d86f7603cf
Up until now, ff_mpeg_update_thread_context() zeroes the context to initialize on initialization failure. This has been added ine1d7d4bd13. Just as now, ff_mpeg_update_thread_context() simply copied the src MpegEncContext over the dst MpegEncContext to initialize it, but clear_context() was only added inb160fc290c, so that cleaning up on init failure was a minefield if performed. It was not always performed, namely not before the first allocation needed to be freed. In the fuzzer sample that led toe1d7d4bd13, the call to av_image_check_size() failed and before said commit, the context contained lots of pointers from the src context, leading to assert violations lateron. Of course, the proper fix for this is resetting the pointers (or even better, not copying them in the first place), so this zeroing is unnecessary since commitb160fc290c. It is also harmful, because it makes initializing something only once during init more complicated; See the h264chroma handling in the diff for an example. Therefore it is removed. 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.