questionswhat is the best way to stream an hd webcam…

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Do the TVs (or anything connected to them) have internet access?

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Connect both TV's to the same desktop computer (with two video outputs set to mirroring) and have the desktop computer set to use ustream to both broadcast to the Internet and to mirror the video to the screen.

Describing the actual purpose rather than the end result might give you some more productive suggestions, but the above will accomplish that.