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I’m looking for some general way to get video stream from webcam in Linux and then process and show it in a window. The second part seems simple, but I don’t know how to deal with the first one.
Is there some API, lib, docs, etc?.. Where to start?
I’ve done a little of this before, and you’re right, the second part is the easy part. You should take a look at this post for some of the commonly used libraries.
Video capture on Linux?
I would also throw OpenCV on that list, since it helps with both the obtaining and the processing of video streams:
http://sourceforge.net/projects/opencvlibrary/
http://www.willowgarage.com/pages/software/opencv
Good luck!