I use OpenTok to develop a webapp that can stream up to 2500 subscribers. OpenTok handles most of the work for you, but it doesn’t allow you to take screenshots - which is very important for my webapp. To enable screen sharing, I'm looking for open source plugins / drivers that I can ask broadcasters to download and install, and the plugin needs to capture the screen and share it like a virtual webcam so that services like OpenTok can broadcast / archive / store them.
How do you keep writing such a driver? Do you know any open source project that can serve as a good starting point?
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