6f79f0971e
This commit adds both decode and encode support for cICP chunks, which allow a PNG image's pixel data to be tagged by any of the enum values in H.273, without an ICC profile. Upon decode, if a cICP chunk is present, the PNG decoder will tag output AVFrames with the resulting enum color, and ignore iCCP, sRGB, gAMA, and cHRM chunks, as per the spec. Upon encode, if the color space is known and specified, and it is not sRGB, the PNG encoder will output a cICP chunk containing the color space. If the color space is sRGB, then it will output an sRGB chunk instead of a cICP chunk. If the color space of the input is not unspecified, it will not output a cICP chunk tagging the PNG as unspecified. In either the sRGB case or the non-SRGB case, gAMA and cHRM are still written as fallbacks provided the info is known. Signed-off-by: Leo Izen <leo.izen@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 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.