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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. Using a more liberal license
compatible to LGPLv2.1+ is also ok.
If 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
GPL code to LGPLv2.1+ easier.
For information about authors and contributors, consult the git log, which
contains the complete SVN and CVS history as well.
"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-lgpl configure option. To add
a LGPL mode to mpv, MPlayer code had to be relicensed from GPLv2+ to LGPLv2.1+
by asking the MPlayer authors for permission. Since permission could not be
obtained from everyone, LGPL mode disables the following 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.
The following files are still GPL only (--enable-lgpl disables them):
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, one later 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
DOCS/man/ GPLv2+
bootstrap.py unknown license, probably GPLv2+ or LGPLv2+
etc/mplayer-input.conf unknown license, probably GPLv2+
mpv.desktop unknown license, probably GPLv2+
etc/restore-old-bindings.conf unkniwn license, probably GPLv2+
The following files contain some optional GPL code (--enable-lgpl disables it):
input/cmd_list.c potentially some commands
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
None of the exceptions listed above affect the final binary if it's built as
LGPL. Linked libraries still can affect the final license (for example if
FFmpeg was built as GPL).
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