"Cannot Start Video Chat" error when trying to do video conferences

Question

Ahoy!
I've recently upgraded to a new still camera that unfortunately doesn't work with iChatUSBCam, so I invested in a nearly-new iSight to use with my PowerMac G4 instead. Although one-way video chat conferences work fine, I keep getting the error "Cannot Start Video Chat" whenever I try to do a video conference.
The full error message reads:
"*Cannot Start Video Chat*
Your computer is not capable of initiating a multiperson video chat.
Click Text Chat to invite the selected people to chat."
There are no error codes or any other text in this message. The available buttons are the purple ?, 'Text Chat' or 'Cancel'.
I have tried this on both my 1.25ghz PowerMac G4 and my 1.33ghz PowerBook G4, and my friends I am trying to chat with have tried to initiate the conference on their 2.16ghz Intel Core Duo MacBook and MacBook Pro, only to receive the same messages too.
When doing a one-way videochat, the + button to add more people to the conference is greyed out for all of us as well. We all display the video conference button (camera with the extra pages behind it) next to our names on our buddy lists though, so our computers all believe we're capable of it!
When clicking the ? button on the "Cannot Start Video Chat" dialogue, it brings me to the help page that tells me:
+"To join a multiperson video conference, you need any G5 computer, or a 1 GHz single processor G4, or a dual processor 800 MHz G4, and a broadband connection to the Internet.+
+To host a multiperson video conference, you need any G5 computer, or a 1 GHz dual processor G4. In addition, you need an Internet connection that supports a minimum download bandwidth of 384 Kbps, and a minimum upload bandwidth of 384 Kbps."+
Both of my machines are above 1ghz G4s, so according to this help file, it shouldn't prohibit me from at least joining a conference when I'm not the host, but both of my Intel-based friends get the same message when trying to host as well. We are all on respectable Broadband or Cable internet connections, so that shouldn't limit it!
Anyone got any ideas what the problem is and how to fix it? I see no reason why this shouldn't work!
Thanks!

Answer 1

Hi
First have you all set the Quicktime streaming setting, goto sys prefs/quicktime/streaming/streaming speed, set to 1.5mbps(dont use automatic)
In ichats prefs click on video and change bandwidth limit to NONE.
Restart iChat.
Do a speed test on all sides and tell us the UP AND DOWNload speeds http://www.speedtest.net/
Tony