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Up until now, using NULL as key in av_dict_get() on a non-empty AVDictionary would crash; using NULL as key in av_dict_set() would also crash for a non-empty AVDictionary unless AV_DICT_MULTIKEY was set; in case the dictionary was initially empty or AV_DICT_MULTIKEY was set, it was even possible for av_dict_set() to succeed when adding a NULL key, namely when one uses a value != NULL and the AV_DICT_DONT_STRDUP_VAL flag. Using av_dict_get() on such an AVDictionary will usually lead to crashes, though. Fix this by actually checking for key in both functions; error out if they are NULL. While just at it, also stop relying on av_strdup(NULL) to return NULL in av_dict_set(). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.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.