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The mapping of streams to the various variant streams to be created by the HLS muxer is roughly as follows: Space and tab separate variant stream group maps while the entries in each variant stream group map are separated by ','. The parsing process of each variant stream group proceeded as follows: At first the number of occurences of "a:", "v:" and "s:" in each variant stream group is calculated so that one can can allocate an array of streams with this number of entries. Then each entry is checked and the check for stream numbers was deficient: It did check that there is a number beginning after the ":", but it did not check that the number extends until the next "," (or until the end). This means that an invalid variant stream group like v:0_v:1 will not be rejected; the problem is that the variant stream in this example is supposed to have two streams associated with it (because it contains two "v:"), yet only one stream is actually associated with it (because there is no ',' to start a second stream specifier). This discrepancy led to segfaults (null pointer dereferencing) in the rest of the code (when the nonexistent second stream associated to the variant stream was inspected). Furthermore, this commit also removes an instance of using atoi() whose behaviour on a range error is undefined. Fixes ticket #8652. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.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.