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av_fast_realloc and av_fast_mallocz? store the size of the objects they allocate in an unsigned. Yet they overallocate and currently they can allocate more than UINT_MAX bytes in case a user has requested a size of about UINT_MAX * 16 / 17 or more if SIZE_MAX > UINT_MAX (and if the user increased max_alloc_size via av_max_alloc). In this case it is impossible to store the true size of the buffer via the unsigned*; future requests are likely to use the (re)allocation codepath even if the buffer is actually large enough because of the incorrect size. Fix this by ensuring that the actually allocated size always fits into an unsigned. (This entails erroring out in case the user requested more than UINT_MAX.) Reviewed-by: Tomas Härdin <tjoppen@acc.umu.se> Reviewed-by: Anton Khirnov <anton@khirnov.net> 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.