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It's a minor improvement that shaves off 5-8% from the execution time. Instead of shifting by 2 right away and by 7 soon after, shift by 9 one time. Times before and after: A78: rgb24toyv12_16_200_neon: 5366.8 ( 3.62x) rgb24toyv12_128_60_neon: 13574.0 ( 3.34x) rgb24toyv12_512_16_neon: 14463.8 ( 3.33x) rgb24toyv12_1920_4_neon: 13508.2 ( 3.34x) rgb24toyv12_1920_4_negstride_neon: 13525.0 ( 3.34x) rgb24toyv12_16_200_neon: 5293.8 ( 3.66x) rgb24toyv12_128_60_neon: 12955.0 ( 3.50x) rgb24toyv12_512_16_neon: 13784.0 ( 3.50x) rgb24toyv12_1920_4_neon: 12900.8 ( 3.49x) rgb24toyv12_1920_4_negstride_neon: 12902.8 ( 3.49x) A72: rgb24toyv12_16_200_neon: 9695.8 ( 2.50x) rgb24toyv12_128_60_neon: 20286.6 ( 2.70x) rgb24toyv12_512_16_neon: 22276.6 ( 2.57x) rgb24toyv12_1920_4_neon: 19154.1 ( 2.77x) rgb24toyv12_1920_4_negstride_neon: 19055.1 ( 2.78x) rgb24toyv12_16_200_neon: 9214.8 ( 2.65x) rgb24toyv12_128_60_neon: 20731.5 ( 2.65x) rgb24toyv12_512_16_neon: 21145.0 ( 2.70x) rgb24toyv12_1920_4_neon: 17586.5 ( 2.99x) rgb24toyv12_1920_4_negstride_neon: 17571.0 ( 2.98x) A53: rgb24toyv12_16_200_neon: 12880.4 ( 3.76x) rgb24toyv12_128_60_neon: 27776.3 ( 3.94x) rgb24toyv12_512_16_neon: 29411.3 ( 3.94x) rgb24toyv12_1920_4_neon: 27253.1 ( 3.98x) rgb24toyv12_1920_4_negstride_neon: 27474.3 ( 3.95x) rgb24toyv12_16_200_neon: 12196.3 ( 3.95x) rgb24toyv12_128_60_neon: 26943.1 ( 4.07x) rgb24toyv12_512_16_neon: 28642.3 ( 4.07x) rgb24toyv12_1920_4_neon: 26676.6 ( 4.08x) rgb24toyv12_1920_4_negstride_neon: 26713.8 ( 4.07x) Signed-off-by: Martin Storsjö <martin@martin.st>
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.