Replace a transition – Adobe Premiere Pro CC v.7.xx User Manual
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If you paste a transition without selecting edit points, the transitions are pasted to edit points at or near the playhead, without overriding track
targeting.
If a selected edit point already has a transition, and:
if the pasted transition is different from the existing one, then the transition type changes but preserves the existing transition's duration
and alignment. For example, pasting a Cross Dissolve transition over a Barn Door transition.
if the pasted transition is the same as the existing transition, then the duration and alignment are changed. For example, both are Cross
Dissolve transitions.
A copied transition's alignment is preserved if it's set to one of the presets, but not if it has a custom setting.
Replace a transition
Drag the new video or audio transition from the Effects panel onto the existing transition in the sequence.
When you replace a transition, the alignment and duration are preserved. However, this discards the settings for the old transition and
replaces it with the default settings for the new transition.
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