FreeJ

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This article is about the FreeJ Vision Mixer. For the animated series, see Freej.
FreeJ
Freej.png
FreeJ interface
Original author(s) Denis Rojo (Jaromil)
Developer(s) Denis Rojo (Jaromil)
Silvano Galliani (kysucix)
Christoph Rudorff
Initial release May 22, 2001 (2001-05-22)
Stable release 0.10 / May 30, 2008; 6 years ago (2008-05-30)
Preview release 0.11[1] / September 8, 2013; 11 months ago (2013-09-08)[2]
Development status Active
Written in C/C++
Operating system Linux v0.11 and v0.10, Darwin/Mac OS X v0.10
Available in English
Type Digital video compositing
License GNU General Public License v3+[3]
Website freej.dyne.org

FreeJ is a modular video mixer for GNU/Linux systems, dubbed a "vision mixer" by the authors of the software. It is capable of real-time video manipulation, for amateur and professional uses. It can be used as an instrument in the fields of dance theater, veejaying, medical visualisation,[citation needed] and television. FreeJ supports the input of multiple layers of video footage, which can be filtered through special-effect-chains, and then mixed for output.

FreeJ can be operated in real-time from a command line console (S-Lang), and also remotely operated over the network via an SSH connection. The software provides an interface for behavior-scripting (currently accessible through JavaScript). Also, it can be used to render media to multiple screens, remote setups, encoders, and live Internet stream servers.

The core engine is multithreaded and asynchronous, supporting multiple simultaneous veejay-oriented controllers (MIDI, joystick, and wii-mote).

History[edit]

Denis Rojo (aka Jaromil) is the original author, and as of 2013 is the current maintainer. Since 0.7 was released,[when?] Silvano Galliani (aka kysucix) joined the core development team, implementing several new enhancements.

Features[edit]

FreeJ can overlay, mask, transform and filter multiple layers of footage on the screen. It supports an unlimited number of layers that can be mixed, regardless of the source. It can read input from varied sources: movie files, webcams, TV cards, images, renders and Adobe Flash animations.

FreeJ can produce a stream to an icecast server with the video being mixed and audio grabbed from soundcard. The resulting video is accessible to any computer able to decode media encoded with the theora codec.

The console interface of FreeJ is accessible via SSH and can be run as a background process. The remote interface offers simultaneous access from multiple remote locations.

Feature list
  • live composition of multiple sources including webcams, TV signals, movie filters, images, .txt files, particle generators
  • remotely controlled access (Vjoe)
  • scripting abilities in JavaScript
  • playback of Adobe Flash vector animations
  • zero frame drop when looping movie clips
  • Emacs or Vi style console with hotkeys (S-lang)
  • accepts asynchronous controllers at the same time like MIDI and joystick
  • multithreaded video engine with low overhead
  • 100% free software, under the GNU General Public License
  • modular C/C++ code and flexible API
  • uses multicore processors (multithreading)

The authors state that the chosen software license, the GNU General Public License, is also a feature.

Purpose[edit]

While originally written for art productions, FreeJ is billed as a more general purpose tool. The website offers FreeJ for a very diverse market, ranging from video performance artist to medical visualization[citation needed] technologies. It has been used in the past[when?] in media server systems.[citation needed]

References[edit]

  1. ^ [1]
  2. ^ [2]
  3. ^ [3]

External links[edit]