Pyro Industries API-1394PCI Uživatelský manuál stáhnout pdf (Strana 234)

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■ EXPORTING

no-brainers: If you select Use Marks in your Export dialog box, and the clip in the bin

has no marks, there will be no audio exported.

There are two choices of audio format when exporting: WAV files and AIFF-C

files. WAV files originated with Windows PCs and now are compatible with Quick-

Time. Thus they can also be used with Macs. The other format, AIFF-C, is pretty much

the professional audio industry standard. Almost all audio workstations and applica-

tions that use audio will accept an AIFF-C format.

You also have a sampling choice (see Figure 6.15). If you intend to create a file

for an audio CD, you’ll need to use 44.1 kHz sampling. If you’re doing an export of DV

material not intended for audio CD using four channels of sound, 32 kHz is the normal

sampling rate. And if you have audio sources sampled at the higher (and thus superior)

rate of 48 kHz, you can use them for the file. Again, the end purpose will normally define

which setting to choose. You can also default to the sample chosen for your project.

Audio files can be exported as either mono or stereo. Any stereo exports will

include panning that was set in your edited sequence or source clip. Be careful not to

inadvertently cause volume to double by panning one track center and the other to one

side. When using stereo, it’s WYHIWYG (what you hear is what you get). Fortunately,

most audio exports go fairly quickly. So if you mess it up, you can go back and re-

export the file.

Finally, you must select a sampling size. Audio editing has developed to the

point where sampling size is incredibly accurate. As a result, the old industry standard

of 16-bit audio has been superseded by 24-bit audio, which is superior (but not that

detectable to most non-audiophiles).

You can choose the larger sampling, but before you do, make sure that wherever

the file goes, the equipment can support it. Some audio facilities still use 16-bit audio

and have no intention of changing that standard anytime soon. Better to contact the

audio facility than to export the wrong sampling size. Audio post facilities also fre-

quently have the capability to downsample. For most consumer audio uses and pro-

grams, you are probably safest at 16-bit audio.

Figure 6.15 Audio sampling

rate selection dialog box

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Pyro Industries API-1394PCI Uživatelský manuál Strana 234