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The grayscale, optical flow and interpolation stages are currently serialised with host fence waits (ff_vk_exec_wait) after each of the the grayscale and optical flow submissions. We can remove these waits and manage everything with timeline semaphores. In particular, we must correctly handle the case where more than one frame is being interpolated per optical flow pair. In these situations, we have multiple interpolations waiting on the optical flow generation, and then we have the next optical flow generation waiting on all the previous interpolations. This requires the ff_vk_exec_add_dep_signal_sem() we added in the previous commit. We also introduce a second context to the optical flow exec pool so that the next command buffer can be recorded without a host-wait for the previous one to retire - but of course, optical flow is serial so the queued one won't actually execute until the previous one completes.
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.