reencode.sh

   1 #!/usr/bin/env bash
   2 # shellcheck disable=SC1004
   3 # shellcheck disable=SC2016
   4 # shellcheck disable=SC2126
   5 set -eux
   6 test $# -gt 0 ||
   7 set -- "${0%/*}"/{old,new}/audio
   8 #preserveCoverArt="-vcodec copy -f mkv"
   9 find "$@" -depth -type f \( -name "*.mp3" -o -name "*.m4a" -o -name "*.audio*" -o -name "*.unknown_video" \) -print0 | sort -n -z |
  10 xargs -0 -P "$(lscpu --online -p | grep -v "#" | wc -l)" -I {} bash -c '
  11   nice -n 19 ffmpeg -y -i "$0" \
  12     -map_metadata 0:s:a:0 \
  13     -c:a libopus -b:a 32k \
  14     -application voip "${0%.*}.opus" &&
  15   rm -vf "$0"
  16 ' {} \;
  17
  18 # -map_metadata 0:s:a:0
  19 # copies metadata from the first input file (0:),
  20 # first audio stream (s:a:0) to all output files.