4ed3c925c3
Up until now, SeekEntries were already added before start_ebml_master_crc32() was even called and before we were actually sure that we really write the element the SeekHead references: After all, we might also error out later; and given that the allocations implicit in dynamic buffers should be checked, end_ebml_master_crc32() will eventually have to return errors itself, so that it is the right place to add SeekHead entries. The earlier behaviour is of course a remnant of the time in which start_ebml_master_crc32() really did output something, so that the position before start_ebml_master_crc32() needed to be recorded. Erroring out later is also not as dangerous as it seems because in this case no SeekHead will be written (if it happened when writing the header, the whole muxing process would abort; if it happened when writing the trailer (when writing chapters not available initially), writing the trailer would be aborted and no SeekHead containing the bogus chapter entry would be written). This commit does not change the way the SeekEntries are added for those elements that are output preliminarily; this is so because the SeekHead is written before those elements are finally output and doing it otherwise would increase the amount of seeks. 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.