4b93166add
A Seek element in a Matroska SeekHead should contain a SeekID and a SeekPosition element and upon reading, they should be sanitized: Given that IDs are restricted to 32 bit, longer SeekIDs should be treated as invalid. Instead currently the lower 32 bits have been used. For SeekPosition, no checks were performed for the element to be present and if present, whether it was excessively large (i.e. the absolute file position described by it exceeding INT64_MAX). The SeekPosition element had a default value of -1 which means that a check seems to have been intended; but it was not implemented. This commit adds a check for overflow to the calculation of the absolute file position of the referenced level 1 elements. Using -1 (i.e. UINT64_MAX) as default value for SeekPosition implies that a Seek element without SeekPosition will run afoul of this check. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> (cherry picked from commit 7c243eece3427bc5a6d54657d488d5c0c2985a8e)
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.
- 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.