User Manual

Mixing Frame Rates and Field Motion Types

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Mixed rate clips always play at the project’s frame rate, both in Source or pop-up monitors and in

sequences. Audio remains synchronized with video. You can stack clips with different frame

rates or field motion types on multiple video tracks, apply effects, and otherwise perform all

normal editing operations.

How Your Avid Editing Application Handles Mixed Rate Clips

Motion Adapter Effects

Your Avid editing application uses Motion Adapter effects to handle:

• Clips that have a different frame rate from the project’s frame rate

• Clips with field motion that need adjustment to be compatible with the project

• Clips with 2:3 pulldown or strobe frames

Motion Adapter effects allow mixed rate clips to play at the project’s frame rate and to have the

correct field motion.

Motion Adapter effects are different from other effects in several ways:

• You do not apply Motion Adapter effects manually. The Motion Adapter effect does not

appear in the Effect Palette and does not have an effect icon. Your Avid editing application

applies Motion Adapter effects and sets their parameter values automatically.

• Your Avid editing application applies Motion Adapter effects when they load into a Source

or pop-up monitor for viewing and playing as well as when they are edited into a sequence.

If you load a traditional (source-side) motion effect that has a different frame rate from the

project’s frame rate, it is automatically promoted. In the case of Strobe Motion effects, the update

rate of the strobe motion is adjusted so that the effect maintains the same look at the project’s

frame rate.

• You cannot remove a Motion Adapter effect that adjusts the speed of a clip with the Remove

Effect button. If you promote a Motion Adapter effect to a Timewarp effect and then use the

Remove Effect button to remove the Timewarp, your Avid editing application re-applies a

Motion Adapter effect.

• You often do not need to adjust Motion Adapter effects. Most of the time, they work

automatically and seamlessly to allow mixed rate clips to play correctly in a project. For

information on when you might want to adjust a Motion Adapter effect and on how to do so,

see “Viewing and Adjusting Motion Adapter Parameters” on page 590.

You might need to provide accurate frame layout information for a clip, such as its field motion

or whether it contains pulldown. For information on how to do this, and more details of the

circumstances that might require it, see “Modifying the Field Motion Attribute for a Clip” on

page 592.