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We have to write an explicit BlockDuration element (and use a BlockGroup instead of a SimpleBlock) in case the Track has a DefaultDuration that is inconsistent with the duration of the packet. The matroska-h264-remux test uses a file with coded fields where the duration of a Block is the duration of a field, not of a frame, therefore this patch writes said BlockDuration elements. (When using a BlockGroup, one has to add ReferenceBlock elements to distinguish keyframes from non-keyframes. Unfortunately, the AV1 codec mapping [1] requires us to reference all references and to really use the real references, which requires a lot of effort for basically no gain. When BlockGroups are used with AV1, the created files are most likely invalid, both before and after this patch, but this patch makes this more likely to happen.) [1]: https://github.com/ietf-wg-cellar/matroska-specification/blob/master/codec/av1.md Reviewed-by: James Almer <jamrial@gmail.com> 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.