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The VideoIn class lets you capture a live video signal. On each frame, the object will send a matrix out. If you need to use this matrix from another thread, you should make a copy with something like: cv::resize(*val.matrix_, copied_frame_, size_, 0, 0, CV_INTER_NN);

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This example make your computer heat... To do this it grabs a frame using *VideoIn* and displays it on screen with "":268 (after some downsampling). Using GLMat to display a preview of the content is not the best idea: you should use the *preview* method on VideoIn: video/preview(1) !267! h3. patch lib("lib") w = GLWindow() m = GLMat() w => m v = VideoIn() v => matrix~m