Speed changes, freeze frames, and optical flow

Retiming changes how source time maps to timeline time. Simple frame sampling, frame blending, and optical-flow interpolation produce different artifacts. The right method depends on movement and available frames.

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Work through it

1. Duplicate a short shot and use Change Clip Speed or Retime Controls to create a constant-speed slow version. Check its duration and how the change affects adjacent clips.
2. Add speed points to build a ramp. Open retime curves and adjust the speed transition so acceleration supports the action rather than feeling accidental.
3. Compare the available retime-process settings on a difficult section. Inspect occlusion edges, crossing limbs, water, and fast pans, where invented frames may fail.
4. Create a brief freeze frame deliberately and add enough context before and after it. Render a short test; real-time preview can skip frames and hide interpolation defects.

Your turn

Create a slow section, a speed ramp, and a freeze using one clip. Export each and identify the cleanest method for the source material.

Your notes

Write down what worked, what surprised you, and what to try next. Saved on this device.

Original practical lesson · Open the in-house resource shelf for practice files and definitions. Completion records your self-assessment, not certification.