#!/bin/bash

# check if ffmpeg seems to be capable of tasks ahead
ffmpeg -filters 2>/dev/null | grep -q 'silencedetect' || { echo "your ffmpeg can't silencedetect" ; exit; }

# var
limit="-90dB"
searchdur="5"
silencedur="0.1"

# loop
while [ $# -gt 0 ]; do

    file="$1" && echo "---" && echo "$file"

    # from start
    ffmpeg -to "${searchdur}" -i "${file}" -af silencedetect=n="${limit}":d="${silencedur}" -f null 2>&1 - | grep silencedetect || echo "no silence at start"
    echo
    # from end
    ffmpeg -sseof -"${searchdur}" -i "${file}" -af silencedetect=n="${limit}":d="${silencedur}" -f null 2>&1 - | grep silencedetect || echo "no silence at the end"
    
    shift
done