mirror of https://git.ffmpeg.org/ffmpeg.git
04b62bd7ce
1. Up until now, the error message for EBML numbers whose length exceeds the limits imposed upon them because of the element's type did not distinguish between known-length and unknown-length elements. As a consequence, the numerical value of the define constant EBML_UNKNOWN_LENGTH was emitted as part of the error message which is of course not appropriate. This commit changes this by adding error messages designed for unknown-length elements. 2. We impose some (arbitrary) sanity checks on the lengths of certain element types; these checks were conducted before the checks depending on whether the element exceeds its containing master element. Now the order has been reversed, because a failure at the (formerly) latter check implies that the file is truly erroneous and not only fails our arbitrary length limit. Moreover, this increases the informativeness of the error messages. 3. Furthermore, the error message in general has been changed by replacing the type of the element (something internal to this demuxer and therefore suitable as debug output at best, not as an error message intended for ordinary users) with the element ID. The element's position has been added, too. 4. Finally, the length limit for EBML_NONE elements has been changed so that all unknown-length elements of EBML_NONE-type trigger an error. This is done because unknown-length elements can't be skipped and need to be parsed, but there is no syntax to parse available for EBML_NONE elements. This is done in preparation for a further patch which allows more unknown-length elements than just clusters and segments. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> |
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|---|---|---|
| compat | ||
| doc | ||
| ffbuild | ||
| fftools | ||
| libavcodec | ||
| libavdevice | ||
| libavfilter | ||
| libavformat | ||
| libavresample | ||
| libavutil | ||
| libpostproc | ||
| libswresample | ||
| libswscale | ||
| presets | ||
| tests | ||
| tools | ||
| .gitattributes | ||
| .gitignore | ||
| .travis.yml | ||
| CONTRIBUTING.md | ||
| COPYING.GPLv2 | ||
| COPYING.GPLv3 | ||
| COPYING.LGPLv2.1 | ||
| COPYING.LGPLv3 | ||
| CREDITS | ||
| Changelog | ||
| INSTALL.md | ||
| LICENSE.md | ||
| MAINTAINERS | ||
| Makefile | ||
| README.md | ||
| RELEASE | ||
| configure | ||
README.md
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.