audio. The codecs available depend on the File Type you specified in the General panel in
the Export 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.
Sample Rate
Choose a higher rate for better audio quality in an exported file, or choose
a lower rate to reduce processing time and disk-space requirements. CD quality is 44.1
kHz. Resampling, or setting a different rate than the original audio, also requires additional
processing time; avoid resampling by capturing audio at the final rate.
Using Help | Contents | Index Back 306
Adobe Premiere Pro Help Producing Final Video
Using Help | Contents | Index Back 306
Sample Type
Choose a higher bit depth and stereo for better quality, or choose a lower
bit depth and mono to reduce processing time and disk-space requirements. CD quality is
16-bit stereo. Stereo provides two channels of audio; Mono provides one channel.
Channels
Specify how many audio channels (see “About audio channels and tracks” on
page 173) are in the exported file. If you choose fewer tracks than are in the sequence, the
audio will be downmixed (see “Downmixing to fewer channels” on page 190).
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 1/2- to 1-second
interleaves.
Key Frame Rate
Type the number of frames after which the compressor will create a
keyframe when exporting audio.
Keyframe and Rendering export settings
When you choose Keyframe and Rendering options from the menu at the top of the
Export Movie Settings dialog box, you can specify the following settings as needed:
Fields
Choose an option if required for your final medium. No Fields is the default and is
the equivalent of progressive scan, the correct setting for computer display and
motionpicture
film. Choose Upper Field First or Lower Field First when exporting video for an
interlaced medium such as NTSC, PAL, or SECAM. The option you choose depends on
the
specific video hardware you use. See “Processing interlaced video fields” on page 145.
Deinterlace Video Footage
Select this option if the video content in the sequence is
interlaced and you are exporting to a noninterlaced medium, such as motion-picture film
or progressive scan video. Deinterlacing can also make it easier to apply high-quality
effects in another program, such as Adobe After Effects. If the sequence content does not
have fields, don’t select this option; instead select No Fields from the Fields option.
Optimize Stills
Select this option to use still images efficiently in exported video files. For
example, if a still image has a duration of 2 seconds in a project set to 30 fps, Adobe
Premiere Pro creates one 2-second frame instead of 60 frames at 1/30 of a second each.
Selecting this option can save disk space if you used still images. Deselect this option only
if the exported video file exhibits playback problems when displaying the still images.
Keyframe Every _ Frames
Select and type the number of frames after which the codec
will create a keyframe when exporting video.
