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Re: Webcast
There are a few ways to do it. I believe NASA uses Real Media Server, of which there's a free version that can handle 25 clients (the unlimited server is $2k or so), and they probably send it the feed via Real Producer (basic is free, gold is $200). It can be run on probably Windows, OS X, and Linux.
I'm sure there are hosted servers where you can pay a fee to use their broadcasting server for x amount of viewers at x quality, because it needs a pretty good chunk of bandwidth for a lot of people. What you'd need is a broadband connection with decent upstream bandwidth at the competition to get the video to the broadcaster at high quality.
I'd imagine you'd need a few computers at the competition, especially if you want to use multiple cameras and have graphics on the screens, etc.. like the NASA broadcasts. They should probably be pretty powerful and have quite a bit of RAM.
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