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20.3.2 Compressing Audio Data: Ripping
Audio compression can be handled by various tools. The following sections feature a
command line approach to encoding and playing audio data as well as some graphical
applications capable of audio compression.
Command Line Tools for Encoding and Playback of
Audio Data
Ogg Vorbis (package
vorbis-tools
) is a free audio compression format that is now
supported by the majority of audio players and even portable MP3 players. The Web
page of the project is
http://www.xiph.org/ogg/vorbis
.
Your system comes with several tools supporting Ogg Vorbis.
oggenc
is a command
line tool used for encoding WAV files to Ogg. Just run
oggenc myfile.wav
to
transform a given
.wav
file into Ogg Vorbis. The
-h
option displays an overview of
the other parameters. Oggenc supports encoding with a variable bit rate. In this way,
an even higher degree of compression can be achieved. Instead of the bit rate, specify
the desired quality with the parameter
-q
.
-b
determines the average bit rate.
-m
and
-M
specify the minimum and maximum bit rate.
ogg123 is a command line Ogg player. Start it with a command like
ogg123
mysong.ogg
.
Compressing Audio Data Using KAudioCreator
KAudioCreator is a lean CD ripper application (see Figure 20.3, “Ripping Audio CDs
with KAudioCreator” (page 274)). Once started, it lists all the tracks of your CD in the
CD Tracks tab. Select the tracks to rip and encode. To edit the track information, use
the Album Editor under File > Edit Album. Otherwise just start the ripping and encoding
with File > Rip Selection. Watch the progress of these jobs using the Jobs tab. If con-
figured accordingly, KAudioCreator also generates playlist files for your selection that
can be used by players like amaroK, XMMS, or Helix Banshee.
Playing Music and Movies 273