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Martin Mirchev
6dba2558c0
The lookup of the stream group for each IAMF audio element compared only the group id and kept the last match. Mix presentation groups are created after the audio element groups and use the mix_presentation_id as their id, so if a mix_presentation_id equals an audio_element_id the mix presentation group was picked instead. Its entries are the streams of every audio element, so the same output stream got its index entries filled twice and the av_assert0(!out_sti->index_entries) aborted. Such files are written by FFmpeg's own mp4 muxer, e.g. with two audio elements with ids 1 and 2 and a mix presentation with id 1. Also check the group type. Keep using the last match: audio element ids are only unique within one IAMF track, and the groups of the current track were just appended, so the last match is the audio element of the current track even if an earlier track uses the same id. Signed-off-by: Martin Mirchev <mmirchev@comp.nus.edu.sg>
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 Forgejo or 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.
See https://ffmpeg.org/developer.html for more information.