In Envizion AI, select a clip and open the Speed panel to set any rate from 0.25x slow motion to 16x fast-forward. Use optical flow for smooth slow motion or speed ramps for dynamic acceleration within a single clip.
# How Do I Speed Up or Slow Down Video?
Controlling playback speed is a powerful storytelling tool. Slow motion adds drama to action shots, fast-forward condenses long processes into seconds, and speed ramps create dynamic transitions. Envizion AI gives you precise speed controls with frame interpolation for buttery-smooth results.
1. Select a clip on the timeline.
2. Open the Speed panel — Right-click the clip and select "Speed" or press Ctrl+Shift+S.
3. Set the speed multiplier — Drag the slider or type a value. Options range from 0.25x (quarter speed) to 16x.
4. Choose the method:
- Frame blending — Blends adjacent frames for smooth slow motion. Best for standard footage.
- Optical flow — AI generates intermediate frames for ultra-smooth slow motion. Best for 60fps or higher source footage.
- Frame skip — Simply drops frames for speed-up. Fastest to process.
5. Preview and export — Play back to verify the speed feels right, then export.
A speed ramp gradually accelerates or decelerates within a single clip. For example, start at normal speed, ramp to 2x during a transition, then return to normal.
To create a speed ramp:
1. Right-click the clip and select Speed Ramp.
2. Add keyframe points on the speed curve.
3. Drag points up (faster) or down (slower).
4. The curve auto-smooths for natural acceleration.
When you change speed, audio pitch changes by default. Enable Pitch Correction to maintain natural-sounding voice even at altered speeds. This is essential for talking-head speed-ups.
Yes, but results are best when the source is 60fps or higher. Envizion AI's optical flow interpolation creates new frames, but more source frames mean smoother output.
Yes. Use the split tool to isolate the section you want to speed up, then change the speed of just that segment. Or use speed ramps for seamless transitions.
With pitch correction enabled, voice remains natural up to about 2x speed. Beyond that, some artifacts may appear. For extreme speed-ups, consider muting the original audio and adding music.
Combine speed effects with Envizion AI's 35 animation presets and 42 overlay types for content that feels cinematic and professional.
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