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9102a90a95
This reverts commit 1c17061397.
The commit intended to provide certain codecs using *_mp4toannexb
bitstream filters with updated (annex B) extradata (even when
the user-supplied one was ISOBMFF), yet BSFs are allowed to change
way more. The media100_to_mjpegb BSF used by the media100 decoder
changes the codec id; the commit being reverted therefore changed
AVCodecContext.codec_id which is an API violation and broke
media100 decoding with the FFmpeg cli tool.
This commit also made changes from the internal BSF externally
visible. extradata is documented to be "owned by the codec and
freed in avcodec_free_context()" which does not include replacing
it with something else in avcodec_open2() and may surprise users
who think that AVCodecContext.extradata is immutable before
avcodec_free_context(). It also incurred a memdup which is completely
unnecessary for most decoders.
Therefore this commit is reverted. The problem it tried to solve
will be solved differently in the next commit.
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.