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In some MSYS environments it can happen that the 3 argument syntax for pkg-config library specifications fails because somehow the expansion of pkg_version ends up with a redirection we guess. To avoid failures like in the referenced build[2], we quote it so the whole module including operators will be expanded into a single shell word and the single argument syntax for specifying the library for pkg-config will be used. The single argument syntax seems to be supported by the original pkg-config from the beginning more than 20 years[3]. In the pkgconf implementation single argument syntax was supported pretty much from the beginning as well. The multiple argument syntax we used until this change, was not supported until a change[4] more than 10 years ago. References ---------- 1. Build passing with quotes: https://github.com/JoeSchiff/pyav-ffmpeg/actions/runs/12358403929 2. Build failing without quotes: https://github.com/JoeSchiff/pyav-ffmpeg/actions/runs/12360472377 3. Earliest commit of the current pkg-config Git repo already mentions the single argument syntax:2ac96cbcc7 (124c0becfe68b1ef671f49ed2b9d24779ace126f_0_162)4. pkgconf gets support for 3 argument syntax (pkgconf --exists liba = 1.2.3):793de6a06cCommit-message-by: Alexander Strasser <eclipse7@gmx.net> Signed-off-by: Joe Schiffler <joeschiffler3@gmail.com> Signed-off-by: Alexander Strasser <eclipse7@gmx.net>
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.