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I am about to try grab(), according to the documentation: "The primary use of the function is in multi-camera environments, especially when the cameras do not have hardware synchronization. That is, you call VideoCapture::grab() for each camera and after that call the slower method VideoCapture::retrieve() to decode and get frame from each camera. This way the overhead on demosaicing or motion jpeg decompression etc. is eliminated and the retrieved frames from different cameras will be closer in time.

Also, when a connected camera is multi-head (for example, a stereo camera or a Kinect device), the correct way of retrieving data from it is to call VideoCapture::grab first and then call VideoCapture::retrieve() one or more times with different values of the channel parameter. See https://github.com/Itseez/opencv/tree/master/samples/cpp/openni_capture.cpp"

from here: http://docs.opencv.org/modules/highgui/doc/reading_and_writing_images_and_video.html

I'll let you know!

I am about to try grab(), according to the documentation: "The primary use of the function is in multi-camera environments, especially when the cameras do not have hardware synchronization. That is, you call VideoCapture::grab() for each camera and after that call the slower method VideoCapture::retrieve() to decode and get frame from each camera. This way the overhead on demosaicing or motion jpeg decompression etc. is eliminated and the retrieved frames from different cameras will be closer in time.

Also, when a connected camera is multi-head (for example, a stereo camera or a Kinect device), the correct way of retrieving data from it is to call VideoCapture::grab first and then call VideoCapture::retrieve() one or more times with different values of the channel parameter. See https://github.com/Itseez/opencv/tree/master/samples/cpp/openni_capture.cpp"

from here: http://docs.opencv.org/modules/highgui/doc/reading_and_writing_images_and_video.html

I'll let you know!