hello,
I want to read from usb port a video stream how this is done?
thanks in advance

Could you be a little less vague? I don't think this is quite as simple as you think it is. What's the device? Does it have drivers? Is there an API? What video/audio encoding does it use? What are you doing with the video?

There is no one solution for this. It is depedent on many factors, some of which I listed...

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