Re: color video?

Randolph Chung (rc42@cornell.edu)
Sun, 18 Sep 1994 12:58:14 -0400


In message Sun, 18 Sep 1994 12:41:55 -0400, T.Dorcey@cornell.edu writes:

> First note that network transmission rates are typically measured in
> kilobits/second (kbps) not kilobytes. So, the file you describe would
> actually require 297 kbps to transmit. More importantly,

I knew I was doing something wrong in my calculations.. =) sounded too good
to be true :>

> videoconferencing demands compression/decompression in real-time. I
> doubt that the compression ratio you observed with the Lion King clip
> could be achieved in real time on a typical Macintosh or PC. An

yes. I thought of that as well. The Lion King clip has a compression ratio of
I'd say about 20:1.. I guess also Cartons are a lot more compressable than
real video cuz there are not that many variations in cartoons.

> This is not to say that there won't be color available in the
> not-too-distant future. Just don't expect the video to be as good as the
> Lion King clip, and recognize that you will pay some price in reduced
> frame rate or reduced spatial resolution if you want to transmit color.

Actually, the clip's resolution/frame rate isn't all too good. Of course it
looks much better at 160x120. The audio quality was impressive though... out
of curiousity, are video data a lot more compressible than audio? (ie you
can use a more "loosey compression" technique with video?)

randolph
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Randolph Chung -=- Cornell University -=- Biochemistry/CS student
...................Tau-Squared Software programmer..................
Internet: rc42@cornell.edu CLASSlink: 20:256/4
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