When exporting tracks to AAF or OMF, Pro Tools provides the following OMF/AAF Options:
If the Enforce Avid Compatibility option is enabled, all AAF and OMF files and sequences will meet the specific requirements of Avid Video workstations. Sample rates are limited to 44.1 kHz or 48 kHz. Exported clips will be padded to the nearest frame boundaries (Quantize Edits to Frame Boundaries). This padding ensures that the placement of a file in the Timeline will be the same on sample-accurate as well as frame-accurate systems.
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Select the timecode format for the project into which this file or sequence will be imported. This may be different from the timecode format of the current session. This parameter allows clips to be placed correctly in sessions with different timecode formats, and also calculates how many samples must be added to pad clips to frame boundaries.
Pro Tools allows sample-accurate placement of clips. In Pro Tools, you can place a clip of any length at any position, without any requirement for aligning clips with frame boundaries.
However, most video editing programs, such as Media Composer, only support frame-accurate editing. In these programs, you can only edit sounds on whole frame boundaries, limiting your precision.
The Quantize Edits to Frame Boundaries option allows Pro Tools to export your sample-accurate Pro Tools edits into an AAF or OMF file so they appear as frame-accurate.
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When you quantize edits to frame boundaries, you must enter a handle size (length) under Audio Media Options. See Consolidate Handle Size (Milliseconds).
A master clip consisting of the clip plus the handle size (length) on both front and back will be exported. The exported sequence creates a subclip which is equivalent to the original clip, but extended to the farthest frame boundaries. For example, 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 extends the clips, extra audio may be heard. To prevent this extra audio from playing, special one-frame sound files are rendered to duplicate the original boundaries of the clip. In the exported sequence, 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.
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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.