preserveNestedFrameRate

When true, the frame rate of nested compositions is preserved in the current composition. Corresponds to the value of the Preserve frame rate when nested or

frameDuration

Returns the lengthof a frame for this AVItem, in seconds. This is the reciprocal of frameRate. When set, the reciprocal is automatically set as a new frameR

replaceWithPlaceholder()

Changes the source of this FootageItem to the specified placeholder. Creates a new PlaceholderSource object, sets its values from the parameters, and sets m