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FreeJ is an instrument for realtime manipulation of various video layers combined with live effects. Layers are implemented to mix together webcams, TV, movie files, images and text and can be rendered in various ways. FreeJ can be operated live using hotkeys, also remotely over networks (VJoE), while operations can also be scripted in a object oriented procedural language (Javascript). The core engine is multithreaded and asynchronous so it can accept various controllers at the same time: both MIDI and joystick controls have been implemented. FreeJ is being developed in the hope to provide the GNU community with a free instrument for video manipulation: to be employed in veejaying, theater performance and digital scenography, while at present is also being used for visualisation in medical analysis.


User guide available in HTML format from

"IRC irc:// " IRC Help channel
"IRC irc:// " IRC development channel

Related Projects

Extensions, plug-ins, or add-ons for this program

Frei0rMinimalistic plugin API for video effects


LicenseVerified byVerified onNotes
GPLv2orlaterJanet Casey26 August 2003

Leaders and contributors

jaromil Maintainer
Full list of FreeJ contributors Contributor

Resources and communication

Audience Resource type URI
Bug Tracking VCS Repository Webview
Developer VCS Repository Webview
Bug Tracking,Developer,Support E-mail

Software prerequisites

Kind Description
Weak prerequisite ffmpeg
Required to use FreeType2 libraries
Required to use SDL libraries
Required to build libSDL
Weak prerequisite javascript
Weak prerequisite freetype
Required to use avifile library

This entry (in part or in whole) was last reviewed on 11 April 2008.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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