mirror of https://git.ffmpeg.org/ffmpeg.git
9c341c6c92
apng data consists of parts containing a small header (including a four-byte size field) and a data part; the size field does not account for everything and is actually twelve bytes short of the actual size. In order to make sure that the size fits into an int, the size field is checked for being > INT_MAX; yet this does not account for the + 12 and upon conversion to int (which happens when calling append_extradata()), the size parameter can still wrap around. In this case the currently used check would lead to undefined signed integer overflow. Furthermore, append_extradata() appends the new data to the already existing extradata and therefore needs to make sure that the combined size of new and old data as well as padding fits into an int. The check used for this is "if (old_size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE - new_size)". If new_size is > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE the right side becomes negative if the types are signed (as they are now); yet changing this to "if (new_size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE - old_size)" is better as this also works for unsigned types (where it is of course presumed that INT_MAX is replaced by the corresponding maximum for the new type). Both of these issues have been fixed. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> |
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| compat | ||
| doc | ||
| ffbuild | ||
| fftools | ||
| libavcodec | ||
| libavdevice | ||
| libavfilter | ||
| libavformat | ||
| libavresample | ||
| libavutil | ||
| libpostproc | ||
| libswresample | ||
| libswscale | ||
| presets | ||
| tests | ||
| tools | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .travis.yml | ||
| CONTRIBUTING.md | ||
| COPYING.GPLv2 | ||
| COPYING.GPLv3 | ||
| COPYING.LGPLv2.1 | ||
| COPYING.LGPLv3 | ||
| CREDITS | ||
| Changelog | ||
| INSTALL.md | ||
| LICENSE.md | ||
| MAINTAINERS | ||
| Makefile | ||
| README.md | ||
| RELEASE | ||
| configure | ||
README.md
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.