Most files in FFmpeg are under the GNU Lesser General Public License version 2.1or later (LGPL v2.1+). Read the file COPYING.LGPL for details. Some other fileshave a MIT/X11/BSD-style license. In combination the LGPL v2.1+ applies toFFmpeg.Some optional parts of FFmpeg are licensed under the GNU General Public Licenseversion 2 or later (GPL v2+). See the file COPYING.GPL for details. None ofthese parts are used by default, you have to explicitly pass --enable-gpl toconfigure to activate them. In this case, FFmpeg's license changes to GPL v2+.Specifically, the GPL parts of FFmpeg are- libpostproc- some x86 and AltiVec optimizations in libswscale- optional x86 optimizations in the files libavcodec/x86/h264_deblock_sse2.asm libavcodec/x86/h264_idct_sse2.asm libavcodec/x86/idct_mmx.c- the AC-3 decoder in libavcodec/ac3dec.c- the X11 grabber in libavdevice/x11grab.cSome external libraries, e.g. libx264, are under GPL and can be used inconjunction with FFmpeg. They require --enable-gpl to be passed to configureas well.The nonfree external libraries libamrnb and libamrwb can be hooked up in FFmpeg.You need to pass --enable-nonfree to configure to enable them. Employ this
There are a handful of files under other licensing terms, namely:* 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.