Free vbr. software for linux

mp3plot project prints out a plot of the bitrate distribution of a VBR MP3 file (it will also do it for CBR files although it isnt very meaningful).

It should be architecture independent but I havent tested beyond PCs.
Theres a much more mature tool that does the same and more: mp3stat at signal-lost.homeip.net/projects. mp3stat refuses to work on my system(s) and having an interest in mp3s internal structure I gave a shot at it with mp3plot.

Audio::TagLib::MPEG::XingHeader is an implementation of the Xing VBR headers.

SYNOPSIS

use Audio::TagLib::MPEG::XingHeader;

my $i = Audio::TagLib::MPEG::XingHeader->new($data);
print $i->isValid() ? "valid" : "invalid", "n";

This is a minimalistic implementation of the Xing VBR headers. Xing headers are often added to VBR (variable bit rate) MP3 streams to make it easy to compute the length and quality of a VBR stream. Our implementation is only concerned with the total size of the stream (so that we can calculate the total playing time and the average bitrate). It uses http://home.pcisys.net/~melanson/codecs/mp3extensions.txt and the XMMS sources as references.

new(ByteVector $data)

Parses a Xing header based on $data. The data must be at least 16 bytes long (anything longer than this is discarded).

DESTROY()

Destroy this XingHeader instance

BOOL isValid()

Returns true if the data was parsed properly and if there is a vaild Xing header present.

UV totalFrames()

Returns the total number of frames.

UV totalSize()

Returns the total size of stream in bytes.

IV xingHeaderOffset(PV $version, PV $channelMode) [static]

Returns the offset for the start of this Xing header, given the version and channels of the frame

see Audio::TagLib::MPEG::Header

cutmp3 is a small and fast command line MP3 editor. cutmp3 lets you select sections of an MP3 interactively or via a timetable and save them to separate files without quality loss.
It uses mpg123 for playback and works with VBR files and even with files bigger than 2GB.
Other features are configurable silence seeking and ID3 tag seeking, which are useful for concatenated mp3s.
Playback is realized via mpg123, so be sure to have it installed or at least have a symlink to your favorite mp3 playing program.
I recommend a symlink to mpg321 which works better!
You can mark beginning and end of a segment with a and b and save the segment with s.
Using a timetable or direct times with VBR files delivers exact(!) results at the cost of slightly lower speed. cutmp3 even works with files bigger than 2 GB!
If you want a working graphical software you can try mp3directcut,
which runs fairly well in WINE after I asked the author about a WINEd version.
Installation:
make (you will need readline-devel or similar!)
install it to /usr/bin with
make install
Enhancements:
- A small fix for timetable cutting with negative values has been made.
- Another option for silence seeking has been added.
- The documentation has been updated.

mpgedit is an MPEG 1 layer 1/2/3 (mp3), MPEG 2, and MPEG 2.5 audio file editor that is capable of processing both Constant Bit Rate (CBR) and Variable Bit Rate (VBR) encoded files.
Since no file decoding / encoding occurs during editing, there is no audio quality loss when editing with mpgedit.
When editing VBR files that have a XING header, mpgedit updates the output files XING header information to reflect the new file size and average bit rate.
mpgedit operates in two modes: a command line and a curses-based, full-screen interactive shell. All editing functionality is available in both modes. The chief advantage of the interactive mode comes when using the playback feature for selection and verification of edit begin and end times, which is more rapidly performed interactively.
xmpgedit provides most of the same editing capabilities as the curses-mode mpgedit, but adds a graphical representation of the volume levels of mp3 file being being edited.
Enhancements:
- This release fixes an occasional crash in xmpgedit when adjusting the volume after playback has stopped.
- mpgedit playto start time is fixed, which would play beyond the specified edit time in some circumstances.
- The command "Copy start time" has been added to the xmpgedit edit menu.
- mpgedit playback and editing with the -I option is fixed, which would frequently repeat up to a second of material at the start of the edit.

tooLAME is an optimized Mpeg Audio 1/2 Layer 2 encoder.

It is based heavily on:

- the ISO dist10 code
- improvement to algorithms as part of the LAME project

Installation:

1. edit Makefile
at least change the architecture type (ARCH) to suit your machine.
2. make

Usage:

./toolame [options] < input > < output >

Input File
tooLAME parses AIFF and WAV files for file info
raw PCM is assumed if no header is found
for stdin use a -

Output File
file is automatically renamed from *.* to *.mp2
for stdout use a -

Input Options
-s [int]
if inputting raw PCM sound, you must specify the sample rate
default sample rate is 44.1khz.

-a
downmix from stereo to mono
if the incoming file is stereo, combine the audio into
a single channel

-x
force byte-swapping of the input. (current endian detection is dodgy,
so if toolame produces only noise, use -x )

-g
swap the LR channels of a stereo file

Output Options
-m [char]
the encoding mode (default j)
s stereo
d dual channel
j joint stereo
m mono

-p [int]
which psy model to use (default 1)
Different models for the psychoacoustics
Models: -1 to 4

-b [int]
the total bitrate
For 48/44.1/32kHz default = 192
For 24/22.05/16kHz default = 96

-v [int]
Switch on VBR mode.
The higher the number the better the quality.
Useful range -10 to 10.
See README.VBR for details.

Operation
-f
fast mode turns off calculation of the psychoacoustic model.
Instead a set of default values are assumed

-q [int]
quick mode calculates the psy model every num frames.

Misc
-d emp
de-emphasis (default n)
-c
mark as copyright
-o
mark as original
-e
add error protection
-r
force padding bits off
-D
add DAB extensions
-t [int]
talkativity setting. 0 = no message. 3 = too much information

mpeglib is a mp3 and mpeg I video/audio library for linux.
The library includeds three command line players, for mp3,wav,mpeg video.
Main features:
MPEG I library.
This library contains:
- mpeg I audio player (layer I,II,III (mp3))
- mpeg I video player
- mpeg I system layer player
- wav player
Supported features:
- direct/fast seek in all players
- length detection
- video synchronisation, based on timestamps
- mmx Support where necessary
- VBR/ID3 support for mp3
- shoutcast/icecast support
- CDI/Video CD support
- plugin architecture for input,decoder,output
Supported Outputs:
Audio
- Support for OSS/Linux, Sun
Video
- X11 standard calls (fallback)
- X11 Shared mem
- X11 XFree86 4.0 DGA 2.0 (needs root)
- X11 XFree86 4.0 XVideo Extension (hardware yuv->rgb renderer)
Supported Inputs
- file,http.
- Supports on Linux Video CDs (vcd,cdi)