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I also tried replacing some of the instructions by more elaborate ones using masks, but I found no performance gain significant enough to be worth maintaining two code paths, so this implementation merely replaces the AVX2 implementation by drop-in AVX512 equivalents. bwdif8_c: 6362.2 ( 1.00x) bwdif8_sse2: 1004.9 ( 6.33x) bwdif8_ssse3: 946.0 ( 6.73x) bwdif8_avx2: 477.9 (13.31x) bwdif8_avx512: 273.3 (23.28x) bwdif10_c: 6341.5 ( 1.00x) bwdif10_sse2: 872.4 ( 7.27x) bwdif10_ssse3: 803.4 ( 7.89x) bwdif10_avx2: 416.7 (15.22x) bwdif10_avx512: 224.3 (28.27x) Realtime test at 3840x2160 yuv420p: avx2: frame=20000 fps=3370 q=-0.0 Lsize=N/A time=00:06:40.00 bitrate=N/A speed=67.4x elapsed=0:00:05.93 avx512: frame=20000 fps=5077 q=-0.0 Lsize=N/A time=00:06:40.00 bitrate=N/A speed= 102x elapsed=0:00:03.93 The use of this function is gated behind avx512icl so that it doesn't downclock on Skylake.
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.