Video Speed
video-speed
Adjusts the playback speed of a video by a given multiplier.
video-speed accepts a float value between 0.25 and 2.0, where 1.0 is normal playback speed. Values below 1.0 slow the video down, and values above 1.0 speed it up.
Audio pitch is automatically corrected at all speeds, so voices and music remain natural regardless of the multiplier.
Slow Motion
When video-speed is set below 1.0, frame interpolation is applied automatically to maintain smooth playback. For example, video-speed=0.5 on a 30fps source will generate interpolated frames to preserve 30fps output rather than producing a choppy 15fps result. To disable this behavior, set video-interpolation=false.
Accepted Values
| Value | Effect |
|---|---|
0.25 | Quarter speed (4× slow motion) |
0.5 | Half speed (2× slow motion) |
1.0 | Normal speed (default) |
2.0 | Double speed (2× fast motion) |