Bash script to convert all *flac to *.mp3 with FFmpeg?

Question

I want to convert all *.flac to *.mp3 in the specific folder.

This is what I've tried, but not works:

# change to the home directory
cd ~/music
# convert all *.flac files
ffmpeg -i *.flac -acodec libmp3lame *.mp3
# (optional: check whether there are any errors printed on the terminal)
sleep 60

How to get my goal?

Answer 1

Try this:

for i in *.flac ; do 
    ffmpeg -i "$i" -acodec libmp3lame $(basename "${i/.flac}").mp3 
    sleep 60 
done

Answer 2

A simple 1 liner solution: find -name "*.flac" -exec ffmpeg -i {} -acodec libmp3lame -ab 128k {}.mp3 \;

http://lewisdiamond.blogspot.ca/2012/01/converting-flac-to-mp3.html

Note that this will be applied recursively in the given directory. I.e. if you run this from your Music folder, it will convert all flacs from subfolders and produce a .mp3 next to it. You may also do it without ffmpeg by directly using flac and lame (i.e. read w/ flac, pipe to lame, output to a file .mp3), as shown in the link.

Answer 3

If you have some white spaces in the file names:

for a in *.flac; do
  f="${a[@]/%flac/mp3}"
  ffmpeg -i "$a" -qscale:a 0 "$f"
done

Answer 4

I worked on @Ketan's answer using avconv, since ffmpeg doesn't work well over here.

for i in *.flac ; do 
    avconv -i "$i" "./mp3/$i".mp3
done

This converts flac files in a folder into mp3 files and moves then to an existing "mp3" folder. Files will be named in the model "original_name.flac.mp3"

Answer 5

Parallel FTW (no doubt you have more than one core - why not use them?):

ls *flac | while read f; do ffmpeg -i "$f" -acodec libmp3lame $f.mp3 & done

Answer 6

find . -maxdepth 1 -type f -name '*.flac' | while IFS= read -r f; do
  ffmpeg -i  "$f" -acodec libmp3lame "$( sed -e's/\.flac/.mp3/g' <<< $f )"
done

Answer 7

For example, if you have multiple avi files:

ls *.avi | xargs -I {} ffmpeg -i {} {}.mp3

Answer 8

If it can help .... I've written a small bash script to do this .... You need to have ffmpeg / flac installed.

How it works:

It takes 2 arguments :

1. The folder of your music library (flac/ogg/mp3 ...)
2. The destination folder (you need to create it before).

It produce :

• An exact copy from the source folder into the destination folder, with:
  • the non flac files copied into.
  • the flac files transformed to mp3 ( VBR high quality)
• A run.sh file with the commands to convert the flac files (this script is executed automatically).

#!/bin/bash

FLAC_PATH=$1
CONV_PATH=$2

DEBUG=0;

function usage {
  echo "";
  echo "    This script convert all flac files from a folder to mp3 files to a second folder";
  echo "";
  echo "    Usage :";
  echo "        ./conv.sh {Source Folder} {Destination Folder}";
  echo "        note : booth folder must exist before starting this script";
  echo "               files other than flac are copied to the destination folder";
  echo "";
}

if [ ! -d "$2" ]; then
  echo "";
  echo " ERROR : [$2] is not a directory.";
  usage
  exit 1
fi;

if [ ! -d "$2" ]; then
  echo "";
  echo " ERROR : [$2] is not a directory.";
  usage
  exit 1
fi;

COMMANDS="run.sh"
echo "" > run.sh
echo " convert from $FLAC_PATH to $CONV_PATH ";

find "${FLAC_PATH}" -type f |while read myFile; do
  SRC_DIR=${myFile%/*}
  SRC_FILE=${myFile##*/}
  DST_DIR=$CONV_PATH/$SRC_DIR
  mkdir -p "${DST_DIR}"
  # TEST if the file is a flac ....
  metaflac --show-md5sum "${myFile}" 2>/dev/null 1>/dev/null
  if [ $? -eq 0 ]; then
    echo -n "  *** $myFile [FLAC !] : "
    DST_FILE=${myFile%.*}
    OUT_PATH="${DST_DIR}/$( echo $SRC_FILE | sed -e 's/.flac$/.mp3/')"

    if [ $DEBUG == 1 ]; then
      echo "  SRC = $myFile";
      echo "  OUT = $OUT_PATH"
    fi;

    if [ -f "$OUT_PATH" ]; then
      echo "  exist, do nothing !";
    else
      echo "  add to compress list !";
      echo "ffmpeg -y -i \"${myFile}\" -codec:a libmp3lame -q:a 0 -map_metadata 0 -id3v2_version 3 \"${OUT_PATH}\" " >> $COMMANDS
    fi;

  else
     echo -n "  *** $SRC_FILE  [NOT FLAC] : "
     if [ -f "${CONV_PATH}/${myFile}" ]; then
       echo " exist, do nothing !"
     else
       echo "  copy."
       cp "${myFile}" "${CONV_PATH}/${myFile}"
     fi
  fi

done;

echo " And now, CONVERT THE FLAC's!!! "
sh run.sh

Answer 9

for a in *.flac

do OUTF=echo "$a" | sed s/\.flac$/.mp3/g

ffmpeg -i "$a" -acodec libmp3lame "$OUTF"

done