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The sidechaingate filter wants its main input and its (only) output to have the same channel layout and number of channels; yet it does not link them in its query_formats callback. Instead it sets the outlink to only accept the first offered choice for the main input's channel layout and then sets both inputs to independently accept any channel counts. The config_output callback then overwrote the outlink's channel layout and channels properties with the main input's, even though they may differ in case the first offered choice for the main input's channel layout turns out not to be the final one. Consider e.g. the following filtergraph: [in]aformat=channel_layouts=mono,aformat=channel_layouts=stereo|mono[out];\ [out][in2]sidechaingate,stereotools The two aformats ensure that the first offered channel layout (stereo) will not be chosen for the input; yet it is the only offered channel layout for the output of sidechaingate and will therefore be chosen by the query_formats framework. Because the sidechaingate outputs interleaved doubles which stereotools expects the output of sidechaingate appears to be suitable as input for stereotools without further conversions. Yet stereotools actually only receives a mono frame and therefore overreads its input buffer which leads to segfaults; it can also lead to heap corruption because there can be writes beyond the end of the buffer, too. Fix this by linking the channel layouts of the main input and the output in query_formats and remove the code overwriting it in config_output. Reviewed-by: Paul B Mahol <onemda@gmail.com> 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 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.