Detect silence in audio files

output-silences.bash

#!/usr/bin/env bash
set -e


audio_filename="${1}"
silence_length="${2}"

ffmpeg -i "${audio_filename}" -af "silencedetect=d=${silence_length}" -f null - |& awk '/silence_end/ {print $4,$5}' | awk '{S=$2;printf "%d:%02d:%02d\n",S/(60*60),S%(60*60)/60,S%60}'