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.

'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'

'bohman'

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.