c07de58a72
checkasm benchmarks on 1.5 GHz Cortex-A72 are as follows. Note that the C version can still outperform the NEON version in specific cases. The balance between different code paths is stream-dependent, but in practice the best case happens about 5% of the time, the worst case happens about 40% of the time, and the complexity of the remaining cases fall somewhere in between. Therefore, taking the average of the best and worst case timings is probably a conservative estimate of the degree by which the NEON code improves performance. vc1dsp.vc1_h_loop_filter4_bestcase_c: 19.0 vc1dsp.vc1_h_loop_filter4_bestcase_neon: 48.5 vc1dsp.vc1_h_loop_filter4_worstcase_c: 144.7 vc1dsp.vc1_h_loop_filter4_worstcase_neon: 76.2 vc1dsp.vc1_h_loop_filter8_bestcase_c: 41.0 vc1dsp.vc1_h_loop_filter8_bestcase_neon: 75.0 vc1dsp.vc1_h_loop_filter8_worstcase_c: 294.0 vc1dsp.vc1_h_loop_filter8_worstcase_neon: 102.7 vc1dsp.vc1_h_loop_filter16_bestcase_c: 54.7 vc1dsp.vc1_h_loop_filter16_bestcase_neon: 130.0 vc1dsp.vc1_h_loop_filter16_worstcase_c: 569.7 vc1dsp.vc1_h_loop_filter16_worstcase_neon: 186.7 vc1dsp.vc1_v_loop_filter4_bestcase_c: 20.2 vc1dsp.vc1_v_loop_filter4_bestcase_neon: 47.2 vc1dsp.vc1_v_loop_filter4_worstcase_c: 164.2 vc1dsp.vc1_v_loop_filter4_worstcase_neon: 68.5 vc1dsp.vc1_v_loop_filter8_bestcase_c: 43.5 vc1dsp.vc1_v_loop_filter8_bestcase_neon: 55.2 vc1dsp.vc1_v_loop_filter8_worstcase_c: 316.2 vc1dsp.vc1_v_loop_filter8_worstcase_neon: 72.7 vc1dsp.vc1_v_loop_filter16_bestcase_c: 62.2 vc1dsp.vc1_v_loop_filter16_bestcase_neon: 103.7 vc1dsp.vc1_v_loop_filter16_worstcase_c: 646.5 vc1dsp.vc1_v_loop_filter16_worstcase_neon: 110.7 Signed-off-by: Ben Avison <bavison@riscosopen.org> 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.