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Re: requirements for Darwin, etc.

From: "Fred F. McKinnon" <email@hidden>
Subject: requirements for Darwin, etc.

I was reading on Apple's site about Darwin - - - seems that it can be
installed and used on our Linux servers ... but I have a client who
is wanting to broadcast their church services "live" via QuickTime
streaming.

I need to find out - assuming we could configure Darwin on our
servers ... what software/hardware requirements would be necessary
for the customer (broadcaster) to have at their location?

Fred, you will need:
1. A video camera to capture the live video. A miniDV camcorder should work fine, the more $$ you spend, the better the optics, the chips and audio inputs.
2. Decent audio capture. As the camera might not be close to the action, you may need wireless mics. Samson Airlines work well, are inexpensive and have mini-1/8 connectors for consumer cameras. You may need to mix the audio from several sources before going into the camera. You can always go wired if you need to also.
3. You send the camera video/audio via firewire to a small Mac: iBook, PowerBook, Mac Mini, etc. They all have enough CPU power to encode.
4. Now you need a QuickTime software encoder. Maybe encode a live audio AAC stream at 20-30 kbps for the modem folks (still many out there) and one or two live vide streams, say 100 kbps and 300 kbps.
With Wirecast http://www.varasoftware.com/products/wirecast/
you can steam more than one live video stream from the same camera. And, Wirecast works with PCs now. It also does a lot more.

QT Broacaster is basic, Mac only and free, http://www.apple.com/ quicktime/broadcaster/
It can only stream one live video from one source (well, some have found the secret sauce to do more than one, but it's mostly for the brave). QTB can do multiple live audio streams.
Or it can do several audio and one live video stream from one camera. You just copy/paste different versions of the app, one for each stream.
No other software needed. You will need enough bandwidth to send the live streams from the church to your DSS.
There can be firewall and NAT issues. The easiest solution is to stream over port 80 if you can, and have dedicated IPs.
To configure the server, there is lots of good stuff at http:// www.soundscreen.com/index.html
and the DSS admin guide http://developer.apple.com/darwin/projects/ streaming/

If you do a lot of QT streaming, after a while you might be better off with QTSS, it has a lot more GUI and monitoring capabilities.
It only comes with OSX Server and only runs on Macs. You don't need an XServe. A 10-client version is $500 ($250 educational) but it allows unlimited apache and QTSS clients.
Good luck, and come back if you have specific questions or problems. There is a lot to this stuff, but it's not that hard to get it all up and running.

Frank Fulchiero
Digital Media Specialist
Connecticut College


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