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Lynne
87e780662b
Since the decoder gained an update_thread_context() for the hwaccel pixel format handoff, the framework no longer calls ff_thread_finish_setup() on its behalf, and the decoder never called it itself, so every frame thread waited for the previous frame to be fully decoded before starting. With no slice threading to fall back on, the decoder ran on one core whatever the thread count. Signal the end of the setup once the frame buffer and the hwaccel private data are allocated. Decoding a 3840x2160 10-bit sequence goes from no speedup at all to 1.5x on 12 threads, bound by the memory bandwidth of the unpacking, with identical output.
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 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.