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There can be more than one SeekHead in a Matroska file, but most of the other level 1 elements can only occur once.* Therefore the Matroska demuxer only allows one entry per ID in its internal list of level 1 elements known to it; the only exception to this are SeekHeads. The only exception to this are SeekHeads: When one is encountered (either directly or in the list of entries read from SeekHeads), a new entry in the list of known level-1 elements is always added, even when this entry is actually already known. This leads to lots of seeks in case of circular SeekHeads: Each time a SeekHead is parsed, a new entry for a SeekHead will be added to the list of entries read from SeekHeads. The exception for SeekHeads mentioned above now implies that this SeekHead will always appear new and unparsed and parsing will be attempted. This continued until the list of known level-1 elements is full. Fixing this is pretty simple: Don't add a new entry for a SeekHead if its position matches the position of an already known SeekHead. *: Actually, there can be multiple Tags and several other level 1 elements are "identically recurring" which means they may be resent multiple times, but each instance must be absolutely identical to the previous. 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.