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From iMovie to QuickTime > From iMovie to QuickTime - Pg. 305

examples of the kind of fle-size increase you can expect for each of several popular rate and size settings. (Note that the information here is per channel. If you're going for stereo, double the kilobyte ratings shown here.) ·11kHz,8bits. Sounds like you're hearing the audio track over a bad telephone connection. Tinny. Use it only for speech. 662 K per minute. ·11kHz,16bits. Sounds a lot better. Roughly the sound quality you get from the built-in Mac speaker. 1.3 MB per minute. ·22kHz,16bits. Starting to sound very good. Suitable for playing on a computer equipped with external speakers. 2.6 MB per minute. ·44.1kHz,16bits. This is the real thing, the ultimate audio experience. CD-qual- ity audio. Suitable for listening to with headphones. The ultimate storage and transmission headache, too--this much data requires 5.3 MB per minute, mono. But of course, you'd never go this far without also including the stereo experience (make that 10.6 MB per minute in stereo). Use: Mono/Stereo These radio buttons let you specify whether or not your movie's soundtrack is in ste- reo. As noted earlier in this chapter, exporting your QuickTime movie with a stereo format is often a waste of data. Most computers that might play back your movie, including tower Power Macs and iBooks, don't have stereo speakers. Furthermore, even though most camcorders include a stereo microphone, there's virtually no separation between the right and left channels, thanks to the fact that the microphone is mounted directly on the tiny camcorder. Nor does iMovie let you edit the right and left audio channels independently. Even if people are listening to your movie with stereo speakers, they'll hear essentially the same thing out of each. Therefore, consider using the Mono setting when you're trying to minimize the amount of data required to play back the soundtrack. The Expert Settings The Video Codecs: A Catalog When you decide to export your iMovie production as a QuickTime movie, you can get a great deal of control out of how the Mac produces the resulting movie fle by choosing Expert from the dialog box shown in Figure 12-1, then clicking Options (Figure 12-5), and then clicking Settings (Figure 12-6). You get access to a long list of codecs. As you can read in this listing, few of these codecs are very useful for everyday use. Many of them are designed for saving still frames (not movies), for storing your movies (not playing them), or for compatibility with very old versions of the Quick- Time software. Most of the time, the compressors called Sorenson Video 3 (for CD playback), H.264 (for hard drive playback), or Apple H.263 (for Internet playback) are the ones that will make you and your audience the happiest. chapter12:fromimovietoquicktime 305