mirror of
https://mirror.skon.top/https://github.com/FFmpeg/FFmpeg
synced 2026-04-20 21:00:41 +08:00
52ba2ac7bd
This fixes an ABI violation, as mul_thrmat did not issue emms. It seems that this ABI violation could reach the user, namely if ff_get_video_buffer() fails. Notice that ff_get_video_buffer() itself could fail because of this, namely if the allocator uses floating point registers. On x64 (where GCC already used SSE2 in the C version) mul_thrmat_c: 4.4 ( 1.00x) mul_thrmat_mmx: 8.6 ( 0.52x) mul_thrmat_sse2: 4.4 ( 1.00x) On 32bit (where SSE2 is not known to be available): mul_thrmat_c: 56.0 ( 1.00x) mul_thrmat_sse2: 6.0 ( 9.40x) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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.