showvolume

Convert input audio volume to a video output.

The filter accepts the following options:

'rate, r'

Set video rate.

'b'

Set border width, allowed range is [0, 5]. Default is 1.

'w'

Set channel width, allowed range is [80, 8192]. Default is 400.

'h'

Set channel height, allowed range is [1, 900]. Default is 20.

'f'

Set fade, allowed range is [0, 1]. Default is 0.95.

'c'

Set volume color expression.

The expression can use the following variables:

'VOLUME'

Current max volume of channel in dB.

'PEAK'

Current peak.

'CHANNEL'

Current channel number, starting from 0.

't'

If set, displays channel names. Default is enabled.

'v'

If set, displays volume values. Default is enabled.

'o'

Set orientation, can be horizontal: h or vertical: v, default is h.

's'

Set step size, allowed range is [0, 5]. Default is 0, which means step is disabled.

'p'

Set background opacity, allowed range is [0, 1]. Default is 0.

'm'

Set metering mode, can be peak: p or rms: r, default is p.

'ds'

Set display scale, can be linear: lin or log: log, default is lin.

'dm'

In second. If set to > 0., display a line for the max level in the previous seconds. default is disabled: 0.

'dmc'

The color of the max line. Use when dm option is set to > 0. default is: orange