I'm on Centos 5.5, and would like to use sox to strip out
any periods of silence > 5 seconds from a batch mp3 audio
files.
Googling I found sox, but it does not seem to support mp3
files by default.
The man page says:
.mp3 MP3 Compressed Audio
MP3 audio files come from the MPEG standards for audio and video
compression. They are a lossy compression format that achieves
good compression rates with a mini- mum amount of quality loss.
Also see Ogg Vorbis for a similar format.
MP3 support in SoX is optional and requires access to either
or both the external libmad and libmp3lame libraries. To see if
there is support for Mp3 run sox -h and look for it under the
list of supported file formats as "mp3".
libmad is installed:
Installed Packages
Name : libmad
Arch : i386
Version : 0.15.1b
Release : 4.el5.rf
Size : 138 k
Repo : installed
Summary : MPEG audio decoding library
URL : http://www.underbit.com/products/mad/
License : GPL
Description: MAD (libmad) is a high-quality MPEG audio decoder. It currently
: supports MPEG-1 and the MPEG-2 extension to Lower Sampling
: Frequencies, as well as the so-called MPEG 2.5 format. All three
: audio layers (Layer I, Layer II, and Layer III a.k.a. MP3) are fully
: implemented.
:
: MAD does not yet support MPEG-2 multichannel audio (although it
: should be backward compatible with such streams) nor does it
: currently support AAC.
SoX is installed:
Name : sox
Arch : i386
Version : 12.18.1
Release : 1.el5_5.1
Size : 659 k
Repo : installed
Summary : A general purpose sound file conversion tool.
URL : http://sox.sourceforge.net/
License : GPL
Description: SoX (Sound eXchange) is a sound file format converter SoX can convert
: between many different digitized sound formats and perform simple
: sound manipulation functions, including sound effects.
[root@karsites ~]# sox -h
sox: Version 12.18.1
Usage: [ gopts ] [ fopts ] ifile [ fopts ] ofile [ effect [ effopts ] ]
gopts: -e -h -p -q -S -V
fopts: -r rate -c channels -s/-u/-U/-A/-a/-i/-g/-f -b/-w/-l/-d -v volume -x
effect: avg band bandpass bandreject chorus compand copy dcshift
deemph earwax echo echos fade filter flanger highp highpass lowp
lowpass mask mcompand noiseprof noisered pan phaser pick pitch
polyphase rate repeat resample reverb reverse silence speed stat
stretch swap synth trim vibro vol
effopts: depends on effect
Supported file formats: aiff al alsa au auto avr cdr cvs dat vms gsm
hcom la lu maud nul ossdsp prc raw sb sf sl smp sndt sph 8svx sw txw
ub ul uw voc vorbis vox wav wve
Yet the mp3 support is not showing up for SoX in the above
list of supported file formats.
Any suggestions how to tell SoX to use the mp3 format I
need please?
Or are there any other programs that can be used to strip
silent periods from MP3's?
Using Audacity to manually edit each sound file is
definately NOT and option.
Kind Regards,
Keith Roberts
--
In theory, theory and practice are the same;
in practice they are not.
This email was sent from my laptop with Centos 5.5
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