FFmpeg 4.4.5
Since* 4.4
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Apply phase shift to input audio samples.

The filter accepts the following options:

shift

Specify phase shift. Allowed range is from -1.0 to 1.0. Default value is 0.0.

level

Set output gain applied to final output. Allowed range is from 0.0 to 1.0. Default value is 1.0.

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Commands

This filter supports the all above options as commands.