[Punchline]

Originally Posted by deadworkersparty

Right click on video clip in your timeline and select "Insert/Remove Envelope" then select "Velocity". A green envelope will appear. You can then add points and drag up and down to vary your clip's speed.

Holding Shift will let you "paint" the envelope, and double-clicking the line will add points. Right-click the line to see more options.

Thank you!!