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, 100.0] range.
Note that tempo greater than 2 will skip some samples rather than blend them in. If for any reason this is a concern it is always possible to daisy-chain several instances of atempo to achieve the desired product tempo.
Examples
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Slow down audio to 80% tempo:
atempo=0.8
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To speed up audio to 300% tempo:
atempo=3
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To speed up audio to 300% tempo by daisy-chaining two atempo instances:
atempo=sqrt(3),atempo=sqrt(3)
Commands
This filter supports the following commands:
- tempo
-
Change filter tempo scale factor. Syntax for the command is : "tempo"