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At present, if the outer stream extradata is empty but first packet has extradata as a side data element, then only the first segment's muxer instance may be able to extract this side data and use it. For all other segments, extradata in packet side data could be missing and generated segments may be invalid or unplayable in some apps e.g. for an ADTS AAC stream segmented to MP4, the adtstoasc BSF will add extradata to the first packet. The MOV muxer for the first segment will add this to codecpar for the inner stream and write Decoder Specific Information within the esds box. For other segments, their esds' will not have this decSpecificInfo and they can't be opened in Quicktime player or by services like nginx-vod-module.
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.