The Advanced Linux Sound Architecture is composed of several parts. The first is a fully modularized sound driver which supports module autoloading, devfs, isapnp autoconfiguration, and gives complete access to analog audio, digital audio, control, mixer, synthesizer, DSP, MIDI, and timer components of audio hardware. It also includes a fully-featured kernel-level sequencer, a full compatibility layer for OSS/Free applications, an object-oriented C library which covers and enhances the ALSA kernel driver functionality for applications (client/server, plugins, PCM sharing/multiplexing, PCM metering, etc.), an interactive configuration program for the driver, and some simple utilities for basic management.
libsndfile is a C library for reading and writing sound files such as AIFF, AU, WAV, and others through one standard interface. It can currently read/write 8, 16, 24 and 32-bit PCM files as well as 32 and 64-bit floating point WAV files and a number of compressed formats. It compiles and runs on *nix, MacOS, and Win32.
Python Audio Tools is a collection of audio handling programs that work from the command line. These include programs for CD extraction, track conversion from one audio format to another, track renaming and retagging, track identification, CD burning from tracks, and more. It supports internationalized track filenames and metadata using Unicode. It works with high-definition, multi-channel audio as well as CD-quality. Track conversion uses multiple CPUs or CPU cores if available to greatly speed the transcoding process. Track metadata can be retrieved from MusicBrainz, FreeDB, or compatible servers. Audio formats supported are WAV, FLAC, WavPack, MP3, Ogg Vorbis, M4A, Apple Lossless, and more.
Secret Rabbit Code is a sample rate converter for audio. It is capable of arbitrary and time varying conversions. It can downsample by a factor of 256 and upsample by the same factor. The ratio of input and output sample rates can be a real number. The conversion ratio can also vary with time for speeding up and slowing down effects.
The Helix DNA Producer is a multi-format media-encoding engine for creating streaming broadcasts, on-demand streaming content, and downloadable audio video files. It supports RealAudio, RealVideo, and Ogg Vorbis, and includes many input and output filters, variable bitrate encoding support, option for two-pass encoding, audio gain control, and Firewire support.
MARF is a general cross-platform framework with a collection of algorithms for audio (voice, speech, and sound) and natural language text analysis and recognition, along with sample applications (identification, NLP, etc.) of its use. MARF can run distributed over the network (CORBA, Java RMI, and Java XML-RPC Web Services) and may act as a library in applications or be used as a source for learning and extension.
PHP Video Toolbox is a PHP class that wraps around the FFmpeg, FLVTools2, and Mencoder programs to allow PHP developers to manipulate and convert video files in an easy-to-use object-oriented way. It also currently provides FFmpeg-PHP emulation in pure PHP, so you wouldn't need to compile and install the module. It isn't intended as a FFmpeg-PHP replacement, only an alternative solution. It is recommended that if you make heavy use of the FFmpeg-PHP functionality you should install the module, as it is more efficient.
The JAVE (Java Audio Video Encoder) library is a Java wrapper on the ffmpeg project. Developers can take take advantage of JAVE to transcode audio and video files from one format to another. For example, you can transcode an AVI file to an MPEG one, you can separate and transcode audio and video tracks, and you can resize videos, changing their sizes and proportions. Many other formats, containers, and operations are supported by JAVE.