FLAC to MP3 Encoding Script

[Sniffer]

Thanks

Great Work indeed.

[Lostincyberspace]

Is there any way you could set it up so i can select the song in nautilus and have it convert it right there. I know it is possible but I don't know enough about bash scripting to be able to make it work.

[Fynn]

I must be doing something wrong with the flac to mp3 (new version) as it's giving me the error '19: Syntax error: "}" unexpected' after Lame does it's thing.

UPDATE:

Came downstairs this morning and it appears to have worked!

http://ubuntuforums.org/showthread.php?t=499045
explains what I was seeing...

Many thanks.

UPDATE 2:

... but Nitin Sawhney appears to have inherited Anthrax's summary data.

[eti.que]

Hello all,

Reviving this thread a bit. I updated the script from Tom Mann to include a kind of "MP3 folder cleanup".

Basically anything that is recorded in the database and not present anymore in the flacdir will be removed.

#!/bin/bash
#!/bin/sh

# flactomp3.sh v0.01
# converts all flac files recursively found at $flacdir
# and creates MP3s of them at mp3dir, following any
# existing directory structure.
#
# Requirements
# lame, flac.

flacdir="/media/Musique/Librairie/"
mp3dir="/media/Musique/Baladeur/"
dbfilename="$mp3dir.convert_db"
logfile="$mp3dir.log"

function createmp3 {
      flac -dc "$1" | lame -V 5 -h \
      --tt "$TITLE"\
      --tl "$ALBUM"\
      --tn "$TRACKNUMBER"\
      --ty "$DATE"\
      --ta "$ARTIST"\
      --ty "${DATE%%-*}"\
      --id3v2-only\
      --replaygain-accurate\
      --ignore-tag-errors\
      - "$2"
	  chmod 775 "$2"
	  chgrp users "$2"
}

function getmd5 {
  md5=`md5sum $1`
  flacmd5="${md5%% $1}"
  flacmd5="${flacmd5/[/}"
  flacmd5="${flacmd5/]/}"
}

function readmd5 {
  md5=`cat "$dbfilename" | grep $1`
  storedmd5="${md5%% $1}"
  storedmd5="${storedmd5/[/}"
  storedmd5="${storedmd5/]/}"
}

function storemd5 {
  if [ ! "x$storedmd5" == "x" ] # x added as "" is not a valid input for a test
  then
    sed -i 's|'"$storedmd5  $barefile"'||g' "$dbfilename"
    cat "$dbfilename" | awk '$0!~/^$/ {print $0}' "$dbfilename" > "$dbfilename".tmp
    mv "$dbfilename.tmp" "$dbfilename" # remove blank lines
    # TODO: the sed statement above can break if there is more than one of the same entry!
  fi
  echo "$flacmd5 $1" >> "$dbfilename"
}

function makedir {
  if [ ! -d "$1" ]
  then
    mkdir -p "$1"
echo "Folder $1 created." >> "$logfile"
	fi
}

# test to see if the flac md5 database exists: if not create it
if [ ! -f "$dbfilename" ]
then
  touch "$dbfilename"
fi

if [ ! -f "$logfile" ]
then
	touch "$dbfilename"
else
	rm "$logfile"
	touch "$logfile"
fi

# test to see if the mp3 directory exists: if not create it
makedir "$mp3dir"

# main loop - we go into directories, make sure the mp3
# equivalent directory exists, create it if not, then
# convert each file across.

export IFS=$'\n'

#MP3 Database cleanup
for dir in $(find "$mp3dir" -type d)
do
	if [ ! "$dir" == "$mp3dir" ]
	then

		#Remove any empty folder
		rmdir --ignore-fail-on-non-empty "$dir"
		
		#Get the artist & artist/album pattern
		dir="${dir#$mp3dir}"


		#Select only the tracks matching the above pattern
		for track in $(cat "$dbfilename" | grep "$dir/")
		do
			#Retrieve track from the database
			track="${track#*  }"
			
			#Check if the folder still exists in $flacdir
			if [ ! -d "$flacdir$dir" ]
			then
				
				#Remove the entry if not
				sed -i 's|'".*$track"'||g' "$dbfilename"
				cat "$dbfilename" | awk '$0!~/^$/ {print $0}' "$dbfilename" > "$dbfilename".tmp
				mv "$dbfilename.tmp" "$dbfilename" # remove blank lines

				#Remove the folder if not removed before
				if [ -d "$mp3dir$dir" ]
				then
echo "$dir has been removed from \$mp3dir" >> "$logfile"
					rm -r "$mp3dir$dir"
				fi
			
			#Folder still exists
			else
				#Check if file still exists
				if [ ! -f "$flacdir$track.flac" ]
				then
					#Remove the entry if not
					sed -i 's|'".*$track"'||g' "$dbfilename"
					cat "$dbfilename" | awk '$0!~/^$/ {print $0}' "$dbfilename" > "$dbfilename".tmp
					mv "$dbfilename.tmp" "$dbfilename" # remove blank lines
					
					#Remove the file if it still exists
					if [ -f "$mp3dir$track.mp3" ]
					then
echo "$track has been removed from \$mp3dir" >> "$logfile"
						rm "$mp3dir$track.mp3"
					fi
				fi
			fi
		done
	fi
done

for flac in $(find "$flacdir" -type f)
do
	# check we're dealing with a .flac
	if [ "${flac##/*.}" == "flac" ]
	then
		track="${flac#$flacdir}"
		track="${track%.flac}"
		
		# check that the file does not have a matching entry in our md5 database
		getmd5 "$flac"
		readmd5 "$track"
		if [ ! "$storedmd5" == "$flacmd5" ]
		then

			# replace flac directory structure with mp3 directory structure
			mp3="$mp3dir$track.mp3"

			# retrieve tags
			metaflac --export-tags-to=- "$flac" | sed 's/=\(.*\)/="\1"/' > /tmp/flacmeta.tmp
			. /tmp/flacmeta.tmp
			rm /tmp/flacmeta.tmp
echo "Tag values: $ARTIST/($DATE) $ALBUM/$TRACKNUMBER. $TITLE" >> "$logfile"
			# check target directory exists, creating it if necessary
			targetdir="${mp3%/*.mp3}"
			makedir "$targetdir"

			# convert flac to mp3, preserving tags
			createmp3 "$flac" "$mp3"


			# finally store the md5 in our database as we have
			# created the mp3 successfully.
			if [ $? == 0 ]
			then
echo "$flac correctly encoded to $mp3" >> "$logfile"
				storemd5 "$track"
			fi
		fi
	fi
done
export IFS=" "

So far it works well. If it can be of any use to somebody...

Ah, one thing, if anyone knows how to benefit from a multicore/hyperthreaded CPU, it would be nice ! (I have an Atom 330, 2 cores with HT)

I was thinking of creating a separate script for the encoding and launching 2 or 3 cronjobs in the same time, but that's a bit, errhhh, wild, and I wonder how to handle possible conflicts.

Well, we'll see !
Cheers

[monsterstack]

Useful stuff. I'll see if I can be bothered to add in some getopts so people can set the "in" and "out" directories from the commandline, a bit like "mp3Demflacs -i /home/user/flacs/ -o /home/user/mp3s".

[DarkWan]

Useful stuff. I'll see if I can be bothered to add in some getopts so people can set the "in" and "out" directories from the commandline, a bit like "mp3Demflacs -i /home/user/flacs/ -o /home/user/mp3s".

try something like this

#!/bin/bash
#!/bin/sh

# flactomp3.sh v0.01
# converts all flac files recursively found at $flacdir
# and creates MP3s of them at mp3dir, following any
# existing directory structure.
#
# Requirements
# lame, flac.

flacdir="/media/Musique/Librairie/"
mp3dir="/media/Musique/Baladeur/"

while [ ! -z "$1" ]; do
    case $1 in
        -i | --input_file )
            shift
            flacdir=$1
            ;;
        -o | --output_file )
            shift
            mp3dir=$1
            ;;
    esac
    shift
done

dbfilename="$mp3dir.convert_db"
logfile="$mp3dir.log"

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