ffmpeg -i input -filter_complex "[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]" -map "[v]" -map 0:a -c:v libx264 -c:a copy output.mkv
ffmpeg -i input -filter_complex "showwavespic=s=640x120" -frames:v 1 output.png

via https://www.quora.com/How-can-I-generate-a-visual-waveform-representation-of-the-audio-from-a-YouTube-video/answer/Matt-Durr
via https://jeekajoo.eu/links/?mhmzug
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