ADOBE PREMIERE PRO 2.0
User Guide
385
Audio export settings
The following options are available in the Audio panel of the Export Movie Settings dialog box and the Export Audio
Settings dialog box:
Compressor
Specify the codec for Adobe Premiere Pro to apply when compressing audio. The codecs available
depend on the File Type you specified in the General panel in the Export Movie Settings or Export Audio Settings
dialog box. Some file types and capture cards support only uncompressed audio, which has the highest quality, but
uses more disk space. Check with your capture card’s documentation before choosing an audio codec.
Advanced Settings
Click to access codec-specific options. This option is not available for all codecs. Consult the
codec’s documentation or its developer’s website for more guidance on choosing advanced settings.
Sample Rate
Choose a higher rate to increase the frequency at which audio is converted into a discrete digital value,
or
sampled
. Higher sample rates increase audio quality and file size; lower sample rates decrease quality and file size.
However, setting the sample rate higher than the audio’s sample rate at the time of recording will not increase quality.
Setting a different rate than the source files’ audio, or
resampling
, requires additional processing time. You can avoid
resampling by capturing audio at the same rate at which you want to export it.
Sample Type
Choose a higher bit depth to increase accuracy of audio samples, which can improve dynamic range
and reduce distortion, especially if the audio undergoes additional processing, such as filtering or resampling. Higher
bit depths also increase processing time and file size; lower bit rates reduce processing time and file size. However,
setting the bit depth higher than the audio’s bit depth at the time of recording will not increase quality.
Channels
Specify how many audio channels are in the exported file (see “About channels in audio clips” on
page 174). If you choose fewer channels than are in the sequence’s master track, the audio will be downmixed (see
“About audio tracks in a sequence” on page 173).
Interleave
Specify how often audio information is inserted among the video frames in the exported file. See your
capture-card documentation for the recommended setting. A value of 1 frame means that when a frame is played
back, the audio for the duration of that frame is loaded into RAM so that it can play until the next frame appears. If
the audio breaks up when playing, the interleave value may be causing the computer to process audio more
frequently than it can handle. Increasing the value lets Adobe Premiere Pro store longer audio segments that need to
be processed less often, but higher interleave values require more RAM. Most current hard disks operate best with a
1/2- to 1-second interleave value.
Adobe Media Encoder
About the Adobe Media Encoder
The Adobe Media Encoder is an encoding mechanism employed by programs such as Adobe Premiere Pro, Adobe
After Effects, and Adobe Encore DVD for output to certain media formats. Depending on the program, the Adobe
Media Encoder provides a specialized Export Settings dialog box that accommodates the numerous settings
associated with certain export formats, such as MPEG-1, MPEG-2, and those designed for delivering content over
the web. For each format, the Export Settings dialog box includes a number of presets that are tailored for particular
delivery media. You can also save custom presets that you can share with others or reload as needed.
Although the Export Settings dialog box’s appearance varies slightly and it is accessed differently in each program,
its general form and function are consistent. The Export Settings dialog box always contains an area for specifying
general export settings (such as the Format, Range, Preset, and tracks to export) and an area with tabbed panels. The
types of tabbed panels available depend on the format and preset you specify. A panel menu also contains commands
specific to the selected format.