Choose a multiplier below 1x to slow a video down or above 1x to speed it up; the new duration equals the original duration divided by that multiplier. A 20-second clip becomes about 10 seconds at 2x or 40 seconds at 0.5x.
Change video playback speed
Choose 0.5x, 0.75x, 1.25x, 1.5x or 2x and download the adjusted clip.
What speed multipliers mean
The multiplier describes how quickly the timeline runs compared with normal speed. At 1.5x, every second of output covers one and a half seconds of the source. At 0.75x, the output runs more slowly and becomes longer.
Speed changes affect motion and synchronized audio. Faster speech can become hard to follow; slower speech can sound unnaturally low or stretched depending on processing.
Slow motion looks best when the source contains enough frames. Slowing a low-frame-rate clip reveals larger jumps between captured moments because the tool cannot recreate every missing instant.
How to change video speed with Mediaivo
- Decide the purpose
Choose whether you need a shorter explanation, a faster timelapse feel or a slower view of an action.
- Select a multiplier
Use a modest value such as 1.25x or 0.75x first when natural motion matters.
- Process the clip
Mediaivo adjusts the video timeline and keeps audio synchronized when an audio track is present.
- Review the hardest section
Check fast movement and complete spoken sentences before accepting the result.
Choose a speed for the job
Use the smallest adjustment that achieves the timing goal.
| Situation | Recommended choice | Check before publishing |
|---|---|---|
| Long tutorial or screen recording | 1.25x to 1.5x | Make sure speech and cursor actions remain understandable. |
| Timelapse-style summary | 1.5x to 2x | Watch for motion that becomes too abrupt or disorienting. |
| Demonstration needing more detail | 0.5x to 0.75x | Check for choppy motion and stretched audio. |
How to calculate the new duration
Divide the original duration by the speed multiplier. A 60-second video at 1.5x becomes about 40 seconds. The same 60-second video at 0.5x becomes about 120 seconds.
Treat the calculation as a planning estimate and check the actual output, especially when the source contains unusual timing or variable frame-rate material.
Common mistakes to avoid
1. Using 2x for speech without listening
The shorter duration may not help if viewers cannot understand the words.
2. Expecting smooth slow motion from every source
Low-frame-rate footage has fewer captured moments to spread across the longer timeline.
3. Forgetting the output duration
Slowing video can create a much larger and longer file than expected.
4. Judging only silent playback
Audio quality and synchronization are central to most speed-adjusted clips.
Final check before downloading or publishing
- The new duration matches the plan.
- Speech remains understandable.
- Motion does not feel uncomfortably jerky.
- Audio stays synchronized from start to finish.
- The speed change serves a clear viewing purpose.
Frequently asked questions
What does 0.5x speed mean?
The video runs at half normal speed and lasts approximately twice as long.
What does 2x speed do to duration?
It runs twice as fast and reduces the duration to approximately half.
Why is slow motion choppy?
The source may not contain enough frames per second to create smooth motion at the slower speed.
Will the audio stay synchronized?
Mediaivo adjusts the audio timeline with the video when audio is present, but you should test the full output.
Set the pace your audience needs
Choose a multiplier, predict the duration and review both motion and sound.