ffmpeg

FFmpeg README
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1) Documentation
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* Read the documentation in the doc/ directory.

2) Licensing
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* Read the file COPYING.LGPL. FFmpeg and the associated libraries EXCEPT
for libpostproc and libswscale are licensed under the GNU Lesser General
Public License.

* libpostproc and libswscale are distributed under the GNU General Public
License, see the file COPYING.GPL for details. Their compilation and use
in FFmpeg is optional.

* The file libavcodec/i386/idct_mmx.c is distributed under the GNU General
Public License. It is strictly an optimization and its use is optional.

* The file libavcodec/ac3dec.c is distributed under the GNU General Public
License. In order for (E-)AC-3 decoding to work you need to enable GPL
components.

* The file libavdevice/x11grab.c is distributed under the GNU General
Public License. X11 grabbing is optional.

* The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c
are taken from libjpeg, see the top of the files for licensing details.

* The file libavcodec/fdctref.c is copyrighted by the MPEG Software Simulation
Group with all rights reserved. It is only used to create a DCT test program
and not compiled into libavcodec.