Audio Tempo
Change the speed of an audio clip from 0.5x to 2x with the PITCH PRESERVED (ffmpeg atempo), so a voice line gets faster or slower without turning into a chipmunk. Two modes: Factor (a speed, >1 is faster and shorter) or Target seconds (time-stretch the clip to land on an exact length, for fitting a re-voiced line onto an existing lip-sync take). Speed 1 (or blank) hands the input through untouched. A speed or fit outside 0.5x to 2x is refused with the numbers, never clamped. Outputs the audio and its measured duration. Free: deterministic processing, the output url is content-addressed, so an unchanged re-run reuses the last file.
Audio Tempo
Node type: utility:audio_tempo
Category: Editing
Description
Change the speed of an audio clip from 0.5x to 2x with the PITCH PRESERVED (ffmpeg atempo), so a voice line gets faster or slower without turning into a chipmunk. Two modes: Factor (a speed, >1 is faster and shorter) or Target seconds (time-stretch the clip to land on an exact length, for fitting a re-voiced line onto an existing lip-sync take). Speed 1 (or blank) hands the input through untouched. A speed or fit outside 0.5x to 2x is refused with the numbers, never clamped. Outputs the audio and its measured duration. Free: deterministic processing, the output url is content-addressed, so an unchanged re-run reuses the last file.
Canvas ports
These appear as port handles on the left side of the node.
| ID | Label | Details |
|---|---|---|
audio |
Audio | AUDIO (required) |
Sidebar config
These render as form fields in the right-side config panel when the node is selected.
| ID | Label | Details |
|---|---|---|
mode |
Mode | TEXT · options: factor, target_seconds |
speed |
Speed (0.5 to 2; blank = 1x) | NUMBER |
targetSeconds |
Target seconds (Target mode) | NUMBER |
format |
Format | TEXT · options: mp3, wav |
Outputs
| ID | Label | Type |
|---|---|---|
audio |
Audio | AUDIO |
duration |
Duration (s) | NUMBER |
What it is for
A voice line runs 0.4 seconds long for the shot. Speed it up to 1.1x and it fits,
with the pitch unchanged. ffmpeg's atempo retimes without resampling the
voice up, so it sounds faster, not higher.
Re-voicing a reel with a new voice clone? Each new phrase comes out a little longer or shorter than the lip-sync take it has to land on. Set Mode to Target seconds, type the take's length, and the node measures the phrase and picks the speed for you (source length / target).
Settings
- Mode: Factor (default) reads Speed. Target seconds reads Target seconds and ignores Speed.
- Speed is 0.5 to 2, >1 is faster and shorter. Blank or 1 hands the input through untouched (no transcode).
- Target seconds (Target mode): the length to land on. The speed it needs must also be 0.5 to 2, so a 2.2s phrase fits anywhere from 1.1s to 4.4s. The source is measured from the file (wav, mp3 and m4a); an unreadable one is refused, not guessed.
- Format is mp3 (default) or wav. Sample rate and channels are kept from the source.
Anything outside the range is refused with the numbers, never clamped.
Outputs
Audio is the retimed clip. Duration is its measured length in seconds, read from the output file, so you can wire it into anything that needs the real number.
Free, and why
The node is in the free set: it re-runs whenever something downstream runs, and it has no Run button. The output file is named by a hash of the input url and the settings, so an unchanged re-run reuses the last file and invokes nothing. Change the speed and it makes a new file.
Auto-generated from the Wireflow node registry.