mirror of
https://mirror.skon.top/https://github.com/FFmpeg/FFmpeg
synced 2026-04-20 21:00:41 +08:00
c0f49db53d
This information is now pre-filled automatically for SWS_OP_READ when
relevant.
yuv444p10msbbe -> rgb24:
[u16 XXXX -> +++X] SWS_OP_READ : 3 elem(s) planar >> 0
[u16 ...X -> +++X] SWS_OP_SWAP_BYTES
[u16 ...X -> +++X] SWS_OP_RSHIFT : >> 6
[u16 ...X -> +++X] SWS_OP_CONVERT : u16 -> f32
[f32 ...X -> ...X] SWS_OP_LINEAR : matrix3+off3 [...]
[f32 ...X -> ...X] SWS_OP_DITHER : 16x16 matrix + {0 3 2 5}
[f32 ...X -> ...X] SWS_OP_MAX : {0 0 0 0} <= x
+ [f32 ...X -> ...X] SWS_OP_MIN : x <= {255 255 255 _}
[f32 ...X -> +++X] SWS_OP_CONVERT : f32 -> u8
[ u8 ...X -> +++X] SWS_OP_WRITE : 3 elem(s) packed >> 0
(X = unused, + = exact, 0 = zero)
(This clamp is needed and was incorrectly optimized away before, because the
`SWS_OP_RSHIFT` incorrectly distorted the value range assertion)
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.