Re: MBone services

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1 total messages Started by Peter Parnes Thu, 08 Oct 1998 00:00

#130

Author: Peter Parnes
Date: Thu, 08 Oct 1998 00:00

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J.Crowcroft@cs.ucl.ac.uk said:
> i would have a hard time seeing how significant amounts of Real Video
> would be allowed to be _unicast_+ to multiple simulataneous receivers
> on any sensibly run ISPs net....certainly we wouldn't allow it on ours
> and we have 155Mbps access per site and >1M hosts....

Quite right. I just wanted to share some real-life information about a 
"broadcast" we (Marratech AB) did a number of months for a customer. The 
situation was a asymmetric media-broadcast where audio, video and HTML slides 
was sent out from a large auditorium. The total seminar was over four days 
with electronic reruns in the afternoons.  This broadcast was transmitted over 
the company's internal network and was done using two different tools 
simultaneously, RealMedia (unicast) and Marratech mPlayer (multicast). During 
the second day of the broadcast the number of simultaneous RealMedia listeners 
increased to 73 at which point the network department of our client freaked 
out as they saw the network load increase way above the normal level and they 
just shut of the connection the RealMedia server internally and the guys doing 
the RealMedia boradcast were only allowed to record the media for later 
retrieval. During the broadcast we (with Marratech mPlayer) peaked at above 
400 listeners out of potentially 1500 which had the mPlayer client installed.

Also note, that the RealMedia session included audio from the presenter and 
video which 99% of the time showed the projector screen (to get the slides). 
On the other side the Marratech session included the same audio but instead of 
showing the slides by filming the projector screen we sent the slides out 
using HTML pages (we had access to all presentation material before the 
sessions started so we could quickly convert the PowerPoint presentations to 
HTML) and finally we broadcast a video feed of the presenter instead of the 
slides.

Just thought someone might be interested in this. If not, just ignore my 
babbling (I still haven't had any coffee today :-)

/P

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