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Recent versions of macOS provide more POSIX API (in particular, clock_gettime) than previous versions and recent Apple toolchains provide all that API, even when targeting older releases without said API. Disallow linking to functions which might not be available at runtime. To actually have an effect, either add --extra-cflags="-mmacosx-version-min=10.11" (or any other version prior to 10.12) or set MACOSX_DEPLOYMENT_TARGET=10.11 when running configure. As a workaround for libav versions without this fix, one can also add --extra-cflags="-mmacosx-version-min=10.11 -Werror=partial-availability" while running configure. The -no_weak_imports flag is new in Xcode 8; in Xcode 7 it is not supported. This is not an issue since Xcode 7 only ships with the 10.11 macOS SDK, which lacks clock_gettime. Bug-Id: 1033 CC: libav-stable@libav.org Signed-off-by: Martin Storsjö <martin@martin.st>
Libav
Libav 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 a mean to alter decoded Audio and Video through chain of filters.libavdeviceprovides an abstraction to access capture and playback devices.libavresampleimplements audio mixing and resampling routines.libswscaleimplements color conversion and scaling routines.
Tools
- avconv is a command line toolbox to manipulate, convert and stream multimedia content.
- avplay is a minimalistic multimedia player.
- avprobe is a simple analisys 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
Conding examples are available in the doc/example directory.
License
Libav codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.