Simply right-click on any flash movie in ustream.tv (e.g. the one on the home page of ustream.tv) and set the microphone and camera to your iSight or whatever you want and done. My guess is that sometimes the Adobe Flash camera recording applet has messed up default settings. Thanks for the excellent support, Chris!
From email from Chris Yeh, ustream investor of some sort:
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Got my ustream.tv webcast to work with my Canon DV camera over Firewire. Here is my 'cast: Roland's Mundane TV. It wouldn't work with my iSight with my Power PC Powerbook G4. Strange but true :-) ! Guess the ustream.tv crew only tested with intel Macs!
I can't get ustream.tv to stream video with my Power PC Powerbook G4 and iSight. I know it works with MacBook Pros (because atmasphere got it to work). Any clues or workarounds would be appreciated. I have tried Firefox 2 and Safari. Email roland AT rolandtanglao.com or leave a comment.