Convert input audio to a video output, displaying the audio bit scope.

The filter accepts the following options:

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 "Video size" section in the ffmpeg-utils manual. Default value is 1024x256.

colors

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