6e42021128
The lensfun filter wraps the lensfun library which performs transformations on videos to correct for lens distortion. Often this results in areas in the input being mapped to areas that fall outside the boundaries of the output. The library has a parameter called scale which is a scale factor applied to the output video. By decreasing it it is possible to regain the areas of the video which would otherwise have been lost. There is a special value of 0 which indicates that the library should automatically determine a scale factor that results in the output frame being filled (i.e. little or no black/unmapped areas). This patch adds a corresponding scale option to the lensfun filter which is passed through to the library. The existing behaviour of using the automatic value of 0 is retained as the default behaviour, while other values will be passed through to the library. Signed-off-by: Daniel Playfair Cal <daniel.playfair.cal@gmail.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 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 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.