Linux audio

Audio Conversion using Virtual FS

mp3fs

Example:

mp3fs -b 224 ~/Music /mnt/mp3 -o allow_other,ro

GUI Audio Conversion

Nautilus Audio Converter

Install with

sudo apt-get install wavpack mppenc libmpcdec3 faac flac vorbis-tools faad lame libid3-3.8.3-dev nautilus-script-audio-convert

libid3-3.8.3-dev needed for id3tag.

See Ubuntu Geek - Simplest way to convert audio file(s) on Ubuntu Linux

Gnome Sound Converter

Very nice utility.

• Can convert to flac, ogg, mp3.
• Output to given directory, in {artis - album} format
• mp3, support lame vbr (but apparently --vbr-old only) — done via GStreamer pipeline.

CLI Audio Conversion

flac - FLAC encoder / decoder

flac -d source.flac
flac -d source.flac -o output.wav
flac -d source.flac -c                 # Write output to stdout

lame - MP3 encoder / decoder

See also Technical information on encoding settings.

lame -m auto --preset standard input.wav output.mp3       # Equiv to fast standard
lame -m auto --preset fast standard input.wav output.mp3  # Equiv to -V2 (~192kbps)
lame -m auto --preset extreme input.wav output.mp3        # Equiv to fast extreme
lame -m auto --preset fast extreme input.wav output.mp3   # Equiv to -V0 (~256kbps)
lame -m auto --preset insane input.wav output.mp3         # Equiv to -b 320

twolame - MP2 encoder / decoder

twolame -b 256 input.wav -o "output.mp3"

pacpl - Multi-format encoder / decoder in Perl

# From FLAC to MP3 - Using LAME (extreme quality) - recurse & keep directory structure
pacpl --to mp3 -r -p flac/ --outdir /media/USB --encoder lame --defopts 0 --eopts="-m auto --preset fast extreme"
# To decrease encoding priority:
nice -n 19 pacpl ...

To change the directory structure from "Artist - Album" to "Artist/Album":

for i in *; do eval $(echo $i | sed -r '/ - /!s/(.*)/ARTIST=Various;ALBUM="\1"/; / - /s/(.*) - (.*)/ARTIST="\1"; ALBUM="\2"/'); mkdir "$ARTIST"; mv "$i" "$ARTIST/$ALBUM"; done

yaflac2mp3 - Yet Another FLAC to MP3 script

An handy script to transcode from FLAC to MP3. Could be used as a basis for customized script. See also [1] for more ideas.

yaflac2mp3.sh -s . -d mp3

Conversion in integrated players

Banshee

• Plug external mp3 player device
• Right click on device in Banshee
• Select the media type (ogg, mp3), then click on edit button.
  • For mp3, quality goes from 0 (worst) to 9 (best). 7 seems equivalent to lame -V 2, i.e. fast standard preset, and 9 seems equivalent to lame -V 0, ie. fast extreme preset
• BUG? — apparently can't save to .ogg although ogg is selected as encoder... — SOLVED see below.
• BUG? — export all files in device root directory — SOLVED see below.
• Create a file named ..is_audio_player in device root directory. For instance, to have audio files added in OGG format to the device, using a 1-folder deep structure (ie. Artist - Album/Track. Title), use the following:

name=SAMSUNG\ YP-U1\ (1GB)
folder_depth=1
output_formats=application/ogg,audio/mpeg,audio/mp3

• More information at [2], [3], [4], [5]

RythmBox

• Can also export to external mp3 player
• BUG? — Apparently only in mp3 (although there are some settings about preferred format in preferences)
• Quality seems to be lame --preset fast standard
• Export in /Artist/Album/Track - Title.mp3