Apple QuickTime Informações Técnicas descarregar pdf (Página 61)

Chapter 6 Setup Example 61

To set up and manage QTSS, you use the Server Admin application, which is installed

with Mac OS X Server (version 10.4 or later). After configuring Mac OS X Server, you can

also use the web-based administration application, Web Admin, to manage QTSS

remotely from any computer connected directly to the local network or to the Internet.

For this example, we assume that the broadcaster laptop in the streaming setup

illustration is also used for this purpose.

Although the Xserve comes with Mac OS X Server and QTSS preinstalled, the software

must be configured for the particular network to which it is being added and for the

specific uses to which it is to be put. For information on setting up Mac OS X Server, see

the getting started guide.

Among the questions to be answered when setting up your streaming server are the

following:

Can the server computer be dedicated solely to streaming?

It’s best if your streaming server doesn’t also have to handle web serving, mail serving,

and other server tasks. This example is for a dedicated streaming server.

How much random access memory (RAM) is needed?

The minimum required to run QTSS is 128 megabytes (MB). Estimate about 256 MB of

RAM for every 50 MB of throughput you plan to serve. This setup assumes 256 MB of

RAM.

How much hard disk storage is needed?

Video files can be large. A hinted one-hour presentation encoded at 300 Kbps (not

optimized for a server) takes up approximately 135 MB of hard disk space. A 60 GB hard

disk can store more than 400 such presentations.

Note: Here’s a formula for calculating streaming file sizes:

dataRateInBits / 8 bits * timeInSeconds = file size

Example for a one-hour 300-Kbps stream:

300,000 / 8 bits * 3600 = 135,000,000 bytes = 135 MB file size

Many local networks include redundant arrays of independent disks (RAID) storage

systems, which provide much larger amounts of hard disk space.

If you store streaming files anywhere other than the QTSS default location (/Library/

QuickTimeStreaming/Movies), you’ll need to enter the path in the Settings pane of

QuickTime Streaming in Server Admin (see “Changing the Streaming Media Directory”

on page 30). Place any Session Description Protocol (SDP) files referencing live

webcasts in the same location so they can be recognized by QTSS.

In this example, all archived streaming files and SDP reference files reside in the default

Movies folder on the streaming server.

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Apple QuickTime Informações Técnicas Página 61