Does slow motion work on any video?

Yes, but 60fps or higher source footage produces the smoothest results. Optical flow interpolation creates intermediate frames for lower frame rates.

Can I speed up only part of a clip?

Yes. Split the clip to isolate the section, then change speed on that segment. Or use speed ramps for seamless transitions.

Does changing speed affect audio quality?

With pitch correction enabled, voice stays natural up to about 2x. For extreme speed-ups, consider replacing audio with music.

What is the best speed for time-lapse videos?

For time-lapse videos, a speed multiplier between 4x and 16x works best. This range effectively condenses long processes like sunrise/sunset or drawing sessions into a few seconds. Envizion AI offers precise speed controls, allowing you to choose the exact multiplier that suits your footage. Use the frame skip method for faster processing times.

How do I maintain audio quality when speeding up a video?

Enable pitch correction to maintain natural-sounding audio when speeding up a video. This feature is crucial for talking-head content and ensures that the voice remains natural up to about 2x speed. Beyond that, some artifacts may appear, so consider muting the original audio and adding background music for extreme speed-ups.

Can I create smooth slow motion with any video?

Smooth slow motion works best with source footage that is 60fps or higher. Envizion AI's optical flow interpolation creates new frames for ultra-smooth slow motion, but having more source frames ensures better results. For standard footage, frame blending is a good alternative for achieving smooth slow motion.

What are speed ramps and how do I use them?

Speed ramps gradually accelerate or decelerate within a single clip. To create a speed ramp, right-click the clip and select 'Speed Ramp,' then add keyframe points on the speed curve. Drag points up for faster motion or down for slower motion. The curve auto-smooths for natural acceleration, creating dynamic transitions in your video.

What is the difference between frame blending and optical flow?

Frame blending combines adjacent frames for smooth slow motion and is best for standard footage. Optical flow, on the other hand, uses AI to generate intermediate frames, resulting in ultra-smooth slow motion. Optical flow is ideal for source footage that is 60fps or higher, providing more detailed and fluid motion.

faq_individual

How Do I Speed Up or Slow Down Video?

March 16, 2026faq_individual

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.

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# 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.

How to Change Video Speed

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.

Speed Ramps

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.

Use Cases

Slow motion (0.25x-0.5x) — Sports highlights, product reveals, dramatic moments.
Slight speed-up (1.25x-1.5x) — Tighten talking-head content without noticeable pitch change.
Time-lapse effect (4x-16x) — Condense setup processes, sunrise/sunset, or drawing sessions.

Audio Behavior

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.

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