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instead of calling the write_header/packet/trailer functions directly via the function pointers. Also, use distinct AVStreams for the child AVFormatContext (up until now the two AVFormatContexts shared their AVStreams because allocating their own was deemed too onerous). Using the function pointers directly meant that the Matroska muxer's init-function was never called, because init-functions were only introduced a few months after webm_chunk has been added and no one thought of/bothered to adapt webm_chunk for this (when the init-function was added in b287d7ea, the code setting the timebase was moved to it, so that the timebases were no longer set to ms-precision when using the webm_chunk muxer; this has been fixed after some time in 42a635dd by setting the timebases direcly (instead of calling the init-function)). And when 982a98a0 added a deinit-function for the Matroska muxer, it introduced memleaks in webm_chunk, because the child muxer's internal structures were no longer freed when calling write_trailer directly. (Given that the init function has never ever been called, the child muxer has never ever been properly initialized, so that the deinit-function was not called when freeing the child context.) This commit stops calling the function pointers directly and instead uses the standard API functions for muxers. This fixes the above mentioned memleaks. (Memleaks are still possible on error. This will be fixed in a future commit that adds a deinit-function to webm_chunk itself.) 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.