Specifications

Pro Tools Unity ISIS Guide6
Pro Tools with DigiTranslator 2.0 lets you im-
port AAF or OMF sequences containing embed-
ded audio files. You can also import AAF or OMF
sequences containing embedded video files, but
only if you are importing them to a video satel-
lite track. In such a case, only the video meta-
data is imported.
Frame-Rate Accurate Video
Editing and Sample-Rate
Accurate Audio Editing
Avid applications edit with frame accuracy. This
means that in a 30-fps project, you can edit at 30
different locations for every one second of
video. Pro Tools edits with sample rate accuracy.
In a 48-kHz session, there are potentially 48000
locations to edit for every second of audio.
When Pro Tools exports an AAF composition
destined for an Avid application, it must ensure
that the audio files line up on frame boundaries.
To do this, it might have to split an existing au-
dio region into three separate regions. For exam-
ple, the following illustration shows a 5-frame
video clip and a corresponding audio region. In
Pro Tools, the audio regions might not line up
on video frame boundaries.
In order to export frame accurate audio regions,
Pro Tools splits the audio media on frame
boundaries and fills any gaps with silence. The
following illustration shows the resulting audio
regions that are exported to Avid.
When you use Export Selected Tracks as
OMF/AFF to export tracks from Pro Tools with
Enforce Avid Compatibility enabled, a number
of additional media files labeled Sample Accu-
rate Edit appear in the Avid bins. These are the
additional media files that Pro Tools creates to
ensure that the Avid editing application receives
frame-accurate audio. You also see the sample-
accurate edit media files if you zoom in on the
imported audio in the Timeline.
Figure 1. Original audio region
One Pro Tools audio region
5 frame video clip
The original audio region does not line up on video frame boundaries
Figure 2. Exported audio region
Three exported audio regions
5 frame video clip
Exported audio regions line up on video frame boundaries
New audio region
with padded silence
New audio region
with padded silence