ahistogram

Convert input audio to a video output, displaying the volume histogram.

The filter accepts the following options:

'dmode'

Specify how histogram is calculated.

It accepts the following values:

'single'

Use single histogram for all channels.

'separate'

Use separate histogram for each channel.

Default is single.

'rate, r'

Set frame rate, expressed as number of frames per second. Default value is "25".

'size, s'

Specify the video size for the output. For the syntax of this option, check the (ffmpeg-utils)"Video size" section in the ffmpeg-utils manual. Default value is hd720.

'scale'

Set display scale.

It accepts the following values:

'log'

logarithmic

'sqrt'

square root

'cbrt'

cubic root

'lin'

linear

'rlog'

reverse logarithmic

Default is log.

'ascale'

Set amplitude scale.

It accepts the following values:

'log'

logarithmic

'lin'

linear

Default is log.

'acount'

Set how much frames to accumulate in histogram. Default is 1. Setting this to -1 accumulates all frames.

'rheight'

Set histogram ratio of window height.

'slide'

Set sonogram sliding.

It accepts the following values:

'replace'

replace old rows with new ones.

'scroll'

scroll from top to bottom.

Default is replace.