User:Memeplex/Convert Any To Mp3

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Below is a script that will convert a lot of audio formats to MP3 via the commandline. It has MPlayer, mutagen and lame as dependencies, so it should accept every format that bot mutagen and player accept.

Basically, mp3ify <input_dir> [<output_dir>] transforms structure <input_dir>/X/Y/... to structure <output_dir>/X/Y/... according to the following rules:

  • flac, ogg, m4a, ape, aac, mpc files will be encoded to mp3 preserving tags.
  • Everything else will be copied without modification.

Default output_dir is /tmp/mp3ify.

lame settings fine-tunning is done editing the configuration variables at the top of the script.


#!/bin/bash

DEFAULT_OUTPUT_DIR=/tmp/mp3ify
QUALITY=2
VBR_QUALITY=4
MIN_BITRATE=64
MAX_BITRATE=256
SAMPLE_FREQ=44.1


function any_to_mp3 {

  PIPE=`mktemp -u -t mp3ify.pipe.XXXXXX`
  mkfifo "$PIPE"

  mplayer -ao pcm -ao pcm:file="$PIPE" "$INPUT_FILE" -noconsolecontrols > /dev/null 2>&1 &

  lame -m j -q $QUALITY -v -V $VBR_QUALITY -b $MIN_BITRATE \
       -B $MAX_BITRATE -s $SAMPLE_FREQ "$PIPE" "$OUTPUT_FILE" > /dev/null 2>&1

  rm "$PIPE"

  python2 -c "
import mutagen
input = mutagen.File(\"$INPUT_FILE\", easy = True)
output = mutagen.File(\"$OUTPUT_FILE\", easy = True)
for tag in [ 'artist', 'album', 'tracknumber', 'date', 'genre', 'title', 'comment' ]:
  value = input.get(tag)
  if value: output[tag] = value[0]
output.save(v1=2)"
}


function usage {

  echo "mp3ify <input_dir> [<output_dir>]

  Transforms structure <input_dir>/X/Y/... to structure <output_dir>/X/Y/...
  according to the following rules:

    flac, ogg, m4a, ape, aac, mpc files will be encoded to mp3 preserving tags.

    Everything else will be copied without modification.

  Requires: mplayer, lame, mutagen.
"
  exit 1
}


INPUT_DIR="$1"
[ -d "$INPUT_DIR" ] || usage
OUTPUT_DIR="${2:-$DEFAULT_OUTPUT_DIR}"

find "$INPUT_DIR" -name '*.*' | while read INPUT_FILE
do
  INPUT_EXTENSION="${INPUT_FILE##*.}"
  OUTPUT_FILE="$OUTPUT_DIR/${INPUT_FILE#$INPUT_DIR}"
  mkdir -p "`dirname "$OUTPUT_FILE"`"

  case $INPUT_EXTENSION in
  flac|m4a|ogg|ape|aac|mpc)
    OUTPUT_FILE="${OUTPUT_FILE%.$INPUT_EXTENSION}.mp3"
    echo -n "Converting ${INPUT_FILE##*/}... "
    any_to_mp3
    ;;
  *)
    echo -n "Copying ${INPUT_FILE##*/}... "
    cp "$INPUT_FILE" "$OUTPUT_FILE"
    ;;
  esac

  echo "done."
done