Hello,
I'd like to overlay the audio waveform coming from an axis camera's stream. 
I've started to read the documentation, but It's quiet complex.  For testing
I use that bunny stream. 
So far I managed to pad a bottom:
#! /bin/bash
stream="rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov"
padbottom=40
ffmpeg -i "$stream" -vf
"pad=width=240:height=160+$padbottom:x=0:y=0:color=black" outfile.mp4
I'd like similar to this video:
https://www.youtube.com/watch?v=BG9SYC0wWYw
Could you please help me? 
Thanks,
Zolee