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The MagicYUV format stores Huffman tables in its bitstream by coding the length of a given symbol; it does not code the actual code directly, instead this is to be inferred by the rule that a symbol is to the left of every shorter symbol in the Huffman tree and that for symbols of the same length the symbol is ascending from left to right. With one exception, this is also what our decoder did. The exception only matters when there are codes of length 32, because in this case the first symbol of this length did not get the code 0, but 1; e.g. if there were exactly two nodes of length 32, then they would get assigned the codes 1 and 2 and a node of length 31 will get the 31-bit code 1 which is a prefix of the 32 bit code 2, making the Huffman table invalid. On the other hand, if there were only one symbol with the length 32, the earlier code would accept this un-Huffman-tree. Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
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 a mean to alter decoded Audio and Video through chain of 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.