FFmpeg 2.1.8
Since* 2.0
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Generate an audio signal made of a sine wave with amplitude 1/8.

The audio signal is bit-exact.

The filter accepts the following options:

frequency, f

Set the carrier frequency. Default is 440 Hz.

beep_factor, b

Enable a periodic beep every second with frequency beep_factor times the carrier frequency. Default is 0, meaning the beep is disabled.

sample_rate, r

Specify the sample rate, default is 44100.

duration, d

Specify the duration of the generated audio stream.

samples_per_frame

Set the number of samples per output frame, default is 1024.

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Examples

  • Generate a simple 440 Hz sine wave:

    sine
    
  • Generate a 220 Hz sine wave with a 880 Hz beep each second, for 5 seconds:

    sine=220:4:d=5
    sine=f=220:b=4:d=5
    sine=frequency=220:beep_factor=4:duration=5