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Martin Storsjö
d4e5c08e18
We use a dummy aarch64 feature to work around an issue in older Clang, where an .arch line such as ".arch armv8.2-a" doesn't take effect immediately, while one like ".arch armv8.2-a+feature" works. Previously, we used "crc" for this dummy feature to add (as an old feature that would be supported widely by old toolchains). But as we may want to actually use crc features and detect whether they are supported, we may want to switch to another feature. Use the "fp" feature instead, for the purposes of this extra feature in the .arch lines. (The "fp" feature indicates floating point support, which is implicitly part of the baseline feature set anyway.)
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.