CONVERSION LOGIC
Change video playback speed
Adjust video timestamps and audio tempo together for speeds from 0.5× to 2×.
Media fileProcessed mediaRuns locally
01Media file
02setpts 1/speed + atempo speed
03Processed media
2× halves the approximate duration; 0.5× doubles it.
Video and audio need different timing filters
FFmpeg changes video presentation timestamps with setpts while audio uses the atempo filter.
Your content stays in the browser
Processing runs locally in the page without requiring the content to be sent to UtilityLake.
02
In short
What exactly does it do?
Adjust video timestamps and audio tempo together for speeds from 0.5× to 2×.
Example?
2× halves the approximate duration; 0.5× doubles it.