Apple QuickTime 7.2 - Manual (Page 46)

46 Chapter 4 Exporting Files with QuickTime Pro
Customizing Sound Export Settings
To customize sound settings for export:
1 Choose File > Export.
2 Choose “Movie to QuickTime Movie” from the Export pop-up menu.
3 Click Options.
4 In the Sound area of the Movie Settings dialog, click Settings and then choose your
options:
 Format: Choose the compressor (codec) you want to use for compressing sound. For
general use and Internet delivery of music, MPEG-4 Audio (AAC) is recommended.
 Channels: Choose between mono (1 channel) or stereo (2 channels).
 Rate: Digitized sound is made up of sound samples. The more samples per second,
the higher the sound quality. To maintain quality, music requires a higher sampling
rate than spoken voice because music uses a wider range of frequencies. Audio CDs
use a sampling rate of 44.1 kHz.
 Render Settings: Choose the quality of the signal processing that will be used;
higher quality settings take longer to process.
 Other options: To see any additional options specific to your chosen codec, click the
Options button. if it’s available.
Preparing Movies for Internet Delivery
With QuickTime Pro, you can create movies so that they can be delivered over the
Internet. You can deliver a movie over the Internet in two ways:
 With HTTP download, the movie is downloaded to the client’s hard disk. Fast Start is
a QuickTime feature that enables users to watch or listen to media as it is being
downloaded (long before the whole movie has been downloaded) from a standard
web server to their hard disks. Fast Start works well for short-form movies where file
size is limited. It ensures high-quality playback regardless of users’ Internet
connection speeds, although those with slower connections will wait longer before
media starts to play.
 Real-time streaming provided by QuickTime Streaming Server (QTSS) delivers media
in real time over the Internet, from modem rates to broadband. No file is ever
downloaded to a viewer’s hard disk. Media is played, but not stored, by the client
software as it is delivered. You would choose real-time streaming rather than Fast
Start for webcasts of live events in real time, delivery of long-form video, 24/7
Internet radio and TV channels, and other cases in which you don’t files stored on a
user’s hard disk. QTSS uses the RTSP protocol.