- Qt 6.9
- Qt WebEngine
- Qt WebEngine Licensing
- ffmpeg
- Qt 6.9.0 Reference Documentation

# ffmpeg

Project Homepage

     # License

     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
     FFmpeg.

     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 `--enable-gpl` to
     configure to activate them. In this case, FFmpeg&#x27;s license changes to GPL v2+.

     Specifically, the GPL parts of FFmpeg are:

     - libpostproc
     - optional x86 optimization in the files
         - `libavcodec/x86/flac_dsp_gpl.asm`
         - `libavcodec/x86/idct_mmx.c`
         - `libavfilter/x86/vf_removegrain.asm`
     - the following building and testing tools
         - `compat/solaris/make_sunver.pl`
         - `doc/t2h.pm`
         - `doc/texi2pod.pl`
         - `libswresample/tests/swresample.c`
         - `tests/checkasm/*`
         - `tests/tiny_ssim.c`
     - the following filters in libavfilter:
         - `signature_lookup.c`
         - `vf_blackframe.c`
         - `vf_boxblur.c`
         - `vf_colormatrix.c`
         - `vf_cover_rect.c`
         - `vf_cropdetect.c`
         - `vf_delogo.c`
         - `vf_eq.c`
         - `vf_find_rect.c`
         - `vf_fspp.c`
         - `vf_histeq.c`
         - `vf_hqdn3d.c`
         - `vf_kerndeint.c`
         - `vf_lensfun.c` (GPL version 3 or later)
         - `vf_mcdeint.c`
         - `vf_mpdecimate.c`
         - `vf_nnedi.c`
         - `vf_owdenoise.c`
         - `vf_perspective.c`
         - `vf_phase.c`
         - `vf_pp.c`
         - `vf_pp7.c`
         - `vf_pullup.c`
         - `vf_repeatfields.c`
         - `vf_sab.c`
         - `vf_signature.c`
         - `vf_smartblur.c`
         - `vf_spp.c`
         - `vf_stereo3d.c`
         - `vf_super2xsai.c`
         - `vf_tinterlace.c`
         - `vf_uspp.c`
         - `vf_vaguedenoiser.c`
         - `vsrc_mptestsrc.c`

     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/jfdctfst.c`, `libavcodec/jfdctint_template.c` and
       `libavcodec/jrevdct.c` are 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.pnm` is under the expat license.

     ## External libraries

     FFmpeg can be combined with a number of external libraries, which sometimes
     affect the licensing of binaries resulting from the combination.

     ### Compatible libraries

     The following libraries are under GPL version 2:
     - avisynth
     - frei0r
     - libcdio
     - libdavs2
     - librubberband
     - libvidstab
     - libx264
     - libx265
     - libxavs
     - libxavs2
     - libxvid

     When combining them with FFmpeg, FFmpeg needs to be licensed as GPL as well by
     passing `--enable-gpl` to configure.

     The following libraries are under LGPL version 3:
     - gmp
     - libaribb24
     - liblensfun

     When combining them with FFmpeg, use the configure option `--enable-version3` to
     upgrade FFmpeg to the LGPL v3.

     The VMAF, mbedTLS, RK MPI, 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 smbclient library is under the GPL v3, to combine it with FFmpeg,
     the options `--enable-gpl` and `--enable-version3` have to be passed to
     configure to upgrade FFmpeg to the GPL v3.

     ### Incompatible libraries

     There are certain libraries you can combine with FFmpeg whose licenses are not
     compatible with the GPL and/or the LGPL. If you wish to enable these
     libraries, even in circumstances that their license may be incompatible, pass
     `--enable-nonfree` to configure. This will cause the resulting binary to be
     unredistributable.

     The Fraunhofer FDK AAC and OpenSSL libraries are under licenses which are
     incompatible with the GPLv2 and v3. To the best of our knowledge, they are
     compatible with the LGPL.

     ********************************************************************************

     libavformat/oggparsetheora.c

     Copyright (C) 2005  Matthieu CASTET, Alex Beregszaszi

     Permission is hereby granted, free of charge, to any person
     obtaining a copy of this software and associated documentation
     files (the &quot;Software&quot;), to deal in the Software without
     restriction, including without limitation the rights to use, copy,
     modify, merge, publish, distribute, sublicense, and/or sell copies
     of the Software, and to permit persons to whom the Software is
     furnished to do so, subject to the following conditions:

     The above copyright notice and this permission notice shall be
     included in all copies or substantial portions of the Software.

     THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,
     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     DEALINGS IN THE SOFTWARE.

     ********************************************************************************

     libavutil/x86/x86inc.asm

     x86inc.asm: x86 abstraction layer

      Copyright (C) 2005-2024 x264 project

      Authors: Loren Merritt &lt;lorenm@u.washington.edu&gt;
               Henrik Gramner &lt;henrik@gramner.com&gt;
               Anton Mitrofanov &lt;BugMaster@narod.ru&gt;
               Fiona Glaser &lt;fiona@x264.com&gt;

      Permission to use, copy, modify, and/or distribute this software for any
      purpose with or without fee is hereby granted, provided that the above
      copyright notice and this permission notice appear in all copies.

      THE SOFTWARE IS PROVIDED &quot;AS IS&quot; AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

     ********************************************************************************

     libavcodec/mips/compute_antialias_fixed.h
     libavcodec/mips/compute_antialias_float.h
     libavutil/fixed_dsp.c
     libavutil/fixed_dsp.h
     libavutil/mips/libm_mips.h
     libavutil/softfloat_tables.h

     Copyright (c) 2012
     MIPS Technologies, Inc., California.

     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions
     are met:
     1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
     2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
     3. Neither the name of the MIPS Technologies, Inc., nor the names of its
     contributors may be used to endorse or promote products derived from
     this software without specific prior written permission.

     THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS&#x27;&#x27; AND
     ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
     FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     SUCH DAMAGE.

     Authors:
     Branimir Vasic   (bvasic@mips.com)
     Darko Laus       (darko@mips.com)
     Djordje Pesut    (djordje@mips.com)
     Goran Cordasic   (goran@mips.com)
     Nedeljko Babic   (nedeljko.babic imgtec com)
     Mirjana Vulin    (mvulin@mips.com)
     Stanislav Ocovaj (socovaj@mips.com)
     Zoran Lukic      (zoranl@mips.com)

     ********************************************************************************

     libavformat/oggdec.c
     libavformat/oggdec.h
     libavformat/oggparseogm.c
     libavformat/oggparsevorbis.c

     Copyright (C) 2005  Michael Ahlberg, MÃ¥ns RullgÃ¥rd

     Permission is hereby granted, free of charge, to any person
     obtaining a copy of this software and associated documentation
     files (the &quot;Software&quot;), to deal in the Software without
     restriction, including without limitation the rights to use, copy,
     modify, merge, publish, distribute, sublicense, and/or sell copies
     of the Software, and to permit persons to whom the Software is
     furnished to do so, subject to the following conditions:

     The above copyright notice and this permission notice shall be
     included in all copies or substantial portions of the Software.

     THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,
     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     DEALINGS IN THE SOFTWARE.

     ********************************************************************************

                       GNU LESSER GENERAL PUBLIC LICENSE
                            Version 2.1, February 1999

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     [This is the first released version of the Lesser GPL.  It also counts
      as the successor of the GNU Library Public License, version 2, hence
      the version number 2.1.]

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     You are not responsible for enforcing compliance by third parties with
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       11. If, as a consequence of a court judgment or allegation of patent
     infringement or for any other reason (not limited to patent issues),
     conditions are imposed on you (whether by court order, agreement or
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     may not distribute the Library at all.  For example, if a patent
     license would not permit royalty-free redistribution of the Library by
     all those who receive copies directly or indirectly through you, then
     the only way you could satisfy both it and this License would be to
     refrain entirely from distribution of the Library.

     If any portion of this section is held invalid or unenforceable under any
     particular circumstance, the balance of the section is intended to apply,
     and the section as a whole is intended to apply in other circumstances.

     It is not the purpose of this section to induce you to infringe any
     patents or other property right claims or to contest validity of any
     such claims; this section has the sole purpose of protecting the
     integrity of the free software distribution system which is
     implemented by public license practices.  Many people have made
     generous contributions to the wide range of software distributed
     through that system in reliance on consistent application of that
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     to distribute software through any other system and a licensee cannot
     impose that choice.

     This section is intended to make thoroughly clear what is believed to
     be a consequence of the rest of this License.

       12. If the distribution and/or use of the Library is restricted in
     certain countries either by patents or by copyrighted interfaces, the
     original copyright holder who places the Library under this License may add
     an explicit geographical distribution limitation excluding those countries,
     so that distribution is permitted only in or among countries not thus
     excluded.  In such case, this License incorporates the limitation as if
     written in the body of this License.

       13. The Free Software Foundation may publish revised and/or new
     versions of the Lesser General Public License from time to time.
     Such new versions will be similar in spirit to the present version,
     but may differ in detail to address new problems or concerns.

     Each version is given a distinguishing version number.  If the Library
     specifies a version number of this License which applies to it and
     &quot;any later version&quot;, you have the option of following the terms and
     conditions either of that version or of any later version published by
     the Free Software Foundation.  If the Library does not specify a
     license version number, you may choose any version ever published by
     the Free Software Foundation.

       14. If you wish to incorporate parts of the Library into other free
     programs whose distribution conditions are incompatible with these,
     write to the author to ask for permission.  For software which is
     copyrighted by the Free Software Foundation, write to the Free
     Software Foundation; we sometimes make exceptions for this.  Our
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                                 NO WARRANTY

       15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
     WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
     EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
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     LIBRARY IS WITH YOU.  SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
     THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

       16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
     WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
     AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
     FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
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     LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
     RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
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                          END OF TERMS AND CONDITIONS

                How to Apply These Terms to Your New Libraries

       If you develop a new library, and you want it to be of the greatest
     possible use to the public, we recommend making it free software that
     everyone can redistribute and change.  You can do so by permitting
     redistribution under these terms (or, alternatively, under the terms of the
     ordinary General Public License).

       To apply these terms, attach the following notices to the library.  It is
     safest to attach them to the start of each source file to most effectively
     convey the exclusion of warranty; and each file should have at least the
     &quot;copyright&quot; line and a pointer to where the full notice is found.

         &lt;one line to give the library&#x27;s name and a brief idea of what it does.&gt;
         Copyright (C) &lt;year&gt;  &lt;name of author&gt;

         This library is free software; you can redistribute it and/or
         modify it under the terms of the GNU Lesser General Public
         License as published by the Free Software Foundation; either
         version 2.1 of the License, or (at your option) any later version.

         This library is distributed in the hope that it will be useful,
         but WITHOUT ANY WARRANTY; without even the implied warranty of
         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
         Lesser General Public License for more details.

         You should have received a copy of the GNU Lesser General Public
         License along with this library; if not, write to the Free Software
         Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

     Also add information on how to contact you by electronic and paper mail.

     You should also get your employer (if you work as a programmer) or your
     school, if any, to sign a &quot;copyright disclaimer&quot; for the library, if
     necessary.  Here is a sample; alter the names:

       Yoyodyne, Inc., hereby disclaims all copyright interest in the
       library `Frob&#x27; (a library for tweaking knobs) written by James Random Hacker.

       &lt;signature of Ty Coon&gt;, 1 April 1990
       Ty Coon, President of Vice

     That&#x27;s all there is to it!