No description
75ba2bf457
Instead of using a "precise" division, simulate the actual truncation.
Note that the division by `den` is unneeded in principle because the
denominator *should* always be 1 for an integer, but this way we don't
explode if the user should happen to pass `4/2` or something.
Fixes a lot of unnecessary clamps w.r.t. xv36, e.g.:
xv36be -> yuv444p12be:
[u16 XXXX -> ++++] SWS_OP_READ : 4 elem(s) packed >> 0
[u16 ...X -> ++++] SWS_OP_SWAP_BYTES
[u16 ...X -> ++++] SWS_OP_SWIZZLE : 1023
[u16 ...X -> ++++] SWS_OP_RSHIFT : >> 4
- [u16 ...X -> ++++] SWS_OP_CONVERT : u16 -> f32
- [f32 ...X -> ++++] SWS_OP_MIN : x <= {4095 4095 4095 _}
- [f32 ...X -> ++++] SWS_OP_CONVERT : f32 -> u16
[u16 ...X -> ++++] SWS_OP_SWAP_BYTES
[u16 ...X -> ++++] SWS_OP_WRITE : 3 elem(s) planar >> 0
(X = unused, + = exact, 0 = zero)
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| .forgejo | ||
| compat | ||
| doc | ||
| ffbuild | ||
| fftools | ||
| libavcodec | ||
| libavdevice | ||
| libavfilter | ||
| libavformat | ||
| libavutil | ||
| libswresample | ||
| libswscale | ||
| presets | ||
| tests | ||
| tools | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| Changelog | ||
| configure | ||
| CONTRIBUTING.md | ||
| COPYING.GPLv2 | ||
| COPYING.GPLv3 | ||
| COPYING.LGPLv2.1 | ||
| COPYING.LGPLv3 | ||
| CREDITS | ||
| FUNDING.json | ||
| INSTALL.md | ||
| LICENSE.md | ||
| MAINTAINERS | ||
| Makefile | ||
| README.md | ||
| RELEASE | ||
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.