting work on a pull request: http://code.opencv.org/projects/opencv/wiki/How_to_contribute Summary of guidelines: * One pull request per issue; * Choose the right base branch; * Include tests and documentation; * Clean up "oops" commits before submitting; * Follow the coding style guide.