Script to run FFMPEG overlay audio-viz to picture.

audioviz_overlay.sh

#! /bin/sh
ifn="[slug_name]"
pref="`basename $0 .sh`"

fpathaudio="in/${ifn}.mp3"
fpathpic="in/${ifn}.jpg"

# RUN FFMPEG SCRIPT
./ffmpeg -y -i "${fpathaudio}" -i "${fpathpic}" -filter_complex "
[0:a]showwaves=s=640x150:mode=cline:colors=red,colorkey=0x000000:0.01:0.1,format=yuva420p[v];
[1:v]scale=1280:720[bg];
[bg][v]overlay=(W-w)/2:500[outv]
" -map "[outv]" -map "0:a" -threads 0 -c:v libx264 -pix_fmt yuv420p -b:a 360k -r:a 44100 -c:a copy -shortest "out/${pref}_${ifn}.mp4"