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Custom .cu kernels компилируются через ffbuild → .ptx, embedded в binary через bin2c pattern (как vf_scale_cuda). Loading через ff_cuda_load_module в config_output, kernel handles cached на life-of-filter. Kernels: Alpha_Fill_Y/UV — solid colour α-blend (rect, dim, border strips) Alpha_Blit_RGBA_Y/UV — blit RGBA atlas → NV12 (text/icon в 4b-3/4) Render side: render_strip_alpha — заменил render_strip_solid (alpha=255 ≡ solid) render_overlay_rect — opacity передаётся в kernel render_overlay_dim — Y=16/UV=neutral × dim.amount (затемнение region) Также: убран unused cuda_grid_config_input (-Werror), добавлены fields CUmodule + 4×CUfunction в Context; unload в uninit. cuMemsetD2D* НЕ доступны в FFmpeg's CudaFunctions wrapper, поэтому solid fill реализован через kernel — лишний overhead minimal (16×16 threads). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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.