Detect silence in an audio stream.

This filter logs a message when it detects that the input audio volume is less or equal to a noise tolerance value for a duration greater or equal to the minimum detected noise duration.

The printed times and duration are expressed in seconds.

duration, d

Set silence duration until notification (default is 2 seconds).

noise, n

Set noise tolerance. Can be specified in dB (in case "dB" is appended to the specified value) or amplitude ratio. Default is -60dB, or 0.001.

Detect 5 seconds of silence with -50dB noise tolerance:

silencedetect=n=-50dB:d=5

Complete example with ffmpeg to detect silence with 0.0001 noise tolerance in silence.mp3:

ffmpeg -f lavfi -i amovie=silence.mp3,silencedetect=noise=0.0001 -f null -