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This file attempts to define _DEFAULT_SOURCE and similar macros
to affect the system headers regarding what APIs they expose.
However, as this file includes libavutil/error.h before defining
the _*_SOURCE macros, we may end up including system headers that
end up initializing which features are exposed, before we set our
defines (before including <sys/mman.h>).
This is not an issue with glibc 2.37 and newer, since those versions
stopped looking for defines like _DEFAULT_SOURCE for exposing
MAP_ANONYMOUS (see [1]). This wasn't an issue before these functions
were split out to a separate file in
4d9be5f57c either, as these defines
used to be set at the top of libswscale/utils.c, before including other
headers than config.h.
[1] https://sourceware.org/git/?p=glibc.git;a=commit;h=954b8f38958de72c4712088735eb175118f17b51
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides means to alter decoded audio and video through a directed graph of connected filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements color conversion and scaling routines.
Tools
- ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
- ffplay is a minimalistic multimedia player.
- ffprobe is a simple analysis tool to inspect multimedia content.
- Additional small tools such as
aviocat,ismindexandqt-faststart.
Documentation
The offline documentation is available in the doc/ directory.
The online documentation is available in the main website and in the wiki.
Examples
Coding examples are available in the doc/examples directory.
License
FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.
Contributing
Patches should be submitted to the ffmpeg-devel mailing list using
git format-patch or git send-email. Github pull requests should be
avoided because they are not part of our review process and will be ignored.