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APPENDIX A
338
Measuring Time and Frame Size
•
When motion in a Timeline clip appears to stutter during playback, increasing the Video
Settings or Export Settings frame rate may not automatically improve the motion in the source
clip, because all of the clip’s frames available in the Timeline are already included (unless
you reduced the clip’s frame rate using Frame Hold). However, you may be able to simulate
smoother motion by applying
frame blending
to the clip. When a clip has a lower frame rate
than the Timeline and you apply frame blending, Premiere creates enough intermediate
frames to create smoother motion. The new frames Premiere creates are interpolated between
the clip’s frames that are currently available in the Timeline.
•
When working with audio, it can be useful to start playing from a point in the source audio
clip that is between frames—not accessible at the time divisions provided by the timebase. You
can use the Frame/Samples time display to work with those frames or audio samples. For more
information, see “Counting frames and samples” on page 340.
For information on applying the Interpret Footage, Speed, and Frame Hold commands and
the frame blending option, see “Changing the frame rate of a clip” on page 160.
If you are preparing a program for media that use different frame rates, such as both television
and Web delivery, you can save a different set of project or export settings for each medium.
For information about setting the project frame rate and saving project and export settings,
see “Video settings” on page 61, “Saving and loading project settings” on page 66, and
“Exporting video files” on page 304.
Duration
Each project and video clip has its own
duration
, which describes how long the item plays.
Before you edit a clip, its duration is its original length. After you edit a clip, its duration is
determined by the In and Out points you set for it. See “Changing clip duration and speed”
on page 157 and “Editing a clip that exists between other Timeline clips” on page 176.
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