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.
The filter accepts the following options:
- 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.
Examples
-
Detect 5 seconds of silence with -50dB noise tolerance:
silencedetect=n=-50dB:d=5
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Complete example with ffmpeg to detect silence with 0.0001 noise tolerance in silence.mp3:
ffmpeg -i silence.mp3 -af silencedetect=noise=0.0001 -f null -