Apple 7.2 manual Preparing Movies for Internet Delivery, Customizing Sound Export Settings

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Customizing Sound Export Settings

To customize sound settings for export:

1Choose File > Export.

2Choose “Movie to QuickTime Movie” from the Export pop-up menu.

3Click Options.

4In the Sound area of the Movie Settings dialog, click Settings and then choose your options:

ÂFormat: 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.

ÂChannels: Choose between mono (1 channel) or stereo (2 channels).

ÂRate: 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.

ÂRender Settings: Choose the quality of the signal processing that will be used; higher quality settings take longer to process.

ÂOther 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:

ÂWith 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.

ÂReal-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.

Chapter 4 Exporting Files with QuickTime Pro