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183132872amade the iff demuxer output extradata and made the decoder parse said extradata. To make this extradata extensible, it came with its own internal length field (containing the offset of the palette at the end of the extradata). Furthermore, in order to support mid-stream extradata changes, the packets returned by the demuxer also have such a length field (containing the offset of the actual packet data). Therefore the packet parsing the extradata accepted its input from both AVPackets as well as from ordinary extradata. Yet the demuxer never made use of this "feature": The packet's length field always indicated that the packet data starts immediately after the length field. Later, commitcb928fc448stopped appending the length field to the packets' data; of course, it also stopped searching for extradata in this data. Instead it added code to parse the packet's header to the function that parses extradata. This made this function consist of two disjoint parts, one of which is only reachable if this function is called from init (when parsing extradata) and one of which is reachable when parsing packet headers. Therefore this commit splits this function into two. 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.