#!/bin/bash
cd /srv/recording

find -name "*.flac" -mmin +1 | while read f; do
  if ! test -e silence/"$f".txt; then
    echo "$f"
    nice -n19 ffmpeg -hide_banner  -i $f -af silencedetect=duration=30 -f null - 2>&1 </dev/null | sed 's/\r/\n/g' >silence/"$f".txt
  fi
done