showfreqs

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 (ffmpeg-utils)"Video size" section in the ffmpeg-utils manual. Default is 1024x512.

rate, r

Set video rate. Default is 25.

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. Allowed range is from 16 to 65536.

Default is 2048

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’

‘bohman’

‘kaiser’

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.

data

Set data display mode.

It accepts the following values:

‘magnitude’

‘phase’

‘delay’

Default is magnitude.

channels

Set channels to use when processing audio. By default all are processed.