#!/usr/bin/env bash

if [ ! -x $(which ffmpeg) ]; then
  echo "Error: ffmpeg not (correctly) installed" > /dev/stderr
  exit 1
fi

for t in 15 30 45 60 75 90 105 120; do
  ffmpeg -ar 48000 \
    -t ${t} \
    -f s16le \
    -acodec pcm_s16le \
    -ac 2 \
    -i /dev/zero \
    -acodec libmp3lame \
    -aq 4 \
    silence_${t}.mp3 \
    && file silence_${t}.mp3
done