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Christophe Gisquet
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In some cases, 2 or 3 calls are performed to functions for unusual widths. Instead, perform 2 calls for different widths to split the workload. The 8+16 and 4+8 widths for respectively 8 and more than 8 bits can't be processed that way without modifications: some calls use unaligned buffers, and having branches to handle this was resulting in no micro-benchmark benefit. For block_w == 12 (around 1% of the pixels of the sequence): Before: 12758 decicycles in epel_uni, 4093 runs, 3 skips 19389 decicycles in qpel_uni, 8187 runs, 5 skips 22699 decicycles in epel_bi, 32743 runs, 25 skips 34736 decicycles in qpel_bi, 32733 runs, 35 skips After: 11929 decicycles in epel_uni, 4096 runs, 0 skips 18131 decicycles in qpel_uni, 8184 runs, 8 skips 20065 decicycles in epel_bi, 32750 runs, 18 skips 31458 decicycles in qpel_bi, 32753 runs, 15 skips Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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 a mean to alter decoded Audio and Video through chain of 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 analisys 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
Conding examples are available in the doc/example directory.
License
FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.