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mpv is a fork of mplayer2, which is a fork of MPlayer.
mpv as a whole is licensed as GPL version 2 or later (see LICENSE). Most source
files are GPLv2+, but some files are available under a more liberal license,
such as LGPLv2.1+, BSD, MIT, ISC, and possibly others. Look at the copyright
header of each source file, and grep the sources for "Copyright" if you need
to know details. C source files without Copyright notice are licensed as
LGPLv2.1+. Also see the list of files with specific licenses below (not all
files can have a standard license header).
All new contributions must be LGPLv2.1+ licensed, or if the changes are done on
GPL code, must come with the implicit agreement that the project can relicense
the code to LGPLv2.1+ at a later point without asking the contributor. (This
is a safeguard for making potential relicensing of remaining code to LGPLv2.1+
easier.) Using a more liberal license compatible to LGPLv2.1+ is also ok.
For information about authors and contributors, consult the git log, which
contains the complete SVN and CVS history as well.
Note that mplayer2 as a whole is licensed under GPLv3+. This is because it uses
a copy of talloc (part of Samba), which is LGPLv3+, and the next compatible
license for this mix is GPLv3+.
MPlayer as a whole is licensed under GPLv2 (incompatible to GPLv3!), because
some files are licensed to GPLv2 (and _not_ any later version of the license).
In particular, this affects the file libmpdemux/demux_ty_osd.c. It is disabled
under mplayer2, and has been removed from mpv.
"v2.1+" in this context means "version 2.1 or later".
Some libraries are GPLv2+ or GPLv3+ only. Building mpv with Samba support makes
it GPLv3+.
mpv can be built as LGPLv2.1+ with the --enable-preliminary-lgpl2 configure
option. This is a very new switch and it hasn't been confirmed yet whether
really all GPL code is excluded (thus preliminary). In addition, it disables
a number of useful features, some of them quite central:
- no audio filtering, which breaks: --volume, --af, replaygain, pitch
correction, fine control about downmix/upmix/resampling behavior
- Linux X11 video output
- Linux audio output via ALSA (PulseAudio works)
- BSD audio output via OSS
- NVIDIA/Linux hardware decoding (vdpau, although CUDA usually works)
- many builtin video filters (use libavfilter instead)
- automatic rotation and stereoscopic video handling
- Linux TV input
- the --frames option
- the add/cycle and sub-add/audio-add/sub-remove/audio-remove commands
- video format conversion (if not supported by the VO)
- minor features: jack, DVD, CDDA, SMB, CACA, legacy direct3d VO
Some of these will be fixed in the future. The lack of the add/cycle commands
makes this particularly useless for CLI mode, and most of the appeal of LGPL
is for libmpv anyway. Thus it's not recommended to build mpv CLI in LGPL mode
at all.
Source files with specific licenses:
- etc/input.conf is LGPLv2.1+
- etc/builtin.conf is LGPLv2.1+
- etc/encoding-profiles.conf is LGPLv2.1+
- all mpv icons and derived files are LGPLv2.1+ (mpv-icon-8bit-16x16.png etc.)
- everything else under etc/ is unknown
- everything under DOCS/man/ is GPLv2+
- sub/osd_font.otf is LGPLv2.1+
- version.sh is LGPLv2+
- bootstrap.py is unknown (probably GPLv2+ or LGPLv2+)
- the build system (wscript, waftools/*) is LGPLv2+, some parts BSD
The following files are still GPL:
audio/filter/* will be replaced with new filter chain
audio/filter/af_format.c mostly LGPL (except af glue code)
audio/filter/af_lavc3enc.c as above
audio/filter/af_lavfi.c as above
audio/filter/af_scaletempo.c as above
audio/filter/af_rubberband.c as above
audio/out/ao_alsa.c chaotic history, original author did not decide
audio/out/ao_jack.c will stay GPL
audio/out/ao_oss.c will stay GPL
audio/audio.* needed by af code only
demux/demux_tv.c will stay GPL
stream/ai_* will stay GPL (TV code)
stream/audio_in.* will stay GPL (TV code)
stream/dvb* must stay GPL
stream/frequencies.* must stay GPL
stream/stream_cdda.c unknown
stream/stream_dvb.* must stay GPL
stream/stream_dvd.c unknown
stream/stream_dvd_common.* unknown
stream/stream_dvdnav.c unknown
stream/stream_smb.c will stay GPLv3
stream/stream_tv.c will stay GPL
stream/tv* will stay GPL
video/filter/vf_crop.c will be deleted
video/filter/vf_dsize.c will be deleted
video/filter/vf_expand.c will be deleted
video/filter/vf_flip.c will be deleted
video/filter/vf_format.c will be deleted
video/filter/vf_gradfun.c will be deleted
video/filter/vf_mirror.c will be deleted
video/filter/vf_noformat.c will be deleted
video/filter/vf_pullup.c will be deleted
video/filter/vf_rotate.c will be deleted
video/filter/vf_scale.c will be deleted
video/filter/vf_stereo3d.c will be deleted
video/filter/vf_sub.c will be deleted
video/filter/vf_yadif.c will be deleted
video/out/opengl/hwdec_vaglx.c GPL
video/out/vo_caca.c unknown
video/out/vo_direct3d.c unknown
video/out/vo_vaapi.c probably impossible (some company's code)
video/out/vo_vdpau.c probably impossible (nVidia's code)
video/out/vo_x11.c probably impossible
video/out/vo_xv.c probably impossible
video/out/x11_common.* probably impossible
video/vdpau.c hard (GPL-only parts must be ifdefed)
video/vdpau.h unknown
video/vdpau_mixer.* actual code must be rewritten
The following files contain some optional GPL code:
input/cmd_list.c potentially some commands
demux/demux_mkv.c some verbose message
options/options.c --frames option
options/parse_commandline.c dvd:// expansion
player/audio.c libaf glue code
player/loadfile.c --frames option (minor but probably fatal)
player/osd.c OSD level 3
player/command.c add/cycle command, possibly sub-add command
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