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Since psadbw only exists for 8-bits, we have to emulate it for 16-bit inputs. The simplest sequence is to use a normal subtraction, which is safe as long as the inputs do not exceed 32767 - so limit this implementation to 15-bit inputs and below. For 16-bit inputs, we could in theory instead use a pminw / pmaxw to ensure the resulting difference does not overflow, but this is slower, and also breaks the subsequent use of pmaddwd, so I opted to skip 16-bit SIMD for now. scene_sad10_c: 114175.6 ( 1.00x) scene_sad10_avx2: 9617.7 (11.87x) scene_sad10_avx512: 5208.8 (21.92x) scene_sad12_c: 114537.8 ( 1.00x) scene_sad12_avx2: 9614.0 (11.91x) scene_sad12_avx512: 5186.3 (22.08x) scene_sad14_c: 114113.9 ( 1.00x) scene_sad14_avx2: 9612.9 (11.87x) scene_sad14_avx512: 5186.0 (22.00x) scene_sad15_c: 114108.9 ( 1.00x) scene_sad15_avx2: 9612.3 (11.87x) scene_sad15_avx512: 5186.4 (22.00x) scene_sad16_c: 114136.0 ( 1.00x)
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.