Specifications

Pro Tools Reference Guide384
ple, if the clip starts at 1:15 and 500 samples, the
subclip would start at 1:15; and if the clip ends at
4:00 and 500 samples, the subclip would end at
4:01.
Because quantizing edits to frame boundaries ex-
tends the clips, extra audio may be heard. To pre-
vent this extra audio from playing, special one-
frame sound files are rendered to duplicate the
original boundaries of the clip. In the exported se-
quence, these one-frame files are placed over the
start and end frames of the extended clip so you
cannot hear the extension.
One-frame files (OFFs) are imported into Avid
workstations as part of the AAF or OMF sequence
like any other sound file. In the Avid Timeline,
they appear as one-frame edits on either side of a
subclip.
If you decide you need to extend the subclip at any
point, discard the OFF and trim the subclip as
needed.
Export Stereo, 5.1, and 7.1 Tracks as Multi-
Channel
Select this option to make Pro_Tools export audio
from multi-channel tracks as multi-channel audio
files, rather than sets of multiple mono files.
Sample Rate Conversion
Options
These settings allow you to convert the sample rate
of your Pro Tools session during export to AAF or
OMF by sample-rate converting each audio file,
and adjusting the edits in the resulting AAF or
OMF file to compensate for this change.
You might want to change the sample rate of a ses-
sion if you are exporting to a system or are at a
stage in the process that requires a different sample
rate.
For example, your session contains audio media at
29.97 fps (NTSC video) at 48 kHz, while the film
composer to whom you are exporting your session
requires audio media at 24 fps (film speed) at 48
kHz. To convert all the audio files and edits to play
back at 24 fps (film speed) at 48 kHz, you would
set the Source Audio Sample Rate setting to
48,048 (a pull up rate of 0.1%) and the Destination
Audio Sample Rate to 48,000. These settings tell
Pro Tools that you want to fit 48,048 of the origi-
nal video speed samples into 48,000 of the new
film speed samples. With these settings, you sam-
ple-rate convert the video material to film speed.
This solution is only available when you
export a sequence, not when you export
individual files.
If Quantize Edits to Frame Boundaries is se-
lected, Pro Tools volume automation will not
be exported.
Sample Rate Conversion Options
See “Speed Correction for Film, NTSC Video,
and PAL Video” on page 1164, for information
about converting between different speeds and
sample rates.
Check the Audio and Video pull options be-
fore applying a sample rate conversion to
the entire session.