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Lynne
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The context base of each chunk of 32 samples is built from inputs 1, 2 and 4 of the quant table, which every invocation read from the uniform buffer. When the slice starts, those inputs of the tables of the first plane and of the chroma planes are now copied to shared memory as int16, and the chunks read them from there. At 3 KiB, the copy leaves enough shared memory for every slice of a frame to stay resident. Any other plane reads the uniform buffer as before. Decoding a 6464x4852 16-bit RGB frame with 1024 slices on an RX 6900 XT, with the bitstream in VRAM, goes from 50.7/40.6/39.1 ms to 50.3/40.1/38.7 ms with context model 1/0/2. It was 177.1/146.6/142.9 ms before this series.
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.