FFmpeg 3.4.13
Since* 2.8
#

Convert input audio to video output representing the audio power spectrum. Audio amplitude is on Y-axis while frequency is on X-axis.

The filter accepts the following options:

size, s

Specify size of video. For the syntax of this option, check the "Video size" section in the ffmpeg-utils manual. Default is 1024x512.

mode

Set display mode. This set how each frequency bin will be represented.

It accepts the following values:

  • line
  • bar
  • dot

Default is bar.

ascale

Set amplitude scale.

It accepts the following values:

lin

Linear scale.

sqrt

Square root scale.

cbrt

Cubic root scale.

log

Logarithmic scale.

Default is log.

fscale

Set frequency scale.

It accepts the following values:

lin

Linear scale.

log

Logarithmic scale.

rlog

Reverse logarithmic scale.

Default is lin.

win_size

Set window size.

It accepts the following values:

  • w16
  • w32
  • w64
  • w128
  • w256
  • w512
  • w1024
  • w2048
  • w4096
  • w8192
  • w16384
  • w32768
  • w65536

Default is w2048

win_func

Set windowing function.

It accepts the following values:

  • rect
  • bartlett
  • hanning
  • hamming
  • blackman
  • welch
  • flattop
  • bharris
  • bnuttall
  • bhann
  • sine
  • nuttall
  • lanczos
  • gauss
  • tukey
  • dolph
  • cauchy
  • parzen
  • poisson

Default is hanning.

overlap

Set window overlap. In range [0, 1]. Default is 1, which means optimal overlap for selected window function will be picked.

averaging

Set time averaging. Setting this to 0 will display current maximal peaks. Default is 1, which means time averaging is disabled.

colors

Specify list of colors separated by space or by ’|’ which will be used to draw channel frequencies. Unrecognized or missing colors will be replaced by white color.

cmode

Set channel display mode.

It accepts the following values:

  • combined
  • separate

Default is combined.

minamp

Set minimum amplitude used in log amplitude scaler.