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62 Chapter 3
Will it be necessary to set up a broadcaster user account on the streaming
server?
In this example setup, it will be necessary to create a broadcaster user account, because the
encoding software and QTSS are on separate computers. This allows a Session Description
Protocol (SDP) file to be created on the server by the encoding software, which QuickTime
Broadcaster does automatically if the Automatic Unicast (Announce) transport mode is
selected. The SDP file provides information about the format, timing, and authorship of a live
streaming broadcast. Once specified, the user name and password will be entered through
QuickTime Broadcaster.
For instructions on creating a broadcaster user account, see “Using Automatic Unicast
(Announce) With QTSS or DSS on a Separate Computer” on page 43. You’ll need to use the
administrator computer previously set up to create this account.
Note: The broadcaster user name and password can be changed using the
StreamingServerAdmin UI, which in this example can be accessed from the laptop browser.
Finally, will users require authentication to access live or archived
presentations?
In our example setup, no authentication is necessary. However, if you want to restrict access
to your streams, you’ll need to set up password-protected individual user or group accounts.
For information on how to set up and manage such accounts, see the appropriate topics
under Security in Chapter 2.
Step 4: Set Up for a Live Webcast
For the example setup, the following items are needed:
m good-quality DV camera
m microphone placed near the speaker, either on a stand or clipped to the speaker’s
clothing, connected by good-quality audio cable to the DV camera audio input
m sturdy tripod on which to mount the camera
m portable lighting kit
The Camera Is the First Link
Since the camera is the first link in the video signal chain, it is very important. Two main
things determine a DV camera’s picture quality:
m Lens quality. The better the lens, the better the image.
m Image capture mechanism. DV cameras use charge-coupled devices (CCDs) to convert
the picture into electronic signals. The number and size of the CCDs affect the quality of
the image.
Optical zoom gives better quality than digital zoom, but zooming should be avoided or
kept to a minimum when streaming a live presentation to avoid degrading the stream.
LL0329.book Page 62 Wednesday, November 20, 2002 2:09 PM