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This patch populates the third entry for HLS codec attribute using the AAC profile. The HLS specifications[1] require this value to be the Object Type ID as referred to in table 1.3 of ISO/IEC 14496-3:2009[2]. The numerical constants in the code refer to these OTIs minus one, as documented in commit 372597e[3], confirmed by comparing the values in the code with the values in the table mentioned above. Links: 1: https://datatracker.ietf.org/doc/html/rfc6381#section-3.3 2: https://csclub.uwaterloo.ca/~ehashman/ISO14496-3-2009.pdf 3:372597e538Changes in this version: - Default value set to "mp4a.40.2" when profile is unknown for backward compatibility. Signed-off-by: Steven Liu <liuqi05@kuaishou.com> (cherry picked from commit797f0b27c1) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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.