Free audio transcoding tools software for linux

Audio Tag Tool is a program to manage the information fields in MP3 and Ogg Vorbis files, commonly called tags. It is available under the GNU General Public Licence (GPL).
Please send me any comments or bugs you find (email at the bottom)
Tag Tool can be used to edit tags one by one, but the most useful features are the ability to easily tag or rename hundreds of files at once, in any desired format.
The interface is arranged into two sections, with the list of available files on the left and a set of tabs on the right.
Each tab corresponds to one of the main operations Audio Tag Tool can do:
Tag Editor
- Lets you edit the tags individually.
Tag Multiple Files
- Here you can set the tags of multiple files at once. The tag fields can be set to a fixed value, filled in automatically from the files name, or left alone.
Clear Tags
- Allows you to remove the tags from multiple files at once. For MP3 files it lets you choose to remove only ID3v1 or ID3v2 tags.
Move/Rename Multiple Files
- Here you can rename multiple files at once and/or organize them into directories. File names can be based on the contents of the tag.
Create Playlists
- Generates playlists. Playlists can be sorted by file name or by any tag field.

Audio::ConvTools is a API to convert audio files from/to mp3 ogg and wav.

SYNOPSIS

use Audio::ConvTools;
use Audio::ConvTools qw/:DEFAULT :Tmp :Log/;

$status = ogg2mp3(file.ogg);
$status = ogg2wav(file.ogg);
$status = ogg2wav(in.ogg, out.wav);
$status = mp32ogg(file.mp3);
$status = mp32wav(file.mp3);
$status = mp32wav(in.mp3, out.wav);
$status = wav2ogg(file.wav);
$status = wav2ogg(in.wav, out.ogg);
$status = wav2mp3(file.wav);
$status = wav2mp3(in.wav, out.mp3);

Audio::ConvTools::logMsg(This is a log message);
Audio::ConvTools::errMsg(This is an error message);

$tmp = Audio::ConvTools::getTmpFile(.wav);
Audio::ConvTools::destroyTmpFile($tmp);

Transcode is a suite of command line utilities for transcoding video and audio codecs, and for converting beween different container formats. Transcode can decode and encode many audio and video formats, e.g.
- MPEG-1/2
- MPEG-4(-part 3) (also DivX and XviD variants)
- Quicktime / MPEG-PS (dvd) (decode only)
- MPEG-1-layer-1/2/3 audio
- AC3 audio
Transcode has a variety of video and audio pre and post-processing filters, including (but not limited to):
- video de-interlacing
- audio resampling
- framerate conversion
- smoothing
- cutting
Transcode can import DVDs on-the-fly, or record from Video4Linux (including V4L2 video capturing) devices.
A number of modules are included to enable import of DVDs on-the-fly, Video4Linux (including V4L2 video capturing), MPEG elementary streams (ES) or program streams (VOB), MPEG1/2/4 video, Digital Video (DV), YUV4MPEG streams, Nuppel Video (NUV), quicktime (MOV), MPEG audio layer-1/2/3, WAVE, DIVX, MJPEG, and raw or compressed (pass-through) video frames.
A number of export modules for enable writing DivX ;-), DivX 4.02/5.xx, XviD, Digital Video, MPEG-1/2 or uncompressed AVI files with MPEG, AC3 (pass-through) or PCM audio. More file formats and codecs for audio/video import are supported by the MPlayer and avifile import modules (exporting with avifile is restricted to video codecs, with MPEG/PCM or AC3 (pass-through) audio provided by transcode). Limited DVD subtitle rendering is also available.
Its modular concept is intended to provide flexibility and easy user extensibility to include other video/audio codecs or file types. A set of tools is available to extract, demultiplex and decode the sources into raw video/audio streams for import, non AVI-file export modules for writing single frames (PPM) or YUV4MPEG streams, auto-probing and scanning your sources and to enable post-processing of AVI files, including header fixing, merging multiple files or splitting large AVI files to fit on a CD.
Transcode runs on UN*X like systems like Linux, BSD, and MacOSX.
Transcode loads shared library modules that are responsible for feeding it with raw streams and encoding the frames:
The Import Modules for audio/video decoding are loaded with dlopen system call and are responsible for starting the video and audio streams (directly or via the popen system call) and have a single function interface to the main program. The import is handled by a thread that buffers the video/audio frames.
The main program transcode currently performs a number of simple video/audio frame manipulations (in this order) or allows simple pass-through of raw frame data:
Video:
- cut out arbitray frame region for processing
- de-interlace video frame
- fast enlarging of video width/height by a multiple of 32 rows/column up to 1024x768
- fast reduction of video width/height by a multiple of 32 rows/column
- high-quality resizing with filter
- cut out arbitray frame region for encoding
- rescale (downsample) video width/height by a power of 2
- flip video frame upside down
- mirror image of video frame
- swap R and B bytes in video frame
- transform to b/w video frame
- apply gamma correction
- anti-alias video frame
Audio:
- change the volume of the audio stream
- resample audio stream
- swap byte order in audio stream
- sync video with audio frames (V=0|A=N, V=1|A=N+1,...)
- Filter Plugins:
- Additional effects are available via external filter plugins loaded with option "-J".
The Export Modules for audio/video encoding are loaded via the dlopen system call and the encoder loop is started for the selected frames. In most cases audio and video are handled by the same module.
Enhancements:
- This release includes only critical hotfixes.
- The main highlight is compatibilty with newer releases of ffmpeg libraries.
- Some filters have been updated.

Audio::AMR::Decode is a Perl extension do decode .amr files.

SYNOPSIS

use Audio::AMR::Decode;
Audio::AMR::Decode::amr2raw(infile.amr, outfile.pcm);

This module will attempt to decode an amr encoded audio file to a raw pcm audio encoded file.

The package contains C-source files for the optimized fixed-point speech decoder. The optimized fixed-point speech decoder is bit-exact with 3GPP TS 26.073 fixed-point speech decoder version 4.1.0.

Audio::Mad is a Perl interface to the mad MPEG decoder library.

SYNOPSIS

use Audio::Mad qw(:all);

my $stream = new Audio::Mad::Stream();
my $frame = new Audio::Mad::Frame();
my $synth = new Audio::Mad::Synth();
my $timer = new Audio::Mad::Timer();
my $resample = new Audio::Mad::Resample(44100, 22050);
my $dither = new Audio::Mad::Dither();

my $buffer = join(, );
$stream->buffer($buffer);

FRAME: {
if ($frame->decode($stream) == -1) {
last FRAME unless ($stream->err_ok());

warn "decoding error: " . $stream->error();
next FRAME;
}

$synth->synth($frame);
my $pcm = $dither->dither($resample->resample($synth->samples()));

print $pcm;
next FRAME;
}

This module is an attempt to provide a perl interface to the MAD (MPEG Audio Decoder) library, written by Robert Leslie. It has been designed to be 100% object oriented, and to follow the MAD interface as closely as possible.

So far, most of the MAD library, plus two companion modules are provided as part of the interface. Seperate documentation is provided in perldoc for all of the modules in the Audio::Mad framework.

Audio::ESD is a Perl extension for talking to the Enlightened Sound Daemon.

SYNOPSIS

use Audio::ESD;
my $stream = Audio::ESD->play_stream({ # these are the defaults
sample_rate => 16000,
channels => 1,
fallback => 0,
bits_sample => 16,
encoding => linear })
or die "Failed to open ESD stream: $!n";
print $stream $data; # etcetera

This module provides a Perl wrapper around the Enlightened Sound Daemons client library. Input, output, and monitoring streams are supported, as well as some (but not all) of the control functions. Samples are supported but untested.

Audio::Mad::Util is a utility class for working with mpeg streams.

This module provides some support functions for gathering information out of an mpeg stream.

Currently this module is intended for learning and internal purposes only, it will have better documentation and a cleaner interface in future versions.

Audio::TagLib::AudioProperties is a simple, abstract interface to common audio properties.

DESCRIPTION

The values here are common to most audio formats. For more specific, codec dependant values, please see see the subclasses APIs. This is meant to compliment the Audio::TagLib::File and Audio::TagLib::Tag APIs in providing a simple interface that is sufficient for most applications.

%_ReadStyle

Reading audio properties from a file can sometimes be very time consuming and for the most accurate results can often involve reading the entire file. Because in many situations speed is critical or the accuracy of the values is not particularly important this allows the level of desired accuracy to be set.

keys %Audio::TagLib::AudioProperties::_ReadStyle lists all available values used in Perl code.

see FLAC::Properties MPC::Properties MPEG::Properties Vorbis::Properties

DESTROY()

Destroys this AudioProperties instance.

length() [pure virtual]

Returns the lenght of the file in seconds.

bitrate() [pure virtual]

Returns the most appropriate bit rate for the file in kb/s. For constant bitrate formats this is simply the bitrate of the file. For variable bitrate formats this is either the average or nominal bitrate.

sampleRate() [pure virtual]

Returns the sample rate in Hz.

channels() [pure virtual]

Returns the number of audio channels.