DigiDesign Pro Tools, Справочное руководство

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Chapter 35: Working with Synchronization 805
Video Frame Rate Pull Up and
Down
The Video Pull Up/Down selector lets you
change the frame rate of QuickTime movie play-
back independently from the audio pull-
up/down rate. The selector is located below the
Audio Rate Pull Up/Down menu in the Session
Setup window.
The choices available in the Video Rate Pull
Up/Down menu depend on the file format and
frame rate of the QuickTime movie. Video pull
rates are saved with the session.
Effect of Using Pull Up or Pull Down
The following sections describe how related
Pro Tools features are affected by pull up and
down rates.
Time Code Ruler
Video pull up and down does not affect the Time
Code ruler. Be sure to set the session Frame Rate
to the correct frame rate for your project. For ex-
ample, if working with 24 fps video and you pull
the video up by 4%, switch the session Frame
Rate to 25 fps to keep the Time Code ruler
aligned. Similarly, if working with 24 fps video
that is pulled down by 0.1%, switch the frame
rate of the session to 29.97.
When working with 25 fps Avid media and the
video is set to pull down by 4%, set the session
Frame Rate to 24 fps.
Plug-ins
For proper operation at larger (4%) pull rates,
plug-ins must utilize sample clock instead of an
absolute time clock. All Digidesign plug-ins are
based on sample clock.
Higher Sample Rates and Pull Factors
4% audio pull rates are not available in 176.4
and 192 kHz sample rate sessions.
No Video Recording with Pull Ups
(Avid Video Peripheral Required)
Video may not be recorded to the timeline if a
video pull up is selected. If the video track is
record-enabled while video pull ups are enabled,
or if you attempt to set a video pull up rate while
the video track is record-enabled, Pro Tools will
post a dialog and disallow video recording. To
proceed with digitization, reset the Video Rate
Pull Up menu to None.
Putting Pro Tools Online
To trigger playback or recording from an exter-
nal source, the Pro Tools Transport must be
placed
online . This tells Pro Tools to listen for in-
coming time code.
To put the Pro Tools Transport online, do one of the
following:
■
Choose Options > Transport Online.
■
Click the Online button at the far left of the
Transport.
■
Press J (Windows) or J
(Mac).
Video Rate Pull Up/Down menu in Session Setup
See also “Auto Match Pull Factors” on
page 803.