Andreas Rheinhardt
fcde452a47
RealVideo 4.0 has a VLC that encodes two intra types per code; each intra type is in the range 0..8 (inclusive) and up until now the VLC used symbols in the range 0..80; one type was encoded as the remainder when dividing the symbol by 9 whereas the other type was encoded as symbol / 9. This is suboptimal; a better way would be to use the high and low nibble to encode each symbol. But an even better way is to use 16bit symbols so that the two intra types can be directly written as a 16bit value. This commit implements this; in order to avoid huge tables the symbols are stored as uint8_t with high and low nibbles encoding one type each; they are only unpacked to uint16_t during initialization. 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.