Most files in FFmpeg are under the GNU Lesser General Public License version 2.1
or later (LGPL v2.1+). Read the file
COPYING.LGPLv2.1 for details. Some other
files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to
Some optional parts of FFmpeg are licensed under the GNU General Public License
version 2 or later (GPL v2+). See the file
COPYING.GPLv2 for details. None of
these parts are used by default, you have to explicitly pass
configure to activate them. In this case, FFmpeg's license changes to GPL v2+.
Specifically, the GPL parts of FFmpeg are:
- optional x86 optimizations in the files
- libutvideo encoding/decoding wrappers in
- the X11 grabber in
- the swresample test app in
- the following filters in libavfilter:
Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then
the configure parameter
--enable-version3 will activate this licensing option
for you. Read the file
COPYING.LGPLv3 or, if you have enabled GPL parts,
COPYING.GPLv3 to learn the exact legal terms that apply in this case.
There are a handful of files under other licensing terms, namely:
- The files
libavcodec/jrevdct.care taken from libjpeg, see the top of the files for licensing details. Specifically note that you must credit the IJG in the documentation accompanying your program if you only distribute executables. You must also indicate any changes including additions and deletions to those three files in the documentation.
tests/reference.pnmis under the expat license.
FFmpeg can be combined with a number of external libraries, which sometimes affect the licensing of binaries resulting from the combination.
The following libraries are under GPL:
When combining them with FFmpeg, FFmpeg needs to be licensed as GPL as well by
--enable-gpl to configure.
The OpenCORE and VisualOn libraries are under the Apache License 2.0. That
license is incompatible with the LGPL v2.1 and the GPL v2, but not with
version 3 of those licenses. So to combine these libraries with FFmpeg, the
license version needs to be upgraded by passing
--enable-version3 to configure.
The Fraunhofer AAC library, FAAC and aacplus are under licenses which
are incompatible with the GPLv2 and v3. We do not know for certain if their
licenses are compatible with the LGPL.
If you wish to enable these libraries, pass
--enable-nonfree to configure.
But note that if you enable any of these libraries the resulting binary will
be under a complex license mix that is more restrictive than the LGPL and that
may result in additional obligations. It is possible that these
restrictions cause the resulting binary to be unredistributeable.