projects / libav.git / blame
| Commit | Line | Data |
|---|---|---|
| 4656c375 DB |
1 | FFmpeg: |
| 2 | ------- | |
| 3 | ||
| aae9c405 | 4 | Most files in FFmpeg are under the GNU Lesser General Public License version 2.1 |
| ecc1330a DB |
5 | or later (LGPL v2.1+). Read the file COPYING.LGPLv2.1 for details. Some other |
| 6 | files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to | |
| aae9c405 DB |
7 | FFmpeg. |
| 8 | ||
| 9 | Some optional parts of FFmpeg are licensed under the GNU General Public License | |
| ecc1330a | 10 | version 2 or later (GPL v2+). See the file COPYING.GPLv2 for details. None of |
| aae9c405 DB |
11 | these parts are used by default, you have to explicitly pass --enable-gpl to |
| 12 | configure to activate them. In this case, FFmpeg's license changes to GPL v2+. | |
| 13 | ||
| 14 | Specifically, the GPL parts of FFmpeg are | |
| 15 | ||
| 16 | - libpostproc | |
| b2184b9c | 17 | - some x86 optimizations in libswscale |
| aae9c405 DB |
18 | - optional x86 optimizations in the files |
| 19 | libavcodec/x86/h264_deblock_sse2.asm | |
| 20 | libavcodec/x86/h264_idct_sse2.asm | |
| 21 | libavcodec/x86/idct_mmx.c | |
| aae9c405 DB |
22 | - the X11 grabber in libavdevice/x11grab.c |
| 23 | ||
| 4656c375 DB |
24 | There are a handful of files under other licensing terms, namely: |
| 25 | ||
| 26 | * The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c | |
| 27 | are taken from libjpeg, see the top of the files for licensing details. | |
| 28 | ||
| 9cad0e4e DB |
29 | Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then |
| 30 | the configure parameter --enable-version3 will activate this licensing option | |
| 31 | for you. Read the file COPYING.LGPLv3 or, if you have enabled GPL parts, | |
| 32 | COPYING.GPLv3 to learn the exact legal terms that apply in this case. | |
| 33 | ||
| 4656c375 DB |
34 | |
| 35 | external libraries: | |
| 36 | ------------------- | |
| 37 | ||
| aae9c405 DB |
38 | Some external libraries, e.g. libx264, are under GPL and can be used in |
| 39 | conjunction with FFmpeg. They require --enable-gpl to be passed to configure | |
| 40 | as well. | |
| 41 | ||
| 0b175caa DB |
42 | The OpenCORE external libraries are under the Apache License 2.0. That license |
| 43 | is incompatible with the LGPL v2.1 and the GPL v2, but not with version 3 of | |
| 44 | those licenses. So to combine the OpenCORE libraries with FFmpeg, the license | |
| 45 | version needs to be upgraded by passing --enable-version3 to configure. | |
| 46 | ||
| c7279693 DB |
47 | The nonfree external libraries libamrnb, libamrwb and libfaac can be hooked up |
| 48 | in FFmpeg. You need to pass --enable-nonfree to configure to enable them. Employ | |
| 49 | this option with care as FFmpeg then becomes nonfree and unredistributable. |