FFmpeg 1.0.10
Since* 1.0
#

Adjust audio tempo.

The filter accepts exactly one parameter, the audio tempo. If not specified then the filter will assume nominal 1.0 tempo. Tempo must be in the [0.5, 2.0] range.

For example, to slow down audio to 80% tempo:

atempo=0.8

For example, to speed up audio to 125% tempo:

atempo=1.25