Does anyone know if you can key frame opacity within a video track?
The only way I know how to do this is to duplicate the track and set the top track to the opacity I want. Then use a a dissolve between the two, making it "appear" like I did key framing.
Right-click in the Track header area and select Insert/Remove Envelope - Composite Level.
This can be keyframed just like an audio envelope.
Make sure it'sback to 100% for the event that follows.