cb592ae95f
Up until now, the WebM variant of WebVTT subtitles has been handled specially: It had its own function to write it, because the data had to be reformatted before writing. But given that other codecs also need reformatting, this is no good reason to also duplicate the generic stuff for writing Block(Group)s. This commit therefore uses an ordinary reformatting function for this task; writing WebVTT subtitles now uses the generic code and therefore automatically uses the least amount of bytes for its BlockGroup length fields whereas the earlier code used an overestimation for the length of the Duration element. This is the reason for the changes to the webm-webvtt-remux FATE-test. (This commit does not implement support for Matroska's way of muxing WebVTT; it also does not add checks to ensure that WebM-style subtitles don't get muxed in Matroska. But the function for reformatting gets a webm prefix to indicate that this is for WebM.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.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 means to alter decoded audio and video through a directed graph of connected 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.