Convert stereo input audio to a video output, representing the spatial relationship between two channels.

The filter accepts the following options:

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 512x512.

win_size

Set window size. Allowed range is from 1024 to 65536. Default size is 4096.

win_func

Set window function.

It accepts the following values:

• rect
• bartlett
• hann
• hanning
• hamming
• blackman
• welch
• flattop
• bharris
• bnuttall
• bhann
• sine
• nuttall
• lanczos
• gauss
• tukey
• dolph
• cauchy
• parzen
• poisson
• bohman

Default value is hann.

overlap

Set ratio of overlap window. Default value is 0.5. When value is 1 overlap is set to recommended size for specific window function currently used.