The Connectix QuickCam & frame rates

Michael Sattler, San Francisco (msattler@jungle.com)
Sat, 5 Nov 1994 20:41:02 -0500


There's been some discussion about the ability of the Connectix QuickCam to
deliver audio and video thru a modem. There were questions about the frame
rate (and how to specify it). I said that I thought QuickTime took care of
it, but I wasn't sure, not having broken the spine on my volume of Inside
Mac: QuickTime. I forwarded some of our messages to the QuickCam project
manager at Connectix. His reply to us follows:

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You can ask QuickTime for a frame rate, but it will only deliver what it is
capable of, one of it's endearing features. QT always guarantees that the audio
is continuous, then fills in as many frames as the device can handle, trying to
keep syncronization as best it can. So, with QT in control of modeming, you
might get continuous audio and <1 frame a second video. That's why everyone is
working on video conferencing software. Products like CU-SeeMe do compression
and other tricks to try and keep the frame rate up over whatever lines they're
on.

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Michael Sattler <msattler@jungle.com> San Francisco, California
http://www.wco.ftp.com/~msattler/
LOOKING FOR WORK: technical manager, software engineer, trouble-shooter
of systems and networks everywhere, documentation writer and trainer; on
the streets after the untimely death of an entire west coast development
office. Extra points given for advanced technology and network access.