f5cd00bf52
av_display_rotation_get will return NAN when the display matrix is invalid, which would end up printing NAN as an integer in the rotation field. This is poor for multiple reasons: * Users of ffprobe have no way of discerning "valid but ugly rotation from display matrix" from "invalid display matrix". * It can have unintended consequences on some platforms, such as Linux x86_64, where NAN is equal to INT64_MIN, which, for example, when printed as JSON, which uses floating point for all numbers, can end up as invalid JSON or wit a number that cannot be reserialized as an integer at all. Since NAN is av_display_rotation_get's error case, just print 0 (no rotation) when that happens. Signed-off-by: Derek Buitenhuis <derek.buitenhuis@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.