c6a905b91d
The existing logic overrides container metadata even in cases where the container metadata must be trusted (e.g. HDR). The original spec had no provision for specifying color volume, so many files rely on the assumption of Rec. 709. An update to the spec included a 'clv' field for explicitly signaling that the container should be trusted in an existing bitfield in the frame header, but the default of 0 from old encoders forces Rec. 709, which would break any HDR stream. Because there is no place in DNxHR for specifying a transfer function, DNxHR HDR files must include container-level color information. This patch maintains the existing behavior of choosing the 709 over the 601 matrix when container-level information is missing, and allows container-level information to win if present. Signed-off-by: Steven Robertson <steven@strobe.cc> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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.
- ffserver is a multimedia streaming server for live broadcasts.
- 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.