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This is mapped to the faststart flag (which in this case perhaps should be called "shift and write index at the start of the file"), which for fragmented files will write a sidx index at the start. When segmenting DASH into files, there's usually one sidx at the start of each segment (although it's not clear to me whether that actually is necessary). When storing all of it in one file, the MPD doesn't necessarily need to describe the individual segments, but the offsets of the fragments can be fetched from one large sidx atom at the start of the file. This allows creating files for the DASH ISO BMFF on-demand profile. Signed-off-by: Martin Storsjö <martin@martin.st>
Libav
Libav 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.libavresampleimplements audio mixing and resampling routines.libswscaleimplements color conversion and scaling routines.
Tools
- avconv is a command line toolbox to manipulate, convert and stream multimedia content.
- avplay is a minimalistic multimedia player.
- avprobe is a simple analisys 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
Conding examples are available in the doc/example directory.
License
Libav codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.