ffmpeg -i voice.mp3 -i test.mp4 -filter_complex "[0:a]showwaves=s=1280x720:mode=line,colorkey=0x000000:0.01:0.1,format=yuva420p[v];[1:v]scale=1280:720[bg];[bg][v]overlay[outv]" -map "[outv]" -map 0:a -c:v libx264 -c:a copy -shortest output.mkv
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