PortAudio is a free, cross-platform, open-source, audio I/O library.  It lets you write simple audio programs in 'C' or C++ that will compile and run on many platforms. It provides a very simple API for recording and/or playing sound using a simple callback function or a blocking read/write interface. Example programs are included that play sine waves, process audio input (guitar fuzz), record and playback audio, list available audio devices, etc.

PortAudio - Cross-platform Audio I/O Library

FMJ is an alternative to Java Media Framework (JMF), while remaining API-compatible with JMF. It aims to produce a single API/Framework which can be used to capture, playback, process, and stream media across multiple platforms. The sub-projects, FFMPEG-Java and Theora-Java, are Java wrappers for FFMPEG and Vorbis respectively. Its sister project is LTI-CIVIL and it is used as the primary video capture device library. 

FMJ - Freedom for Media in Java

Xuggler is the easy way to uncompress, modify, and re-compress any media file (or stream) from Java. It provides simple API for encoding and decoding audio and video.

Xuggler - Media Tools API in Java

The JAVE (Java Audio Video Encoder) library is Java wrapper on the ffmpeg project. Developers can take take advantage of JAVE to transcode audio and video files from a format to another. You can separate and transcode audio and video tracks, you can resize videos, changing their sizes and proportions and so on. Many other formats, containers and operations are supported by JAVE.

Jave - Java Audio Video Encoder Library

 PyAudio provides Python bindings for PortAudio, the cross-platform audio I/O library. With PyAudio, you can easily use Python to play and record audio on a variety of platforms. 

PyAudio - Python bindings for PortAudio, the cross-platform audio I/O library

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PortAudio - Cross-platform Audio I/O Library

FMJ - Freedom for Media in Java

Xuggler - Media Tools API in Java

Jave - Java Audio Video Encoder Library

PyAudio - Python bindings for PortAudio, the cross-platform audio I/O library

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PortAudio - Cross-platform Audio I/O Library

FMJ - Freedom for Media in Java

Xuggler - Media Tools API in Java

Jave - Java Audio Video Encoder Library

PyAudio - Python bindings for PortAudio, the cross-platform audio I/O library

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