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Andreas Rheinhardt a78173374a ffbuild/common: Fix CPPFLAGS applied for compiling C++ files 
Currently, $(CPPFLAGS) and $(CFLAGS) are prepended to CXXFLAGS
(the flags for compiling C++) like this:
CXXFLAGS := $(CPPFLAGS) $(CFLAGS) $(CXXFLAGS)
Using ":=" creates a simply expanded variable, i.e. the values
of the variable at the time of assignment are used and later
modifications to them are ignored (using a recursively expanding
variable (i.e. "=" instead of ":=") is not really possible here,
as there would be an infinite loop when evaluating CXXFLAGS).

Yet we perform later additions to CPPFLAGS: HAVE_AV_CONFIG_H and
BUILDING_libfoo are defined. These do not reach C++ compilations.

To fix this a trick is employed to prepend to a recursively
expanded variable while keeping it recursively expanded.

There are two practical consequences of this: C++ files now no longer
include the version.h header, but only the version_major.h header
of their library, saving some recompilations. Furthermore, they
now get some optimized math functions (namely the ones from
lavu/intmath.h instead of the ones from lavu/common.h).
(av_parity() is the only one for which it makes a difference.)

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-05-24 21:30:52 +02:00
compat Replace all occurences of av_mallocz_array() by av_calloc() 2021-09-20 01:03:52 +02:00
doc avfilter: Add blockdetect filter 2022-05-24 11:21:36 +02:00
ffbuild ffbuild/common: Fix CPPFLAGS applied for compiling C++ files 2022-05-24 21:30:52 +02:00
fftools fftools/ffmpeg: move processing AV_PKT_DATA_QUALITY_STATS to do_video_stats() 2022-05-24 13:46:57 +02:00
libavcodec avcodec/libdavs2: export has_b_frames info 2022-05-24 18:03:12 +08:00
libavdevice avdevice/dshow: reuse unused variables. 2022-05-12 22:06:44 -03:00
libavfilter lavfi/vf_v360: implement output mask for barrelsplit 2022-05-24 13:41:24 +02:00
libavformat Switch uses of av_fopen_utf8 to avpriv_fopen_utf8 2022-05-23 13:52:45 +03:00
libavutil libavutil: Deprecate av_fopen_utf8, provide an avpriv version 2022-05-23 13:52:26 +03:00
libpostproc lib*/version: Move library version functions into files of their own 2022-05-10 06:49:32 +02:00
libswresample lib*/version: Move library version functions into files of their own 2022-05-10 06:49:32 +02:00
libswscale lib*/version: Move library version functions into files of their own 2022-05-10 06:49:32 +02:00
presets
tests tests/fate/vcodec: add tests for ffv1 2pass mode 2022-05-24 13:35:16 +02:00
tools avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 2022-03-21 01:33:09 +01:00
.gitattributes
.gitignore gitignore: add config_components.h 2022-03-17 18:35:41 -03:00
.mailmap mailmap: add entry for myself 2021-03-09 02:09:55 +00:00
.travis.yml Merge commit '899ee03088' 2019-03-14 15:53:16 -03:00
Changelog avfilter: Add blockdetect filter 2022-05-24 11:21:36 +02:00
configure avformat/movenc: Add support for AVIF muxing 2022-05-13 12:46:21 +05:30
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md
LICENSE.md avfilter/vf_geq: Relicense to LGPL 2019-12-28 11:20:48 +01:00
MAINTAINERS avformat/image2: add Jpeg XL as image2 format 2022-04-23 19:51:46 +02:00
Makefile lib*/version: Move library version functions into files of their own 2022-05-10 06:49:32 +02:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
RELEASE Bump Versions before release/4.4 branch 2021-03-20 01:01:12 +01:00

README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides means to alter decoded audio and video through a directed graph of connected filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements 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, ismindex and qt-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.