```bash ffmpeg \ -i $INPUT \ -filter_complex "[0:a]pan=mono|c0=0.5*FL+0.5*FR,asplit=2[aout][audiovis]; \ [audiovis]showwaves=s=1920x1080:mode=p2p:colors=white,format=yuv420p[v]" \ -map "[v]" -map "[aout]" -c:v libx264 -crf 36 -c:a libaac -b:a 64k -ac 1 output.mp4 ```