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Implementation copied wholesale from dav1d, sans SIMD, under permissive license. This implementation was extensively verified to be bit-exact, so it serves as a much better starting point than trying to re-engineer this from scratch for no reason. (I also authored the original implementation in dav1d, so any "clean room" implementation would end up looking much the same, anyway) The notable changes I had to make while adapting this from the dav1d code-base to the FFmpeg codebase include: - reordering variable declarations to avoid triggering warnings - replacing several inline helpers by avutil equivalents - changing code that accesses frame metadata - replacing raw plane copying logic by av_image_copy_plane Apart from this, the implementation is basically unmodified.
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.