Convert input audio to a video output, representing the samples waves.

The filter accepts the following named parameters:

n

Set the number of samples which are printed on the same column. A larger value will decrease the frame rate. Must be a positive integer. This option can be set only if the value for rate is not explicitly specified.

rate, r

Set the (approximate) output frame rate. This is done by setting the option n. Default value is "25".

size, s

Specify the video size for the output. Default value is "600x240".

Some examples follow.

• Output the input file audio and the corresponding video representation at the same time:

  amovie=a.mp3,asplit[out0],showwaves[out1]

• Create a synthetic signal and show it with showwaves, forcing a framerate of 30 frames per second:

  aevalsrc=sin(1*2*PI*t)*sin(880*2*PI*t):cos(2*PI*200*t),asplit[out0],showwaves=r=30[out1]