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These filters do not directly know whether the API they are using will support dynamic frame pools, so this is somewhat tricky. If the user sets extra_hw_frames, we assume that they are aware of the problem and set a fixed size based on that. If not, most cases use dynamic sizing just like they did previously. The hardware-reverse-mapping case for hwmap previously had a large fixed size (64) here, primarily as a hack for QSV use - this is removed and extra_hw_frames will need to be set for QSV to work since it requires fixed-size pools (as the other cases do, and which didn't work before).
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.