In the latest part of my editing, I noticed that the lip-syncing wasn't 100% accurate, thus I decided to use a speed ramp to speed up or slow down footage over the course of the playback.
where I've dramatically slowed down a portion of the footage, the shot would begin to appear choppy (like stop-motion animation). I reduced this by using an algorithm called Optical Flow, just by using the Retiming menu to select Video Quality > Optical Flow.
This video demonstrates the use of a speed ramp, as opposed to changing the motion of a whole clip. I find this to be one of the best ways of changing motion speeds, particularly when lip-syncing. When frames are concerned (in my case I shot at 50fps), When slowing this down by 50% for example, you lose a slight bit of framing, leaving the footage with 24.8fps instead of 25.
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