North American Network Operators Group|
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical
RA/RV Feeds from RBN
Time to take a moment and describe today's feed from the encoding perspective. We do lots of on-site coverage, and usually bring in a dedicated ISDN for the encoder feed back to the server(s) and out to the network. In UDP mode, our encoder and server can buffer quite deeply (say, 300 seconds) to accommodate some pretty significant network outages. Until today, we couldn't imagine a scenario where this wasn't good enough, but as luck would have it, we were wrong. Fortunately today's net problem was resolved by the end of the general session and Tuesday *should* be much cleaner. On the subject of camera positioning and exposure, we know, it was not good. I think we can pull together a somewhat more coherent set of post-produced presentations with what we have on tape -- we'll find out when we get a look at them. But we should have better cameras, a video switcher, and somewhat better lighting to do this virtual conference thing right. Next meeting? I heard lots of questions on multicast today...here's how it works with RealMedia. If you have decent MBONE connectivity, you'll negotiate multicast when you connect to the audio or video stream. If you don't, the client falls back to unicast UDP mode. If even that fails (say you're behind a firewall), it rolls to TCP mode, and will ultimately resort to HTTP "cloaking" if nothing else works. Users can override the automated fall-back through the preferences dialog if there's a strong preference for a particular mode. Jeffrey Payne, GM Broadcast Operations RealNetworks, Inc.