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The earlier code had three flaws: 1. The case of an unknown-sized element inside a finite-sized element (which is against the specifications) was not caught. 2. The error message wasn't helpful: It compared the length of the child with the offset of the end of the parent and claimed that the first exceeds the latter, although that is not necessarily true. 3. Unknown-sized elements that are not parsed can't be skipped. Given that according to the Matroska specifications only the segment and the clusters can be of unknown-size, this is handled by not allowing any other units to have infinite size whereas the earlier code would seek back by 1 byte upon encountering an infinite-size element that ought to be skipped. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@googlemail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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.