Browser FFmpeg recipe
Change Video Speed Online with FFmpeg
Create a 2x speed video with matching faster audio.
Command
Run this FFmpeg command
ffmpeg -i input.mp4 -filter:v setpts=0.5*PTS -filter:a atempo=2.0 faster.mp4When to use it
- timelapse previews
- fast tutorials
- shorter demos
How it works
- Upload the video.
- Adjust setpts and atempo values for the speed you want.
- Run FFmpeg and download the speed-adjusted video.
Option reference
| Option | What it does |
|---|---|
setpts=0.5*PTS | Makes video play at 2x speed. |
atempo=2.0 | Makes audio play at 2x speed. |
Practical notes
- For half speed, use setpts=2.0*PTS and atempo=0.5.
- Audio tempo values outside the supported range may need chained filters.
FAQ
How do I make a video slower?
Use a larger setpts value, such as 2.0*PTS, and a matching lower audio tempo.
Can I change video speed without audio?
Yes. Remove the audio filter and add -an if you want a silent output.