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"audio.txt" -- Hints for converting Audio files from one format to another

Also see "sound.txt" for controling the sound system

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Lossless spliting of MP3 files

See MP3Split on wikipedia
   http://en.wikipedia.org/wiki/Mp3splt

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ID3 tag handling

  xmms   This can set ID3 tags, however sometimes while a tag is changed
         that tag is not used by xmms in its play list!!!!

  easytag   Very good GUI tagging  -- the best solution
            Automatically tags files that have no tags,
            or re-tags according to filename rules you specify
            or renames according to tags.

  id3lib RPM
     id3convert
     id3cp
     id3info
     id3tag

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FROM "wav" files...

mp3...
    lame -h -tt "$title" \
            -ta "$artist" \
            -tl "$album" \
            -tg "$genre" \
            -tn "$track" \
            -ty "$year"  music.wav  music.mp3

  add "-b 192" for very high bitrate quality

ogg...
    oggenc -q 10  -t "$title" \
                  -a "$artist" \
                  -l "$album" \
                  -G "$genre" \
                  -N "$track" \
                  -d "$year"
            -o music.ogg  music.wav


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TO "wav" format..

The "$opts" file is the options needed to convert wav to mp3 format

m4a
    faad -i "$m4a" | sed -n '
          s/["`$]/\\\&/g   # handle any escapes in titles
          s/^title: \(.*\)$/--tt "\1"/p
          s/^artist: \(.*\)$/--ta "\1"/p
          s/^album: \(.*\)$/--tl "\1"/p
          s/^track: \(.*\)$/--tn "\1"/p
          s/^date: \([12][0-9][0-9][0-9]\)$/--ty "\1"/p  # year?
        # s/^genre: \(.*\)$/--tg "\1"/p   # m4a genres dont match those of mp3
        ' - > "$opts"
     faad "music.m4a"

ogg
  Convert the music info to lame options
    ogginfo "$ogg" | sed -n '
         s/^ *title=\(.*\)$/--tt "\1"/p
         s/^ *artist=\(.*\)$/--ta "\1"/p
         s/^ *album=\(.*\)$/--tl "\1"/p
         s/^ *tracknumber=\(.*\)$/--tn "\1"/p
        ' - > "$opts"

flac
  metaflac --list "$flac" | sed -n '
         s/^.* TITLE=\(.*\)$/--tt "\1"/p
         s/^.* ARTIST=\(.*\)$/--ta "\1"/p
         s/^.* ALBUM=\(.*\)$/--tl "\1"/p
         s/^.* TRACKNUMBER=\(.*\)$/--tn "\1"/p
        ' - > "$opts"
  flac --decode "$flac"

mp3 to wav
    mpg123 --wav music.wav music.mp3
    # or mpg321 from freshrpms

wma
  #/bin/bash

  mplayer -ao pcm music.wav  music.wma && \
     mv audiodump.wav "$wav"

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m4a to mp3

   mencoder music.m4a -o music.mp3 -oac mp3lame

You can add  -lameopts   to specify bitrates or other lame options
It is unknown wether the above also preserves the music "info"

Using vlc

   vlc --no-repeat  --no-loop --sout "#transcode{acodec=mp3,ab=128,channels=2,samplerate=44100}:std{access=file,mux=raw,dst=OUTPUT}"  INPUT

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YouTube Video to Audio

From
http://www.linuxjournal.com/content/grabbing-your-music-youtube-do-it-your-way

  # download the video
  youtube-dl http://www.youtube.com/watch?v=6E2hYDIFDIU

  # extract the audio
  ffmpeg -i 6E2hYDIFDIU.flv 6E2hYDIFDIU.wav

  # convert to mp3
  lame 6E2hYDIFDIU.wav 6E2hYDIFDIU.mp3


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mp3  Editing...

  # convert to wav
  mpg123  -w sound.wav sound.mp3

  # now use 'sweep' to edit the wav file

  # convert back
  lame -h sound.wav sound.mp3

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