A script to resample your FLAC files *and* make sure they conform to the FLAC Subset specification so they will play in pretty much all hardware players - e.g. portable music players like those made by COWON) - all this while minimizing the file sizes.

resample_flac.bash

#!/usr/bin/env bash
# A script to resample your FLAC files *and* make sure they conform to the FLAC Subset
# specification so they will play in pretty much all hardware players - e.g. portable
# music players like those made by COWON - all this while minimizing file sizes.

# Requirements:
# - Bash 4 or newer (for the globstar)
# - sox
# - flac

if ((${BASH_VERSION:0:1} > 3)) && [ -n "$(which flac)" ] && [ -n "$(which sox)" ]:
  shopt -s globstar
  
  for f in **/*.flac; do
    sox_options=''
    if (($(metaflac --no-filename --show-bps "$f") > 16)); then
      sox_options="-b 16"
    fi
    if (($(metaflac --no-filename --show-sample-rate "$f") > 44100)); then
      sox_options="$sox_options -r 44100"
    fi
    if [ -n "$sox_options" ]; then
      tmp_name="${f:0:(-4)}.new.flac"
      if sox -DG "$f" $sox_options "$tmp_name"; then
        mv "$f" "${f}.original"
        mv "$tmp_name" "$f"
        if flac -l 12 -b 4096 -m -e -r 0,8 -p -s "$f" -o "$tmp_name" && (($(stat -f %z "$f") > $(stat -f %z "$tmp_name"))); then
          mv -f "$tmp_name" "$f"
        fi
        echo "$f" >> ~/resampled_tracks.txt
      fi
      rm "$tmp_name"
    fi
  done
  echo "Done."
else
  echo "System requirements are not satisfied."
fi