Trim silence from cli

Trim all silence (0.5 seconds or longer)

sox in.wav out.wav silence -l 1 0.1 1% -1 0.5 1%

https://digitalcardboard.com/blog/2009/08/25/the-sox-of-silence/comment-page-2/

Noise and dynamics reduction

ffmpeg -i out.wav -af anlmdn=s=0.01,loudnorm=I=-8:LRA=5 -ar 48k out2.wav -y

https://superuser.com/questions/733061/reduce-background-noise-and-optimize-the-speech-from-an-audio-clip-using-ffmpeg

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