e265c07547
Dear diary, today I fixed a shitty bug that was all my fault because I made a horrible mess. (Except it was a horrible mess before I even touched this shit, but let's not blame others.) Sometimes, updates to VO option that control video sizing (like panscan) didn't update the screen correctly. They were delayed until the next option change or so. It turns out that if the option update happens at the "same" time as a VOCTRL, update_opts() doesn't actually notify the vo_driver of the change. This in turn happened because run_control() called m_config_cache_update(). The latter function returns true if the options changed since the last call, and update_opts() also calls it (on the same config cache) for the same purpose. The update_opts() call, which is triggered by a third mechanism, comes later, but the cache update call will return false (as it should). Basically, given the config API, you can't act differently on multiple update calls and expect it to work. The skipped handling in update_opts() meant that the notification required to apply the changed option wasn't run. Fix this by simply calling update_opts() directly instead. Now there's only 1 m_config_cache_update() call on this specific instance. Fix the call in run_reconfig() too, so the previous sentence isn't a lie (but it probably doesn't make a difference in practice due to certain details). I'm not sure how I even ran into this sort-of race condition. The VOCTRL that messed up the option update was VOCTRL_UPDATE_PLAYBACK_STATE, which happens semi-regularly. Why this config cache shit and all the other shit? Rediscovering this crap wasn't pleasant. It's a bunch of hacks that became necessary when the ancient MPlayer architecture made it hard to move the VO to a separate thread. All the VO code typically accesses vo->opts (whose fields all used to be global variables in MPlayer). The frontend changes these on user input. Putting locking around all the options would be a nightmare, and keeping a copy of the options in the thread was much simpler. You need a way to propagate option changes, notify the thread, and update the local copy too. And the result of these thoughts was the config cache mechanism. In this specific case, the relevant cache update call in update_opts() triggers a VOCTRL_SET_PANSCAN to the VO driver, which isn't related to its former function anymore. Instead, it causes the VO driver to update the video sizing/placing options, which the generic VO code can't do. (Mostly because the VO driver includes the windowing stuff and is responsible for resizing etc. itself.) VOCTRLs sent by the frontend are even worse. MPlayer had no real runtime option change mechanism. Some options were vaguely duplicated by properties, so you could effectively change those options at runtime. Each of these options had its own VOCTRL, which still exist today, e.g. VOCTRL_FULLSCREEN, or VOCTRL_ONTOP. I tried to make all options runtime changeable, and to unify properties with options. But I couldn't be bothered with updating all VO drivers to listen to option changes directly, because that would be pretty tedious. So the property code is still all there and sends the old VOCTRLs. But of course you need to sync up the options, which is why the run_control() code did that. (Unrelated: VO_EVENT_FULLSCREEN_STATE is the worst shithack of them all. Currently, only the frontend can actually write to options (for awful reasons), so if the fullscreen state changes due to outside interaction, the VO driver can't update the corresponding option fields. So the VO notifies the frontend with said VO_EVENT_, and the frontend then sends VOCTRL_GET_FULLSCREEN, and updates the global copy of the option with the value returned by that. I still like to think the situation is not that bad considering the monstrous effort of converting single-threaded code that had hundreds of options in global variables to multi-threaded code with no global variables at all.) |
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| TOOLS | ||
| audio | ||
| ci | ||
| common | ||
| demux | ||
| etc | ||
| filters | ||
| input | ||
| libmpv | ||
| misc | ||
| options | ||
| osdep | ||
| player | ||
| stream | ||
| sub | ||
| ta | ||
| test | ||
| video | ||
| waftools | ||
| .gitignore | ||
| .travis.yml | ||
| Copyright | ||
| LICENSE.GPL | ||
| LICENSE.LGPL | ||
| README.md | ||
| RELEASE_NOTES | ||
| VERSION | ||
| appveyor.yml | ||
| bootstrap.py | ||
| mpv_talloc.h | ||
| version.sh | ||
| wscript | ||
| wscript_build.py | ||
README.md
mpv
- External links
- Overview
- System requirements
- Downloads
- Changelog
- Compilation
- FFmpeg vs. Libav
- FFmpeg ABI compatibility
- Release cycle
- Bug reports
- Contributing
- Relation to MPlayer and mplayer2
- License
- Contact
External links
Overview
mpv is a media player based on MPlayer and mplayer2. It supports a wide variety of video file formats, audio and video codecs, and subtitle types.
Releases can be found on the release list.
System requirements
- A not too ancient Linux, Windows 7 or later, or OSX 10.8 or later.
- A somewhat capable CPU. Hardware decoding might help if the CPU is too slow to
decode video in realtime, but must be explicitly enabled with the
--hwdecoption. - A not too crappy GPU. mpv is not intended to be used with bad GPUs. There are
many caveats with drivers or system compositors causing tearing, stutter,
etc. On Windows, you might want to make sure the graphics drivers are
current. In some cases, ancient fallback video output methods can help
(such as
--vo=xvon Linux), but this use is not recommended or supported.
Downloads
For semi-official builds and third-party packages please see mpv.io/installation.
Changelog
There is no complete changelog; however, changes to the player core interface are listed in the interface changelog.
Changes to the C API are documented in the client API changelog.
The release list has a summary of most of the important changes on every release.
Changes to the default key bindings are indicated in restore-old-bindings.conf.
Compilation
Compiling with full features requires development files for several external libraries. Below is a list of some important requirements.
The mpv build system uses waf, but we don't store it in the
repository. The ./bootstrap.py script will download the latest version
of waf that was tested with the build system.
For a list of the available build options use ./waf configure --help. If
you think you have support for some feature installed but configure fails to
detect it, the file build/config.log may contain information about the
reasons for the failure.
NOTE: To avoid cluttering the output with unreadable spam, --help only shows
one of the two switches for each option. If the option is autodetected by
default, the --disable-*** switch is printed; if the option is disabled by
default, the --enable-*** switch is printed. Either way, you can use
--enable-*** or --disable-** regardless of what is printed by --help.
To build the software you can use ./waf build: the result of the compilation
will be located in build/mpv. You can use ./waf install to install mpv
to the prefix after it is compiled.
Example:
./bootstrap.py
./waf configure
./waf
./waf install
Essential dependencies (incomplete list):
- gcc or clang
- X development headers (xlib, xrandr, xext, xscrnsaver, xinerama, libvdpau, libGL, GLX, EGL, xv, ...)
- Audio output development headers (libasound/ALSA, pulseaudio)
- FFmpeg libraries (libavutil libavcodec libavformat libswscale libavfilter and either libswresample or libavresample)
- zlib
- iconv (normally provided by the system libc)
- libass (OSD, OSC, text subtitles)
- Lua (optional, required for the OSC pseudo-GUI and youtube-dl integration)
- libjpeg (optional, used for screenshots only)
- uchardet (optional, for subtitle charset detection)
- vdpau and vaapi libraries for hardware decoding on Linux (optional)
Libass dependencies:
- gcc or clang, yasm on x86 and x86_64
- fribidi, freetype, fontconfig development headers (for libass)
- harfbuzz (optional, required for correct rendering of combining characters, particularly for correct rendering of non-English text on OSX, and Arabic/Indic scripts on any platform)
FFmpeg dependencies:
- gcc or clang, yasm on x86 and x86_64
- OpenSSL or GnuTLS (have to be explicitly enabled when compiling FFmpeg)
- libx264/libmp3lame/libfdk-aac if you want to use encoding (have to be explicitly enabled when compiling FFmpeg)
- For native DASH playback, FFmpeg needs to be built with --enable-libxml2 (although there are security implications).
- For good nvidia support on Linux, make sure nv-codec-headers is installed and can be found by configure.
- Libav support is broken. (See section below.)
Most of the above libraries are available in suitable versions on normal Linux distributions. For ease of compiling the latest git master of everything, you may wish to use the separately available build wrapper (mpv-build) which first compiles FFmpeg libraries and libass, and then compiles the player statically linked against those.
If you want to build a Windows binary, you either have to use MSYS2 and MinGW, or cross-compile from Linux with MinGW. See Windows compilation.
FFmpeg vs. Libav
Generally, mpv should work with the latest release as well as the git version of FFmpeg. Libav support is currently broken, because they did not add certain FFmpeg API changes which mpv relies on.
FFmpeg ABI compatibility
mpv does not support linking against FFmpeg versions it was not built with, even if the linked version is supposedly ABI-compatible with the version it was compiled against. Expect malfunctions, crashes, and security issues if you do it anyway.
The reason for not supporting this is because it creates far too much complexity with little to no benefit, coupled with absurd and unusable FFmpeg API artifacts.
Newer mpv versions will refuse to start if runtime and compile time FFmpeg library versions mismatch.
Release cycle
Every other month, an arbitrary git snapshot is made, and is assigned a 0.X.0 version number. No further maintenance is done.
The goal of releases is to make Linux distributions happy. Linux distributions are also expected to apply their own patches in case of bugs and security issues.
Releases other than the latest release are unsupported and unmaintained.
See the release policy document for more information.
Bug reports
Please use the issue tracker provided by GitHub to send us bug reports or feature requests. Follow the template's instructions or the issue will likely be ignored or closed as invalid.
Using the bug tracker as place for simple questions is fine but IRC is recommended (see Contact below).
Contributing
Please read contribute.md.
For small changes you can just send us pull requests through GitHub. For bigger changes come and talk to us on IRC before you start working on them. It will make code review easier for both parties later on.
You can check the wiki or the issue tracker for ideas on what you could contribute with.
Relation to MPlayer and mplayer2
mpv is a fork of MPlayer. Much has changed, and in general, mpv should be considered a completely new program, rather than a MPlayer drop-in replacement.
For details see FAQ entry.
If you are wondering what's different from mplayer2 and MPlayer, an incomplete and largely unmaintained list of changes is located here.
License
GPLv2 "or later" by default, LGPLv2.1 "or later" with --enable-lgpl.
See details.
Contact
Most activity happens on the IRC channel and the github issue tracker.
- GitHub issue tracker: issue tracker (report bugs here)
- User IRC Channel:
#mpvonirc.freenode.net - Developer IRC Channel:
#mpv-develonirc.freenode.net